After hearing some talk about it on this board, I decided to try hooking my preamp to my poweramp through a balanced DI rather than a 1/4" output. My setup: Yamaha RBX765A bass Yamaha PB-1 preamp Yamaha gc2020 compressor Yamaha P2201 poweramp Aguilar gs112 cab (I will buy another one, I swear) normally I take a generic patch cable (I think it's unshielded, or at least I hope) and run it from the preamp's main output to a 1/4" input on the poweramp. This time, I took a Monster Prolink balanced mic cable from the pb-1's balanced XLR out to an XLR in on the poweramp (leaving the compressor out altogether.) My XLR is post EQ, volume and all. Result: It was a bit like playing through a whole different amp. My practice room has horrible wiring and fluorescent lights, and my amp almost always picks up obnoxious buzz that fluctuates depending on where I stand in the room. With the DI, the amp was dead silent except for the usual tweeter hiss. Earlier, my notes sounded muddy and indistinct, with a big hump in the lower midrange. With the DI, I seem to get a brighter and clearer sound. problems: since my poweramp has twin parallel xlr in/out jacks, I can still go direct through a PA at the same time as my rig. But with a DI, I can't run my preamp through the compressor. Anyone think I should plug it into the FX loop, or just go without it? Also, my biamp outputs are 1/4", and if I use the DI I can only go fullrange. Anyone else here use balanced XLR outs to go from their preamp to their poweramp? Any suggestions on how to use crossovers, compressors, FX, etc. in this sort of rig without picking up a lot of noise through unbalanced connections?