I have run the system over 80% and does sound great. I'm running it as 3
Mark Herrschaft, Amazon
16 August 2015
Summary: It works well enough for 20'x24' room. If you have the same size room (or bigger), you may want to more power. I have run the system over 80% and does sound great. I'm running it as 3.1 system. The Marantz names is still good name to trust.
Great design with amazing sound and practical features you will use
Andrew LaMar, Amazon
6 September 2014
Summary: My Polk's were honestly not that expensive, but this unit makes them sound like it! The difference before and after calibration are night and day. I would imagine this would be true of any speakers connected to this. The form factor is amazing.
Summary: The Marantz NR1604 receiver is excellent, incredible surround sound!!! On screen display very user friendly, easy setup and calibration of the surround sound speakers. The only thing Marantz made a mistake with was not adding WI-FI, it has an ethernet port for connecting to the internet.
Summary: This is my first Marantz receiver. I have one Sony DN1050 receiver and I obviously like the NR1604 more. Especially sound quality is amazing. It's pure, powerful and has lot of details. You barely hear the background noise and can not believe it has only 70W for channel.
Summary: Airplay is a gem, but ALAC encoded files delivered via PMS (Playstation Media Sever) do not play. Needed to configure PMS to transcode to ALAC files. I contacted Marantz and they said they don't support any specific DLNA servers and they don't know what the Japanese engineers use to test with.