It's true what Kurt's link says. Most amps when bridged cannot drive low impedance loads. Your owner's manual probably states what load you are limited to when bridging.
Bridging amps, Good idea or bad idea?
I own a Cambridge Audio 840W, which can be bridged, which makes each amp a 500w mono block as opposed to a 200w stereo amp. That's 1Kw PER CHANNEL! Are there any downsides to doing this? Will there be added distortion, or will it chnage the sound any negatively? I already high pass my speakers because I use a sub so they only get 80hz+ as it is.