My buddy recently bought a brand new QSC RMX 1850HD to power a couple of Carvin TR1801 subs. The other night I helped him set the stuff up. I ran the amp bridged mono into both of the subs for a total of 4 ohms impedance. I cranked the amp until the clip lights would flash occassionally. Needless to say there was some thumping going on. Everything seemed fine so I left everything the way it was. Half way through the gig I looked at the amp again, and the clip lights weren't "in sync" any more. The channel 2 signal indicator was working, but the clip light would only come on maybe half the time the channel 1 clip light came on. Everything sounded fine so I didn't think much of it, but is this abnormal?