I have a Classe 30 (currently sitting in the box, because of upgrading), and I used the balanced and unbalanced out at the same time for several years -- balanced to drive the main power amp, and unbalanced to drive a powered subwoofer. I experienced no problems whatsoever, though eventually the upgrade bug bit. It is true that you will likely have an issue with balance between the amps, though, if neither has level controls. Another option, which I also used with the Classe 30, is to split the unbalanced output using y-connectors (I used some nice heavy goldplated ones sold for car audio); then both amps are getting the same signal. I'm sure the same thing would work with the balanced outs if you can find or make the appropriate y-adapters. Anyway, I agree that you won't hurt any of the gear by trying it. Good luck!