Some of the Classe's are balanced, including the CAM 350 and 400 along with the Omega series. Monoblocks are more likely to be differential because they're often adapted from stereo versions. The Plinius SA series can be bridged to a differential monoblock (about 4X the power) with a turn of a knob and a couple hook-up changes.
Bryston refers to a balanced output for the monoblock 7B's and since a 14B is claimed to be dual 7B's in one chasis, we might assume that as well. I have not read any claims to a fully differential design which seems a bit odd for a product with such pro/commercial usage. The input impedance is quite different for the XLR inputs but that isn't any kind of proof and it's certainly not the 600 ohm "pro standard".
Bryston refers to a balanced output for the monoblock 7B's and since a 14B is claimed to be dual 7B's in one chasis, we might assume that as well. I have not read any claims to a fully differential design which seems a bit odd for a product with such pro/commercial usage. The input impedance is quite different for the XLR inputs but that isn't any kind of proof and it's certainly not the 600 ohm "pro standard".