We usually run a relatively small PA -- 2 JBL 1x10 powered mains and a 15" Mackie powered sub. It's ok for most venues we play but the lows are a little lacking. The sub died last night (very odd, you can still hear it working, just very quietly) and my singer is fed up w/ running power cables so he wants buy a traditional non-powered PA. I have 2 big older 1x15 sub bins w/ JBLs and a Mackie 1400i to power them that we will use to cover the lows. What mains and amp should he buy? Nothing too big. He's looking at a Carvin amp w/ 4 channels at 1000W each. It's heavy. Anybody use one of those? Should he look into other amps?