What bass do you use?
I had one ant I thought it sounded great. Very fat, deep, but with good definition.
I used a Jazz and a Stingray. The controls on the amp were left pretty much neutral...
TC RH450 #8, MM Stingray #153, EBMM SUB #15, Warwick #325, OLP #13, G&L #411, GENZ BENZ Shuttle 9.2, MARKBASS LMIII, BAREFACED and SCHROEDER cabs