A bloggery post about the the seriousness of science and figuring out what is important and while listening to the morning news, I hear:

Light Drinking Might Help Keep Women Slim

and they go on to give their findings of the 19,220 women studied and how a link is found between moderate drinking and not gaining weight. The study's author Dr. Lu Wang, an epidemiologist with the division of preventive medicine at Brigham & Women's Hospital in Boston states several possible reasons including:

"Among women, those who regularly consume light-to-moderate alcohol usually have a lower energy intake from non-alcohol sources. On the other hand, alcohol intake tends to induce increased energy expenditure beyond energy contents of the consumed alcohol in women. Taken together, regular alcohol consumption in light-to-moderate amount may lead to a net energy loss among women."

Hmmmm, Really? Oh my, what have they discovered? I wonder what kind of increased energy expenditure it could be? Perhaps that explains the plethora of 2am female joggers and crowded ladies night at fitness gyms after the bars close.

So while pondering scientific studies may as well dive back into unraveling more in the wonderful world of sound.

Hey, is anyone interested in an NL4 tester version of the Rat Sniffer? The prototype is done and it is a two ended tester that checks for every fault in NL4 cables. Like the Rat Sniffer, this is a field use product that allows you to test NL4 cables when the cable ends are located at a distance from each other.

These are high quality machined aluminum and based on the same patented circuit utilized in the Rat Sniffer testers and tests for every possible short, open and miss-wire ALL GREEN = CABLE IS GOOD. No on off switch to worry about and they use the same 12 volt replaceable remote key chain alarm battery as the Rat Sniffer as well.. I am trying to gauge how many to make on this first order so if you are interested let me know. I am going to make first production run of US made custom machined units priced at $120 per send receive pair plus a free rat shirt and serial numbered warranty card for helping me get these things rolling. Soon to follow will be an NL8 version an then a Cacom unit as well. Also, if you do buy them and don't love them, send them back and Rat will do a full refund.

**** Sound Nerd Speak ****

So I am watching this AES panel video on the perceptions hearing

http://www.audiodesignline.com/showArticle.jhtml?articleID=222700732

and as much as I agree with the discrediting of scammers, and the undermining of audio voodoo, I also prickle at the arrogance of assumptions. Especially when what starts out as a clear and believable scientific observation becomes blurred as opinions of perception leak in. I so agree with keeping things in perspective which of course involves first establishing a well grounded and valid viewpoint to start with.

Let me clarify perspectives. On one hand we have the perspective of believers, 'the anything is possible crowd,' where the sky is not the limit, possibilities are endless and whether the concepts are repeatable or provable is not near as important as the fact that they were written, thought or spoken. On the other side we have the perspective of huddling skeptics, the self proclaimed 'investigators of verifiable proof' building the world of science, based on identifying dependable repeatable concepts from which real-world functioning successes can be built.

Both the believers and the skeptics inspire massive rivers of money flowing to support their respective causes. Both construct items of perceived value and usefulness. Both sell or pass freely their thoughts and revelations to attract others to swallow and follow. Whether it is a crystal that heals, an automobile that transports or a process of thought that helps one navigate one's life, they are both trains of thought with long and twisted histories peppered with successes and misconceptions over the years. Due to their differences in perspective, neither is able to truly resolve the expertise of the other. The pure skeptic can no more prove a certain type of music is beautiful than a pure believer can construct a cell phone that actually functions.

It is easy to to understand why science is useful and easy to feel why adding the complexities of beauty and art improves our lives beyond the monotony of what is purely utilitarian.

So what is the problem?

It is the middle ground, that gray area between fact and recreation where science encounters discomfort. The things we purely feel or think we know that science has yet to be able to adequately encompass.

The credibility of science comes into question when we are told that something can't be heard yet we do hear something. In our own confusion when we believe we have taken every variable into account only to find the most remarkable surprises still remain. These false assumptions are the feeding ground for the tangled garden of ideas for believers in magic and mystery. The Skeptics are doing all they can to excavate and form clean rows of well organized thoughts while the Believers immerse in weaving fact and fiction into complex and intoxicating stories and patterns. And yet a third perspective exists wherein both viewpoints are viewed as desirable, sellable, marketable and therefore useful.

Regardless of the propagation of education, I will personally make the jump to the conclusion that our world will always contain some balance or ratio of Believers and Skeptics. It is impossible to live our lives without the rules of science, just as it is impossible to live without the influences or art, pleasure and those magical stories affecting our lives. So let me call the beliefs that have a low level of probability and are grounded in floating perceptions, 'art.' I will refer to the beliefs that have high degree of provability and therefore probability, 'science.' It is when one side denies the relevance, the importance and/or the necessity of the other that voids are created allowing pseudo-science and other forms blurred perspective to gain traction. When art attacks science or visa-versa it just undermines it's own integrity. To tell an amazing story is one thing, to claim it is true is another. To measure the various nuances in sound is one thing, to claim it can or can not be heard is another.

