Denon Avr3000 . It's an AV receiver but I run it 2 channel with 2 pairs. This thing is awesome, even compared to my 2270 I sold recently. I read a review
DENON AVC-3000/AVC-3000G Specifications Denon / Den On
Denon AVC-3000, G AV Surround Amp. Original Service Manual w/ Money-Back Guar. | eBay
ヤフオク! - (整備済)DENON AVアンプ AVC-3000 リモコン取説...
Denon AVC-3000 AV Surround Amplifier Manual | HiFi Engine