I have a Forte Model 4a. I was not aware that it could be used in a bridged mode. I don't believe that there are any rear (or front) panel switches for that purpose. It is a really sweet 50 wpc class A amplifier. I use mine in the summer months to keep the house from getting too hot (I use my Atma-Sphere's the rest of the time). I'm probably a "fuddy duddy" in that I find 50-60 wpc just fine for my listening tastes(and I have a large listening room, too). When I was younger, I did bridge some Hafler amps (135 w/c stereo mode, and 400 w/c bridged mono), and found that bi-amping in stereo gave a much smoother sound, The bridged amp mode played a LITTLE louder, but was much more "etched" and harsh sounding. (Just my 2 cent rant on "bridging"). Happy Listening,