So just as I laugh at the absurdity that people actually buy colored stones to tape to their audio cables in ignorance of the astronomical improbability that there will be any form of realizable alteration of the sound, I also believe that it is the failure of the science world to embrace the unknown that allows this ignorance to fester. And yes, science does try to quantify the importance and realities of art, and the world of art-thought tries to encompass science as well. Science teaches us that there are things that are known and things that are not yet known. Art teaches us there are things we 'know' and feel that defy definition.

We feel, yet science is typically by nature methodical and cold. The attractions to the warmth of mystery inspires the desire to circumvent being characterized and labeled as a predictable reproducing food eater. We know in our minds that we see, feel and hear so much more than even the most complex analysis system seems account for. Science's downplay of the cumbersome and its inability to adequately explain everything leaves the door ajar for people that will believe anything. Not that they wouldn't grab bit or real info, twist and run with it anyway

So anyway, back to the video. I am watching and enjoying the clarifications on human perceptions yet as and as the video progresses to the "what we can and can not hear" I find myself feeling swindled a bit and tempted to jump to conclusions and thinking that if the power of suggestion can inspire us to hear things that are not there, would not the opposite also be true? As the various sounds are played, are we convincing ourselves we can't hear them? What about cumulative effects of several independently inaudible aspects combining? Just as it is important not to jump to the assumption I can hear something, it is equally important not to jump write off something as audible or relevant without doing due diligence. In the end though, and in defence of the demo, a clear point was repetitively made; "this is just to help keep things in perspective" and with that I concur.

And with that lets take a big huge step back and ask ourselves "What would this accurate audio reproduction sound like if perfected?" How can we determine what is or is not important for audio accuracy if we have yet to create audio accuracy? Whether $10,000 audio cables are used or 192K converters and razor flat mics, the real story is that at the end of the day has anyone ever heard a recording played back where you tried to search around the room to find where the live band was hiding? How come we can know there is a garage band rehearsing a block away and when you sit dead center in front of the best sound systems money can buy and close your eyes, the best we can get is a descriptive range of similarities to live?

What if one side or the other was truly able to prove their position? What if those pricey cable companies with colored rocks put together a system that when turned on, you would swear up and down that there are actual musicians in the room. Would it sell systems? Would it sell cables? If they could do it do you think they would? Would that not be a game changer? Then they could show that vinyl is more realistic than CD's, or that it no longer sounded exactly real without the faster D to A converters or fancy power cords. The room would not matter, just as the room does not matter with that garage band. "Oh, you were playing live in a crappy room so I thought you were a recording" Yeah, right.. Has anyone ever heard sound reproduction so clear that you were unable to tell it was not in real time? I haven't but when and if I do, it may be a good place to start testing truly whether some of these products and concepts actually function.

**** End Sound Nerd Speak ****

Oh, check out these pages

Play this auditory illusion over and over and it should sound like it keep rising in tone:

http://www.moillusions.com/wp-content/uploads/2006/05/shepards.mp3

And some more illusions and an interview with Poppy Crum who rocked one of the more fun presentations and clearly has one of the the coolest names ever!

http://www.cogito.org/interviews/InterviewsDetail.aspx?ContentID=17862

A bit more about James "JJ" Johnston:

http://home.comcast.net/~retired_old_jj/

And Ethan Winer

http://www.ethanwiner.com/audiophoolery.html

And finally in my long winded word wanders it looks like Coachella adventure is coming up quick. Oooooh big huge audio playground!

Dave Rat

Oh the joys of re realizing the same thing over and over again. I have the attention span of a windshield wiper. As if it is some great revelation I was out surfing this morning and pondering the less than thrilling weight of affairs of many of the projects in which I am immersed and then it dawns upon me. Heck, it is just winter darn it. I know this, I always know this, Winter is slow, sluggish resistive and lackluster for a touring rock n roll human, except for surfing and the snow sports. Anyway, I guess another way to look at it is I can feel the excitement of summer rock shows and general happiness looking and it makes me happy.

Occasionally in life we stumble across things that touch our hearts and bring us great concern. While driving home the other day I was shocked and dismayed to see this:

Yes, Share the Road! What the hell are they thinking? Road sharing is stupid. Oh wait, no, that's was not it. Oh that's right, it's the Unfree Tree! Truly a travestree. Caged and no longer free to roam and hunt it will surely starve to death. What crime could this tree have committed to deserve this? I don't know, but I do know that I had no choice other than to do what I am sure everyone of you is thinking right now. WE MUST HELP FREE THIS TREE!

