I used the Denon only for first couple of months and was satisfied. I wondered what difference amps would make so I ordered the monoblocks on 30-day trial to listen for myself. IMHO the 80's sound better with the monoblocks at low volume. At mid to high volume it only gets better. Is it dramatic? My ears say so. Others say it's in my head. That's why I say the 30-day trial is a great thing.