Here's my rig that I've had for years with no problem (signal chain is in order that is listed): -G&L L-2000 bass (new battery in pre) -Korg rackmount tuner -Tech21 Sansamp RBI preamp -QSC PLX 3002 (dip switches set to 4 ohm bridged) -Ampeg 410hlf cab (4ohm) Rig performs perfectly at my home and at the practice spot and has for years. 1. At a show, soundguy plugged a xlr into the direct out of the sansamp. Rig got really quiet and distorted after a little while of playing. Suffered through the show. Bass seemed to sound fine through the PA...I wasn't in the crowd but the cellphone recordings sound ok. 2. took rig back to practice after show...works just fine...loud and proud. Months go by.... 3. Recording at studio...engineer plugged into direct out of sansamp...worked ok for a little while then got quiet and distorted. Different cabs, though. Ampeg 115 and 410 both 8 ohm connected down to 4. Tried unplugging Direct XLR and I think we tried a direct box...still quiet and distorted. Rerecorded all tracks with different amp...What Da heck is going on? 4. Got home, set up rig...worked fine. 5. back at practice spot...works fine for months 6. Last night's show back at same club as before. Told sound guy to mic my cab....he gave me a direct box to plug into before my rig in the signal chain instead. Turned on rig and it's quiet and distorted again, but over the PA sound is good. Suffered through the show with only being able to hear the bass through the PA speakers...not through my cab. 7. Just now set up my rig in the garage...sounds fantastic. Super loud and clear. -------------------------------- Does anyone have ANY guesses on what is going on here?? From now on, I'll be I guess I'll be adamant about using a microphone for my cab. I'd really like to know what's happening, though. Maybe it's just the act of splitting the signal between a PA and the Preamp?