Maybe its not designed to be bridged?
Why does my Adcom GFA-2535 blow fuses?
I'm trying to run an NHT AudioCenter 1 with the B side of an Adcom GFA-2535. It runs fine on just one side, but when I bridge it, one or both of the internal fuses blow after just a few seconds. It's an 8 ohm speaker, and is hooked up as stated in the manual. Any suggestions???