As the venue sizes increased, we began searching for a way to improve HF and UHF clarity in seats located in the far reaches of arenas and stadiums.  We often used a delay cluster to cover the seats all the way in the back, but more and more we were seeing venues that had areas that were required focused coverage at a relatively long distance off to the sides.  Our system naturally covered these hard to reach areas with mid and low frequencies and it seems to be considered acceptable by most touring productions to just write off the difficult to cover areas as "cheap seats."  The development of the Rat Horn Packs solved these issues in even the most difficult venues.  They are highly directional and work extremely well at covering areas greater than 500 ft away.  What we had not anticipated is that the Rat Horn Packs would work so well that they eliminated the need for delay clusters saved considerable time and truck space on our arena tours.