So with the help of my daughters we started a Free the Tree page on Facebook. http://tinyurl.com/yz4j5nv Though we have no idea how it will help nor a plan or strategy whatsoever, if you feel so inspired, please join to help save the Unfree Tree!

**** Sound Nerd Speak ****

In case ya have not noticed, the cold, yes cold! it gets down to the low 50's here sometimes at night, weather has me spending more time indoors protected from those fierce elements. And what better to to do with some shacked up home time than to pull out the video camera and the power tool and spend some quality time undressing a few of the hottest wedge monitors on the market.

And if that is not enough, I had a great time playing Lego blocks with the new final production model EAW MicroSubs that arrived last week.

Hey, check out the mysterious ne L-Acoustics box called KARA

I guess the big debut is going to be at MusikMesse Frankfurt. Is what I see a mini K1 version as dV-Dosc is a mini V-Dosc? oooooh!

Ok, let me ask you this. How many of you know the difference between a 'Free Field' and a 'Random Incidence' measurement microphone?

http://tinyurl.com/yzql4wf

Ha, some tweaky stuff going on there! And to think that a cheap mic and an old sketchy RTA is more than enough resolution to easily weed out 90% of the headphones I tested.

I thought this was a quite credible and convincing test of doppler versus phase distortion that seemed to coincide with the simple testing I did http://www.youtube.com/watch?v=f-XPawd5unk

**** End Sound Nerd Speak ****

As much as I enjoy new adventures, it is just such a can o worms. So we have been looking for awhile to revamp the Rat Sound web site which is in dire need of a face lift. We actually have started the project twice with two different web designers and I guess a combination of cumbersome and bad luck have us still in limbo. So frustrated as I am I decide "hey, I will just catch up a bit on web site skills and dial in something till we can get her done right." Heck, just deciding what we want is a major challenge.

Anyway, so I buy a few books yesterday and dive into the sore eye screen stare while fumbling pages both paper and web. Wow, I don't know if I am happy stunned happy or just so lost in the ether world that it no longer matters. Either way, I have been using the daverat.com page as a test bed and there is some really cool stuff out there, though I am not sure I really know how a lot of it works.

What I think I know is that I was able to copy bits of code and embed my twitter site using a profile widget so that my last 4 tweets are shown. Using Feedburner's BuzzBoost I was able to embed this blog, and the Rat Sound Message Board such that the most recent posts are shown and automatically updated. I found that I could create a custom Youtube video player that auto updates and drop it into the page as well. 

If all works as precariously planned there is a bucket brigade of events all now interlinked where soon after I post this blog, feedburner will grab it and generate a tweet which should be grabbed by myspace and facebook updating my status as well as send off stuff to various unknown locations related to whatever those little check boxes I was having a party clicking upon. Why you wonder, or maybe that is me wondering. I can honestly say I do not really know other than the nerdiness of seeing if it all works. To spend massive amounts of time in order to save barely any. Or perhaps I just like opening big cans of worms just to see where they go.

And I am sure that all this is just elemental kids stuff but none the less, it bends my mind in knots and I am only on day 1 though not sure how long I will last. Oh I so crave the relaxing peaceful sensation of mixing a great big giant rock show.

The Mighty Headphone Quest

Is winding down as I settle in on three so far. I have a few more still coming in but for now the Denon AH-D5000 and Denon AH-D2000

are my favorites. Big, no folding expensive headphones that truly do sound impressive. Ha, isn't that just my luck, figures that the best headphones I can find are in the Denon consumer line that Rat Sound does not even have a dealership for. Oh well, I never would let that bias the testing anyway so it is actually kind of cool. In second slot and a bit more reasonably priced are the The Ultrasone HFI-680's

and they scored really high with clean HF, solid LF and they fold up as well. And darn it, Rat did not sell those either, but the folks at Ultrasone are super cool and we worked it out a to be an Ultrasone dealer now. The Shure SRH-840's came up well as well. Spare earmuffs, removable cable and foldable, they are a bit dark sounding but robustly built and solid.

I also did stumble across something I thought was interesting. If I turn up sound in one ear and leave the other ear off on some headphones I hear some sound in the ear that is of and in other headphones I do not. Furthermore, the sound I do hear, though low volume, it is not great sounding and tends to be distant and resonant. I hope to do a test and measure it. I am thinking possible factors are with whether they use 3 or 4 wires from the connector, wire length and wire thickness used in relation to driver impedance.

Ok, so what next. Oh, here is a video I put up a while ago and what is really whacky is if you look at the comments people leave me.

Ok, I am soooo curious to see if this whole posting thing works like a domino chain or a house of cards. Oh and if you have comments or suggestions, love to hear them!

