A guitarist friend of mine turned me on to this band called Black Cobra, in which a single guitarist splits his signal and runs through a guitar stack AND an ampeg stack. It really fills out the sound so they guitar is thrashing through both frequency spectrums. Do you guys know of any bands where a bassist does that? The only one I can think of is Lightning Bolt, but they aren't really "doomy". Long story short, recommend me some doom/sludge metal bands with 1 bassist and 1 drummer.