Denon AVR-X1600H 7.2CH 4K Ultra HD AV receiver 产品说 www.denon.com
After that, if it still doesn't solve the problem, then unless we are there to help you troubleshoot, it may be very difficult to narrow things down. Also, there is still the <$100 Fosi V3 power amp that you can use to power the surround of height speake...