Dave Rat

So I am listening to the news and all this hullabaloo about issues the instantly undrivable Toyota cars and as the story unravels it seems to be steering in the direction of two primary issues. First, there are cars that are doing something that the driver does not want, I.E. accelerating without being told to do so. The second issue arising is related to the cars not doing as they are in instructed, I.E. continuing forward when instructed to stop.

Now answer me this. We keep hearing reports that the acceleration issue is related to throttle linkage. Hmmm, does that make sense? How does a mechanical connection decide on its own to accelerate and tell the car to move faster? Hmmm. Now there are reports of a computer processor causing delayed braking on Prius models that actually do make sense and it is beginning to sound a bit familiar. Something about software and glitch and delay. Hmmmm, that has never happened before, oh wait, except everyday on just about everything computery I own. Could it be that cars are finally catching up to where our laptops have already gone and our digi live sound boards are deep into going? That wonderful digi ether world where our actions are analyzed and what actually occurs is some mathematical processed interpretation that we cross our fingers will actually occur in a timely manner? It is true that no longer does stepping on a gas pedal actually move a mechanical butterfly in a carburetor but instead initiates whole series of calculations and e-decisions which arrange a multitude of things in such a way as to hopefully inspire the car to move in a forwardly direction. Not unlike our new world of audio where the actual audio signals no longer need to even enter the knob and fader units we use to control them. Boot-up times and turning a knob results in stair steps of audible gradations after waiting that awkward fraction of a second for the console to get done calculating what it is you asked it to do.

Don't get me wrong, I love my laptop and rely on my cell phone with a smile. But would I use either of them to control the brakes or accelerator in my car? Perhaps I would but that would indeed add a new dynamic of cautious awareness to get my head around. And what about our non life and death world of audio? I must admit that as one who still is holding on to enjoying the fading world of analog mixing, I smile knowing that arbitrary acceleration and braking while awaiting a software update are two issues I do not have to worry about happening mid rock show.

Ok, enough useless but fun babbling, lets get on to the important stuff. There are so many concepts I have wanted to unravel and yet never had a method of documenting and demonstrating them that is enjoyable and easily shareable. In my latest video adventure I figured out a simple way to demonstrate the difference between pickup patterns of some popular vocal mics. I have been using om7's for years on artists that stay on top of the mic (sing with their lips against the mic grill). I have read and heard some pretty interesting and colorful opinions and comments on why one mic is better or worse than another but rarely are these opinions qualified with supporting facts. Also, recently I have spent some time and effort developing and manufacturing an adaptor to mate Audix mic capsules with Shure wireless transmitters. Why? Well, I made a video that answers that question.

Also, I have two more videos up from the Mighty Headphone Quest showing the low frequency volume testing on some of the cans. I have it narrowed down to three pairs so far but new headphones to test are still trickling in.

And oh, thank you Matt and Paul

for taking care of me at the Musicares gig.

I reluctantly forgive you for putting me on a PM5D because as much as I hate to admit it and find them no fun to mix on, it was the right tool for the job with so many bands, it just made sense to roll digi. It was only one song but it was also the first show with Chili Peppers rocking the new guitar player Josh. All good, this is going to be cool, cant wait till the show hits the road though it will be a while.

Finally for today, say hey to my new roommate Bones

Ok, off to ponder my next adventure.

DR

So my headphone testing continues and I actually think I am finding a few pairs that match or beat the Sony CD3000 reference pair. There are many inter-related factors to look at:

• Frequency Response
• Sound quality
• Maximum usable volume
• Isolation
• Fit
• Comfort
• Size
• Cost
• Cable type and length
• Construction quality
• Service-ability
• Any special features and on and on

I am going to do my best to eliminate any opinions and focus on the relevant measurable aspects. So first I started with flat response. Why? Well heck, if you have a pair of super wide response super low distortion headphones but half the frequencies are twice aloud as the others, what good will it do us?

"Oh yes, sir, oooh, you are in the business of accurately reproducing color images for huge crowds? Well take a look at this video projector, It is an amazing, high resolution and very accurate for everything except everything that is the color red will be twice a bright as anything color green and you can barely see blue at all." Crazy business!

So I believe that an even frequency response is the most obvious and basic of requests. I am testing testing with leniency and what I believe to be a sloppy spec of + or - 4 db from 30 to 12K. Furthermore, I do my best to get every pair to pass and whenever possible and give them the benefit of the doubt if they are even close. At this stage it is not about eliminating as much as it is about finding.

I realize my test methods lack many of the high tech perfectionistic angles and that is intentional. I don't know about you but I have personally read some pretty amazing claims about various pieces of audio gear and have seen many accurate and complex test setups constructed to reinforce claims stunning sound quality only to find out that the testing done is focused on a small aspects and offers an incomplete story of the big picture and real world experience. I have also read many profound and ludicrous claims of audio wizardry backed by false logic, pseudo science and blatant lies with no form of testing credibility.

