Picked up a Genz-Benz Shuttle 6.0 recently after being wowed in local music store. Used it at rehearsal once, with great results, then on to gig last night. It replaced a borrowed Beringer Ultrabass 300. Speakers are 2 JBL 15's in Bag End cab. To me, the Shuttle sounded great on stage - cleaner and tighter than the Beringer. During the break between sets, a local musician said the bass sounded thinner and asked if I had changed anything. I told him it was the amp, and he suggested I go back to the Ultrabass! I asked the soundman how the bass sounded, and he said good, though he did have a weak signal from the direct out. I noticed that the switch was set to mic instead of line. I wonder if that was the deal? Should it be set on line? The soundman was also micing one of my 15's so he should have had enough to work with regardless. I'd appreciate any input - I have the amp on a grace period and would like to resolve things soon. Thanks.