Wanted to take a moment to thank Bob Lee of QSC for responding to and answering questions here at Talk Bass. Your suggestion to crank up the preamp and turn down the amp is well taken (ref. QSC thread below). As a 2402PLX owner I'm very satisfied with this 21lb unit with the exception of the mechanical Ghost Buster's siren like sound comming from either the fan or the power supply. I'm realy nit picking here. If I had a choice between the noise or an increase in weight, I'll take the noise thank you. Again thanks for taking the time and thanks to your company for offering an affordable light weight product to all of us roadie challanged players who prefer amp/preamp combos.