Perhaps this post belongs in the Live Sound forum, and if so, I apologize. For the first few years of my bass-playing career, I always played through crap. Cheap basses, guitar heads, car subwoofers, etc. Because of this, I never really gave much thought to my sound. I knew it was going to suck whether it was going direct to the PA or not. I was usually happy simply to be heard at all. It's only been within the last few years that I've actually started playing decent instruments through dedicated bass equipment, and have started the endless quest for 'my tone'. I had never given much though to the pre/post EQ button on my Firebass head until a situation a few months back at a show. A little background. I play a Fender Jazz Plus V with active EMG's replacing the original Lace Sensors and Kubuki electronics. My head is a Peavey Firebass 700. My cabs are a janky Eminence 15" in a converted TNT combo, and a Hartke 115 XL. My effects are a Boss Bass Overdrive pedal on almost constantly to add the 'color' that the Peavey head lacks, a Boss Bass Synth for the occasional space-ship-type sound, and DOD Grunge (guitar) Grunge pedal for insane distortion here and there. My current band is best described as 'electro-punk'. Think Devo meets Black Flag meets Aphex Twin. Anyway, I've always kept the pre/post EQ button on my head set to post EQ for the direct output, and never bothered mic-ing the cabs because they sucked. Every sound guy would just plug into the direct out and move on...until a few months ago. At this show, the sound guy plugged into my output and then turned my post-EQ off. I politely insisted he keep it on (mainly because that's how I've always played) and we got into a little debate. Eventually I won out on the condition that I'd turn it off if it didn't sound good after the first song. It must have sounded fine because he never asked me to turn it off and even told me after the show that he was going to start considering letting other bass players leave their post-EQ on because mine sounded so good. Now, I've read the threads about this and gotten a good idea of everyone's opinions, but I'm still fuzzy on what the real facts are. What EXACTLY does this switch do, and why do so many people think it should be left off? If your amp and effects together make up a large part of your tone, shouldn't you be trying to feed that into the PA instead of just the instrument?