What you need:
1 Bass (since this is a bass forum =)
1 Patch cable (1' - 3')
1 Regular Instrument cable
1 Power strip
2 Bass amps
-Plug your bass into the amp that gets less use
-Crank up all the knobs (or just the volume and gain, and leave the tone knobs as is)
-Send the signal from the overdriven amp with the patch cable into the other amp
-The first amp plays the part of a distortion pedal
I don't have a bass pedal and put what I already have to use (I also heard this is what
the Kinks guitarist used to get his sound). But the sound I'm getting is closer to
Acid King
--I have yet to do this with two guitar amps, but a PA into Guitar Head
Does Not work (it could be cool for a section, but I wouldn't use that for a whole song... At least the combo I have isn't worth it). I have to get back my "practice" amp to see if that sounds decent.