| For one thing, the AMP-100 may have two sets of outputs but looking at the specs it looks like they are two physical outputs in parallel off a single amp channel and not separate channels of amplification, so it is still effectively a two channel amp.
The 160W bridge mode rating is at 1kHz and 1% THD, it is also at 8 Ohms. For full range, quality sound it might effectively be more like maybe 140W and should not be used with less than an 8 Ohm load. The stereo 20-20kHz (still with a relatively high 1% THD+Noise) ratings are 50W per channel into 8 Ohms and 60W per channel into 4 Ohms, the small difference in the rated output between an 8 Ohm and 4 Ohm load indicates that the amp is probably pretty severely current limited with the lower loads.
You noted having eight speakers and two of the amps. Using both the A and B outputs for both channels on the two amps provides eight total outputs, so it would seem to make sense to run a speaker to each output. You could use the Line 2 In and Out connections on the amps to parallel the inputs on the two amps. That would be 30W per speaker (minus line losses) which is probably more than sufficient. However, it sounds more like they parallel wired a pair of speakers to a single output on each channel.
You noted left and right speakers. Are they actually trying to run a stereo ceiling speaker system or were you simply referencing that they were connected to the left and right channels of the amps?
As far as whether it works, if the speakers truly are presenting an 8 Ohm load and not something lower, if the sound level provided is sufficient and if the system is not pushed, then it should work. But it might not be something you would want to warranty or support as an appropriate solution.   |