you can use the 2 channel bridged to run one sub and the mono to run the other. what kind of amps are talking about? the thing is, there will be 2 different amps playing the same music into 2 subs, and chances are the 2 channel is not a sub specified amp, so you will have 2 different sounding subs that are playing the same music. i dont recommend it.
oic, music quality will be different with 2 different amps. just bought a usx2100 2 chan amp and a shiva but if i upgrade my system i wanted to go with a mono amp. was wondering if i could incorporate the old stuff with the new hehe.