My goal here is to side step both of the overly technical and voodoo magical angles by offering some simple logical and inexpensively repeatable testing that will hopefully allow people to draw useful conclusions as to what to expect from the various headphones.

So first I sought out flat response and thinned the pack a bit and now I am ready to move on to the phase 2 challenge. I am now going to subject all the headphones that meet or are close to the + or - 4 db spec to a low frequency volume test. My experience has been that it is very difficult for headphones to cleanly reproduce very low frequencies. Another issue I often run into is headphones that just do not have enough output and are incapable reaching adequate volume levels without distorting. I guess the question to be pondered is "What is an adequate volume level?" Well, I personally tend to mix around 103db to 105db A-weighted and and 110db to 112db C-weighted or flat weighted. Since I am looking for live sound headphones, I believe it is reasonable to expect the headphones I seek to reach actual show volumes. This way I can PFL the instruments at the same volume I expect to hear them when the PA is on and if they have a reasonable amount of isolation, I will be able to hear the headphones over the PA during the show.

Hmmm, a goal and a test setup. Ok, how about a tone generator on my laptop run into a power amplifier (BGW Model 85) into the headphone under test. Then a mic to measure the output of the headphones, an oscilloscope (HP 1715A) and an RTA (Klark Teknik DN60) to see the waveforms and use the other 1/2 of the power amp to power a speaker (an old Rogers Studio 1 BBC Studio monitor) so I can hear the waveform as well. Simple, easy and I can put it all together with stuff I have laying around the house here.

Here is what I am going to do:

#1) Send a 100 hz tone at a level of 110db flat weighted in the Sony CD3000 headphones. The volume level will be roughly determined by the RTA's overall level meter and the oscilloscope will show the peak to peak voltage. I will them match that peak to peak voltage for all the rest of the headphones I test. I have the oscilloscope set to .5 volts per division and 110db flat weighed shows up as 3 volts peak to peak (6 divisions on the scope screen).

#2) Without changing the voltage sent to the headphones, proceed to sequentially test with tones at 100, 90, 80, 70, 60, 50, 40, 30 and 20 hz while monitoring the output waveform on the oscilloscope and listening to the speaker. I will be looking for the 6db down point (1/2 peak to peak voltage) and note that as well as any strong distortions in the sound or waveform.

#3) Eliminate the headphones that perform poorly and while contemplating the next round of testing.

For the test setup, I have a mic fitted into a drilled hole in a piece of wood that I wedge against one muff of the headphones. I do my best to form a good seal and move the mic around till I get the best readings I can. To keep this blog post from getting crazy long, I am posting the most relevant waveforms rather than every single one.

Sony MDR-CD3000

Ok, here is a good looking 60hz waveform. 100, 90, 80 and 70 all look and sounds fine. There is a bit of sub harmonics showing up at 30 hz but the sub harmonics tend not to be too intrusive sound wise.

At 40 HZ it starts to drop in level a bit and it is begriming to deform a bit from a clean sine wave.

30 HZ is about the 6db down point and ignore the double traces. The waveform is clearly distorting and you can see the harmonic distortion causing 50 hz (4th from left) to rise on the RTA

and the 20 HZ is at about 1/3 the voltage and the waveform is fairly triangular. For visual consistency, I am not altering the sweep or range on the scope for any of the tests.

As you can see the waveform kind of falls apart but it did make it down to 30 with a reasonable amount of output.

So next lets take a look at the trusty and loved Sony MDR-V6. Since the V6's are pretty much the McDonalds burger of live sound headphones, I will post more read outs so there is a good comparative reference. The 100 hz looked good and here is 90 HZ which also is good but has a slight drop in level of a fraction of a db.

At 80hz we are seeing the waveform begin to distort and become a bit more triangled as the tops curve rightward a bit.

The waveform continues to degrade at 70hz and down from 3 volts to 2 volts PtoP.

And here is 60hz with a significant amount of harmonics showing up on the RTA and quite audible.

50Hz

30hz

and 20HZ

Hmmm, these waveforms are pretty warped as the V6's are not happy with these frequencies at these levels. The sharper the points on those waveforms, the more HF buzz and worse the sound is. Also, look at the RTA. Each tone should be a single or double LED column with the sides dropping off. When you see two peaks with a space between them, that represents harmonic distortion, If the second peak is below the primary, that is not too bad. But when the peak is above like the 40hz harmonic above the 20hz in the pic above, then it is really audible. We were seeing similar issues with the CD3000's as well but it started at a much lower frequency. I am going to cut the V6's out of contending for "The Best Live Headphones" but maybe for a good live headphone for under $100, they could be the way to go.

