Posted by Sergio on February 03, 2002 at 14:27:41:
In Reply to: Re: question on your fighting for power article posted by Greg C. on February 02, 2002 at 18:34:39:
: Correct me if I'm wrong here, but it sounds like you're running a 2 Ohm load on those bridged amps? When you say daisy chained, are the 2 cabs on each amp series or parallel wired? If they're parallel, you risk a shutdown of the amp, or worse... Or like Dave is asking, are you really running bridged at the speaker outs, or dual mono mode...
: : Hello Sergio,
: : As far gaining the "extra power" as described in 'fighting for power', you need to do nothing. When you run an amp in bridged mode, you are already optimized as described in the article. The article deals with situations where the amp is run in stereo mode.
: : It sounds like you are running your system in the most powerful configuration given the equipment you have.
: : Just to check, in the setup you describe, you should not be using the black speaker terminals on the amps at all and the speakers should be hooked up accross the 2 red terminals. If that is how you have it wired, then you should be all good.
: : Dave Rat
: : : Hi, my name is Sergio, how are you guys? I read your article on "fighting for power", and I have a couple of questions that I hope you could answer for me.
: : : I'm running the low signal from my crossover to two qsc plx3402's(I'm using a 1ft xlr cable from input B of amp #1 to input A of amp #2 to make both amps run the same signal[lows]) For subs, I'm using four cabinets of the jbl sr-4719x(two 18" speakers per cabinet, which are rated at 1200 rms at 4ohms). I'm running two cabinets per amp, bridged. The way I have it hooked up is from amp to cabinet 1, then, from cabinet 1 to cabinet 2, I do a "daisy chain".
: : : Now that you have an idea of how I have my system hooked up(I hope is the right way!), my question is this...Since I'm running my amp bridged, do I need to switch the positive end of my cable going to the speaker to the negative of the speaker, and then the negative of my cable to the positive of the speaker? Or do I only need to switch the ends on my amp? Or switch the ends of my amp and the ends of my speaker?
: : : I'd really appreciate your help. Thank you.
Yes, I think I'm running them on a 2 ohm load(each cabinet is rated at 4ohms). And by "daisy chained", what I meant was that from cabinet 1's output to cabinet 2's input. I believe I am running my amps bridged. There's a switch in the back of the amps where it says "bridge on-off". So I just put it on the "on" position, and since I'm using speakon adaptors, the owner's manual says to plug into channel 1.
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