I am borrowing my friend's Parasound Model 2125 amplifier this weekend. It has four speaker outputs, is stable to 2 ohms and has front bezel A/B switches. I want to use it to compare two pairs of 4 ohm low efficiency speakers (my MBQs and Danes) head-to-head. I'll keep the volume down, and I'm not really looking for hi-fi, just subtle differences between the speakers.

On paper, this should work, but will this amp be struggling to switch between these speakers? Can I damage the amp this way?