Ultrasone HFI 680

At 80 they look good

At 60 there is actually a boost of a few db

at 30 there is some triangulation and harmonic distortion at a 50hz but they are holding level quite well

I forgot to shoot the photo of 20HZ but it shows less than a volt down and some triangulation to the wave but nowhere near as severe as the V6's were at a much higher frequency. These continue to be one of the best headphones I have tested so far and they get to carry on to round three.

On the Sennheiser HD25-1 II's at 70hz, you can see they look pretty good. (ignore the double trace)

Here they are at 50hz, down a volt and not looking so good

but I found that some of these headphones are a lot more susceptible to low end variations due to the amount of squeeze against the test setup (or my head). I am sure you have all found that when you squeeze some headphones tight against your head the low end gets louder. Well the headbands on the HD25 are actually quite tight as well so I tested while squeezing the ear muff tighter and dropping the drive voltage level (the scope is on .2 volts per division for this pic,) and re calibrated for the extra volume and now look at 50

Here is 30 at normal pressure

30 at reduced level and more pressure, notice the cleaner sine wave.

And at 20Hz with normal test pressure and level they are just under 2 volts down.

Looking pretty good for over the ear headphones and surprisingly superior lows over the V6's yet not up to par with some of the others. Remember, these had a very flat frequency response so on to round three.

Wow, the Sony MDR-V600 already start to lose shape at 80hz,

Bouncing back in level at 60hz but still asymmetrical rounding on the top of the waveform

Degrading severely through 50 and 40 to a clearly clipped waveform at 30HZ

and I wont even bother showing you 20hz, say by bye to V600's.

Sennheiser MD280 PRO are looked pretty good at 80, But uh oh! Looks like they are not going to fair so well. Check out 70 hz!

But wait, they come back to life if I rest the back of them gently against anything that is rigid with some mass.

My finger does not work but barely touching this little amp or the wall snaps the response back to life. You can feel the slight flexing of the plastic as well when I send a tone to them.

Really strange, it appears the plastic housing is flexing and canceling out the low end. Here they are at 40 when scooted against that amp (ignore the double traces as it is just mis triggering on the old scope.)

and here they are moved and not touching at 40.

With a 3db down point at 20hz while resting against the amp

and a fairly clean sine wave as well, these will have to stay in the mix while I contemplate the whole "has to touch something" oddity.

The AKG K271 MkII headphones came in last week. One thing really cool about them is that they actually turn themselves off when you take them off your head. Very cool but drove me crazy trying to test them till I figured it out. They tested up quite well with frequency response on the RTA but rather than backtrack here, I am going to drop them straight into the low end level testing. Here they are at 100

With a bit of a peak at 70 HZ they came back to a pretty good level but some distortion at 50

progressively sloppy down to 30

and 20 is a mess. But, when I lowered the volume 10 db, they really cleaned up and come up quite nice all the way around. I am going to drop them from the top contenders while also recommending them as an awesome set of headphones for lower volume monitoring, especially if the auto off feature is an asset to your application. I will post the frequency response at some point as well.

So I had a pair of Shure SRH 840's and the demo ended before I was done testing and I sent them back. Of course I then get hit with so many requests to test them I have to reorder a pair. Here they are at 100

Getting a few db louder at 80

Still hot at 60 but fairly clean with a bit of sub harmonics rising.

Back to normal level at 50 and 40 and starting to drop at 30 and become more triangular.

With 20hz about 10 db down but reasonably well shaped compared to most

These are looking better than I expected and will have to see how they do on frequency response test.

Next up, the Denon AH D2000. Oh my. Check this out! Here they are at 70

Still holding strong at 50 with a nice sounding sine wave and some sub harmonics coming in at 30hz

A nice sine wave and no drop in level at 30hz yet harmonics at 50hz are up

Barely any level down at 20 and still a clean waveform!

and look! not even 3db down at 15 hz! (Yes, forgot to re label the pic from 20 to 15). These are so impressive I have just ordered a pair of the top of the line of that series, the Denon AH-D5000's that I will test for ya when they come in.

Ok, so that leaves us with five pairs plus the reference Sony CD3000's and the Beyer 770 and Denon D5000's that are on their way to me next week.:

As this test adventure progressed I have reinstated the Shure 840 as I never got a proper RTA reading on the first set that I had to send back when the demo ended.

I have found that I am getting better readings on the Sennheiser HD280 PRO's if I put some pressure on the outer shells so brought those back in the mix.

I wanted to continue testing the Equation Audio RP21 headphones with a removable cable and nice price point but for some reason they rushed me to get their demo pair back faster than I was able to put time into testing them for round 2. I don't think they would have made the "A" list but they do look like they have the potential to beat the V6's in the "under $100 street price" range.

