I own this little combo amp along with a Carvin 2x10 cab. My main bass is a Carvin Bromberg B24S with humbuckers. I really like this setup and under low volume, the tone is great. But when I crank the combo during rehearsals with live drums, it sounds pretty boxy and undefined. During live gigs with the additional 2x10, I get the volume but not the tone I dig. Between the BX500 head and the B24S preamp, theres a lot of knob noodling potential that I continue to experiment with but I cant consistently get an agreeable tone under loud volume. In addition, the tweeter in the combo cab buzzes like crazy when its barely half on. But if I dont turn on the tweeter, I get that boxy dull, thud-tone that Im not too fond of. I like having a relatively light combo amp with the power to be heard. I rather not pop out that head and slap it on top of a bigger, heavier cab. So I thought Id compromise and upgrade the 15 speaker and tweeter. My question is, does anyone think this will really help and also, what to get? Thanks!