Bridged amps vs stereo vs monoblocks.

I don’t have any real issue, but I’m curious about how the bridging of an amp functions. I have a 80 W stereo amplifier, which can be bridged to provide 220 or so power into a load. This amp also has a hefty power supply which makes it work beautifully with my Magnepan’s. However, I used to have two of these amps bridged.  One of which I lost due to it breaking so i replaced with an unbridged stereo amp, which I’m only using one channel. So what a strange hodgepodge of connections, right? It sounds great and I am have no problems but I’m curious if I was doing some thing that is easily changed to provide benefit. Mixing two different amps for example.  Or I read when an amp is bridged it is sensing a four ohm load as a two ohm load and therefore what does that even mean? Also, using one part of a stereo amp is odd, but does that change anything, especially if there’s one power supply? Curious, if there any principles I could learn about this from those more familiar with those equations thanks!


Although some here would be aghast about using different amps for each channel, if it's sounding good to you enjoy. The difference could be smaller than the room sound for each speaker.

A bridged solid state amp will see half the speaker impedance and output twice the current into the speaker load. The penalty is hotter running conditions for the pair of amps. Tube amps cannot be bridged. Instead a stereo tube amp can drive one speaker by paralleling the outputs of both channels. This gives twice the voltage and current into a single speaker. A McIntosh 275 paralleled as a mono amp will output 150 watts and twice the current.

A bridged GAS Son (80wpc) will output 240 watts into 8ohms and run considerably hotter. Most solid state amps will triple their wpc rating when used as a mono bridged amp.