5 varieties of orchestra musicians we use dsormais 2 EV sub122 subwoofer instead of a Yamaha. First point, we went from 2 x 45 kg 16 kg ... dj trs apprciable above 5 am! It should be noted that we do trs little "collection's outdoor" and will not have the opportunity to test them before June 2008 in this kind of configuration. We play in theaters for about 250/300 people with 2 amps Mackie M1400 (1 + HK Ramsa and 1 for 2 subs). The quality of sound from the move to sub122 EV is not comparable. The sound is round, clean, clean, less "fat", that's all done what we wanted, more like a hifi quality as a hard rock concert. Dtail little importance, the quality has significantly multiplies t since the acquisition of a compressor TC Electronic C300. In esprant that all these information give you a references.