Halo a-21 and p-5

Does anyone know anything about the halo a-21 and p-5?
It's hard to beat Parasound for the money. NAD is also in this league.
+1 for the A21/A23, great sounding amps.

P7 is a much better pre than the P5.

I would rather get an A23/P7 than A21/P5


I have the A21 and P3. I think Parasound makes great gear. The A21 is a killer amp. Lots of power, but not dual mono.
Why not dual mono