In my never ending quest to improve my sound I was wondering if adding a two channel amplifier (the Halo A23) to my HK AVR 645 be worth it. I don't know a whole lot about an amp added to an AVR. will it be a noticable improvement to my 2 channel listening? Does it work for home theater too, or will the fronts overwhelm the rest of the system? Any advice would be appreciated. Thanks.

M22v2
vp100v2
M2v2 surrounds
EP400/EP125
Onkyo TX-SR876
Oppo BDP-83
NAD C542
Sony XBR9