I also own a pair of A23s, each used in stereo mode since I have multiple speaker pairs. I think the A21 might be the better choice. Although you may get more net WPC with the A23 in mono mode, current delivery on the A21 is 60 amps, versus 45 amps for the A23. I would give Parasound support a call. They are an absolutely fantastic and helpful company from the owner on down. They will give you sound advice.
Parasound A-23s in mono or A-21
I currently have a Parasound A-23 and have upgraded my front l/r speakers to B&W N802's. I feel that I am now a little underpowered and will be looking to upgrade my main amp. I am looking at two options both would be in the same price range. First option would be to purchase a second A-23 and running the two in mono and the second would be to get rid of the A-23 and go to an A-21. The concern I have with two A-23's is that they somewhat discourage against using the amps in mono on speakers that go below 8 ohms. The B&W's state that they can dip down to 3 ohms. The A-21 has advertised specs at that load, unlike the A-21's in mono.
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