I know what you mean about cold and sterile. I a/b'ed my SVT4 and my Markbass LMIII through my ampeg 6x10 at soundcheck last weekend and it was no contest. The LMIII was definitely the tone winner for me. So much easier to get a warm fat tone. And honestly, 500 watts was plenty through that cabinet to get the job done!
If it's a USA 4 pro I'll take that "cold and sterile" sounding bad boy off your hands.
It took me awhile to get the sound in my head with the amp, but once I dialed it in it sounded even better than I had imagined.