The only way to avoid this problem seems to be to cut the bass on my EQ to a super low level...this defeats my purpose of having a sub woofer. The only sound processing equipment I use is an EQ and I have been keeping the low end pretty light. Still had the problem when the EQ was by passed. As I mentioned in my first letter to you, when this thing works right I am extremely happy. It's just so unpredictable I find myself spending a lot of energy keeping an ear on the sub when I should be concentrating on my crowd.
As far as EQ'd signals are concerned, remember an EQ is just a gain control. When you boost one or more frequencies, you're boosting the signal gain. I would suggest that you do not boost any frequencies below 200Hz and just let the sub work on its own. Remember that turning up the volume on the sub is adding tons of bottom end to the overall sound. As you increase the output of the bottom end of the graphic EQ, you're really turning up the bottom end twice. The net result is more distortion, not more sound. As far as un-EQ'd signal is concerned, it's probably the same problem, just too much un-boosted signal. The gain control on that unit should probably not be set above 4 or 5 unless the input signal is weak. Above that setting with a strong signal, the limiter starts working.
The fundamental problem could be that you want more bass power than the unit can produce. An additional ES700P might do the trick or you might need to go to a big woofer and power amp. Try renting an additional ES700P and see how that works.
Phasing irregularities often causes problems of apparent "short throw" at low frequencies. Something as simple as the subs not sitting on the same horizontal plane or aiming in slightly different directions can result in phase-related losses of several dB. Of course if the subs have reverse polarity - i.e. they are 180 degrees out of phase due to messed up wiring - the losses are even higher. The trouble is, when you listen closely to a speaker which is out of phase with other similar speakers, whether acoustically or electrically, it sounds perfectly fine - lots of power and punch. The losses occur at a distance where those long, out-of-phase waves come together and cancel each other out. If you think this could be a problem, check everything out with an electrical phase tester for the subs' wiring and cables. Finally, make sure the subs are geographically aligned and close-coupled. You might not need new subs at all.