I have been getting requests to test several other pairs from various manufacturers that I will gladly test if someone wants to send me a pair or if I can get some substantial credibility that any of those headphones have a strong chance of beating the top level cans I have already, I will consider purchasing for the test.

Will try and do a video in the next few days or so showing these the test methods and such so you can hear the top contenders as well. Here is a link to the video's so far. Cool cool, till next time rock on!

DR

It sure is tough to stay happy, healthy and also sane all at the same time. Surfing helps, audio nerdery helps, actually going to the market and buying edible food helps. And most recently I started running in mornings till it got all soggy out there. Three songs on a random play list till I make the U turn. I really love not knowing how far or long the run will be as I head to the mystery turning point yet to be determined. Some days are 20 minute jogs and some are 40 and it is a great pre surf way to start the day.

Ha! Though I did not find much gear wise at NAMM to get excited about, I did find Keith Morris!

Wow, has it really been over 30 years since I first met him with Black Flag rehearsing at the church in Hermosa. Yikes!

I have been doing my best to try and get my head around making some more youtube video's. There are so many concepts in the sound world that just do not translate when put into words and articles yet when demonstrated in a way that it can be seen and heard, it all comes together. So my goal is to come up with some simple clear demo's on various sound subjects and also try and debunk a few absurdities I see floating around.

I have spent an enormous amount of time over the past decade working on the MicroWedge series of monitors. There are a lot of wedges out there with various feature sets yet my experience indicates that most monitor wedge designs miss the most critical point. Monitors spend much of their working lives near open mics trying to get loud without feeding back. While monitor tuning can not be effectively eliminated with today's technology, I believe it is a huge asset to have wedges that actually get really loud and sound great right out of the box. So I have spent all this time and effort getting MicroWedges to to do exactly that and yet I really have had no way of easily demonstrating that advantage without personally doing side by side demo's next to other wedges. So what I did was get the today's best of the best, top requested world class monitors to compare: a D&B Audiotechnik M2 and an L-Acoustics 115XT HiQ and did my best to do an unbiased comparison demo video:

Also, in my quest for the best live sound headphones I keep running across some pretty interesting concepts and my curiousness inspires me to do a bit of credibility checking.

And if you are in the mood for a dabble into some babble and passionate claims of deep unsubstantiated knowledge - http://www.head-fi.org/forums/f4/how-bright-ultrasone-pro-900-a-396267/

Oh, and I am still seeking the ideal live sound headphones and will have another installment as soon as a few more pairs arrive. It is looking more like an ongoing adventure rather than a "find a winner" scenario. The V6, 7506's and Sennheiser HD280's are nice units but I am considering them to be the baseline ones to beat. The Sennheiser HD25II's and Sony MDR V600's both look quite good on the RTA but they just do not have the power and clarity I am getting out of the Ultrasone HFI-680's and Denon AH-D2000. But don't take my word on that, as I am pondering a way to test and demonstrate it rather than merely offering an opinion. So far I have been eliminating based on frequency response, which I believe to be a valid first step. Hey, if the phones can't reproduce all the frequencies at a relatively similar volume, can they really provide an accurate reference point? The tricky part now is to find a simple clear test that clearly demonstrates the sonic issues I am hearing.

Cool link of the day:

Thank you Maija. And the movie is produced by super cool surf friend, Takuji!

So as part of the Mighty Headphone Quest, I guess I am going to have the Mighty Headphone Sell Off.

I had to buy several pairs to get them tested and here are the first two and though they did not make the cut for the application I have outlined in this quest, they are still quite good and well loved headphones. A brand new till I opened them pair of Sony MDR-7509's and a brand new till I opened them pair of Grado SR60i open ear. If any bloggery friends buy them, we will toss in a Rat shirt and some stickers as well. They are up on ebay but just send us a note if ya win 'em and we'll hook you up.

Sony MDR-7509HD

Grado SR60i

Ok on to the more mundane. Simplicity, Complexity and Believability. I have been thinking a bit more as I try and hack away the cobwebs of complexity and I think I may be gaining some momentum. The desire to overcomplicate and mask clarity is irresistible, especially when it fills wallets. I do not believe it is tough, though. I believe when accomplishing the purest task is a formidable challenge, that to mask various levels of failure, distractions are introduced in order to overcomplicate something that is easily observed when left in it's simplest state.

So as I dig around in the vast diversity of products available. Each product is claiming to have some group of assets that are superior in some way to the asset group of the other products. Maybe one pair has a certain combination of is cheaper or lighter, more comfy, stylish, durable, louder, flexible, available, socially conscience in the manufacture or whatever and on and on and on and I know that the importance of sound really depends on the application intended, budget allotted and expectations that are set. But unlike price or weight or looks, sound quality opinions have somehow has taken on this supernatural aura that requires elite audio monks from the netherworld of golden ears and fuzzy logic. And ears golden as they may be, maybe, just maybe, at least, at minimum, if the sound that comes out is somewhat close to the sound that goes in, perhaps that may be a good place to start? And when I find perfect sound, I will know it. I will not need magic ears or special wires or voodoo crap of any sort at all. I will merely close my eyes and be completely unable to distinguish between where I am and whatever elsewhere the music has taken me. Everything else is just a feature or preference.

