We've noticed that in a few places that we play regular that we are experiencing some power droops. It's not manifesting as tripped breakers but rather as muddiness in the system and even our Aux sends would get garbagey sounding. This would happen when we were all playing hard and loud. When we would lighten up for a verse or something... things would clean right up. We've only got a basic amount of power conditioning happening... (couple of rack mount furman units... one for the mixer/crossover/eqs and one for the power amps.) Seems that the Mixer (Presonus SL 24.4.2) and the Sub Amp (Crown XTi 6002) (we also have a Crown k2 powering the mains) are the main things that are being affected... and I have read that the PreSonus SL series are a little sensitive to crappy power... We are currently looking at a Furman P-1800 PF Power Conditioner... http://www.musiciansfriend.com/accessories/furman-p-1800-pf-power-conditioner/182057000000000 Would this be a proper sized unit to help solidify the power for the PA? Any other suggestions?