Umm. It's gone. Back to Carvin first thing tomorrow morning. Why?
If you haven't been following my OTHER GAS attack, cause I bought a BX600!
here's the reasoning that made me pack it back up:
Build Quality: I found the knobs and switches on the BX500 to feel a bit on the cheap side. My first impression handling the amp was that it felt like a toy, and not only because of the light weight. The knobs felt like they would break off while the BX600's metal knobs feel robust and more exact.
Sound Quality: Using the BRX 2.10, I found the BX600 has more inherent bottom end than the 500. Also, the drive knob actually muddies up the sound a bit, something which the 500 just doesn't do. For a rock band, the 600 has the grittier, harder hitting sound that the 500 just doesn't give you. While the 500 has a very clear, flat, crisp sound that never gets dirty, the 600 can grasp that clean sound and get heavy.
Features: This is the only thing I had trouble with. The 500 has just about every feature imaginable. Tube Pre, DI, EFX loop, tuner out, 2x Speakon, mute, active switch, the lot. The 600 has a few less features but I feel it has the better of them. I really enjoy the option of selecting pre/post EQ for the DI, a feature the 500 sorely lacks (DI is only Pre-EQ). I would have liked a speakon jack on the 600, but frankly, I'll live. (my new custom made speakon cable will be used for daisy-chaining.)
so, here's my advice for rock players looking for a carvin bass amp: Get the BX600 before they stop making it!