And does anyone know the model # of these Sony mystery headphones?

Dave Rat

So I have been working on a few new projects, one is an Audix to Shure Adapter that allows an Audix wireless mic capsule to mount onto a Shure wireless transmitter. The concept originated from our friend George Squires that mixes monitors for REM. Though Audix makes a wireless unit, it just is not of the caliber of the deep pockets Shure products. While Shure makes many very high quality mics, they just do not make a high gain before feedback mic that can keep up with the some of the Audix offerings. So, when you have a band that relies on the assets of an Audix mic yet needs wireless, it has been a bit of an issue. Switching to a different mic type mid show when the singer wants to wireless wander really sucks. So we made a couple prototypes for REM's last tour but they were just metal threaded adaptors and needed to be soldered to work. Now we have made a batch that just screws right on and allows any Audix capsule make a connection with any Shure transmitter. If you are interested, there is more info at http://www.ratsound.com/soundtools/

Okey Dokey Smokey. Plants not Animals!

Speaking of making connections and solutions, though I never mentioned it, for the past two years I have been battling a miserable on and off increasing bummer of a building sinus issue. It started pretty mellow and gradually built into headaches, blurry vision, light sensitivity and constant sleepless pressure that left me always tired and never fully coherent feeling. Five doctors, 2 MRI's and a Cat scan, antibiotics, a pile of natural based neti pot concoctions, cameras in the head, steroids, hot steam and on and on and on. That helpless unsolvable dredge of a feeling where everyday feels like rubbing bicycle brakes on an uphill pedal. Aaaargh! So once again I reach one of the many, "Hey, wait a minute, this is just not right, this is not normal, I must attack once again" points, calling the doctor, fed up I tell them I want to go the hospital or whatever this takes. So they give me an appointment right now and less than 30 minutes later I am in the his office hearing the same old rap. "Hmmm, yes, hmmm, ok, well I am going to prescribe blah blah blah." Hey wait, that's what you and every other doc has told me before but with no other immediate option I humor the response and whilst I try and form a new plan. But this time he says something different. "Hmmm, it's not bacterial, so antibiotics wont help, it's fungal based." Going to give you a seven day prescription that should clear it up. Oooooh, fungal is plant, and all this time everything has been focused on fighting little critters as bacteria is animal. Well new is good and worth a shot I guess, so I get to the pharmacy and they hand me these packets of huh? "For Vaginal Yeast Infections!" Yikes, that caught me off guard and sent me mind a wandering. I did a bit of research and found:

http://www.sciencedaily.com/releases/1999/09/990910080344.htm

That was 4 days ago and though I am not fully head pressure free, damn I feel a million times better like I no longer live my life walking around in a bowl of jello with spike in my cheek. I just hope it lasts but for now I am sure happier.

Lets see what else. The Mighty Headphone Quest continues and I have put up a few Youtube videos on the subject. You may notice a bit of difference in the readings as I have switched to a different microphone that is smaller and seem to read the HF a bit better on some headphones. It is interesting how some of the headphones are really sensitive to slight placement variations while others are not.

Hey, I have been getting requests to test some more headphone models which I will gladly do. But, since I do not have an unlimited budget on this and getting demo's can be tough with companies Rat is not a dealer for, I figured I would send a shot out:

If you have a pair of headphones you feel are worthy contenders and do not mind sending them to me for a 4 or 5 days, I will add them into the test mix and youtube the results. And thank you Bob Rice for the Sony MDR-7509 non HD's!

More audio nerdery! Hurray! Want a super cool free downloadable sine wave generator? Check out

http://www.tucows.com/preview/502787

Or how about a free version of Electri-Q' - posihfopit edition' is a simple, intuitive, but powerful minimum phase EQ?

http://www.aixcoustic.com/index.php/Electri-Q-posihfopit/30/0/

Or perhaps a parametric graphic equalizer with excellent response all the way up to Nyquist?

http://magnus.smartelectronix.com/#NyquistEq

And nothing like a trip to the beach with the pooch to bring a smile.

Dave Rat

Oh, and since not everything can always run smoothly and issues are bound to occur, please view the following instructional video teaching advanced troublshooting techniques.

And double oh, Greg Cameron sent me this link to a Pro Sound News article on Blink 182.

http://www.nxtbook.com/nxtbooks/newbay/prosound_200912/#/60