Just received a parasound halo a23 from my wifes boss. On loan until he needs it this spring. Better bass definition and the highs are very clear. I could actually identify sounds I couldn't identify previously on tracks. Like clacking wooden sticks and such. Way better than my yamaha rxv660 by a lot. And not too bad for price either. He got it on sale for just under $500 !!! Very good build quality btw. when looked at this slim sleek amp I didn't expect it would weigh so much.. wow. I would definitely recommend this amp to anyone looking to go the separate amps route.