I tried something similar with my Parasound 2250 V2 amp. I used the 8-4 load setting for a 8 Ohm rated subwoofer that dropped into the 6 Ohm range. The catch is, I had two subs in parallel so it now dropped into the 3 Ohm range. It didn't hurt the amp but when the music dropped into the basement, the sound completely turned to mud and was rather disgusting. Otherwise, the sound was amazingly good. I suspect the same thing will happen in your case. It is usually wise to follow the manufacturer's recommendations, as they do know their products better than anyone else.
Using a bridged amp at 8 ohms w/a 4 ohm speaker.
I have a Parasound A 23+ amp and was thinking of using it bridged w/my Aerial CC-3 center speaker. The speaker is 87 db w/a 6 ohm rating dropping to 4 ohms. Parasound says Bridged 4 ohm operation not recommended. What is the specific harm that it does. Is it to the amp or the speaker or both.