I've got a used evilbay QSC PLX 3402 (1100W per channel) on the way to replace my Yamaha p5000s (750W per channel). The idea is that my headroom woes will be cured. Currently I'm running the Yamaha with a Kern IP777 going into that, then two Acme Low B2 2x10 four ohm cabs running out of the Yamaha. The Acmes are notoriously inefficient, and the 3402 should breathe some new life into the Kern and the Acmes. If not, I'll be very disappointed. The mint Yammy with orig box, packaging and manual will be listed below in the GFS forum before too long.