I'm normally in the Amp Section of TalkBass, but I need some assistance with my basses. I need to change out my onboard preamp since it is not working properly on my Corvette. I've isolated the problem back to the onboard preamp so it is perfect for me to try a new preamp and upgrade it to a 3 band or 4 band instead of Warwick's usual 2 band. I've tested a couple OBP's such as the -Mike Pope 4 band (Loved it), -Aguilar OBP-3 band (Did NOT like the mid selector), -Audere Pro Z 3 band (Loved the treble -how it was not so hot or harsh when pushed). I have 2 different Warwicks - -Thumb BO 6 string with 2 band EQ (This bass is awesome and don't care too much about changing the OnBoard Pre unless something really persuades me), -Corvette $$ 4 string 2 band EQ. It has the bad preamp and I'm looking for a Pre that will have a 4 band EQ and can still work with both the MEC $$ Double Humbuckers with switches (Parallel, Split, Series).