AT A GLANCE
Wi-Fi, AirPlay, Bluetooth
No Ultra HD scaling
The Onkyo TX-NR545 is a wireless-triple-threat receiver with an intrinsically good-sounding amp.
Most A/V receivers have seven audio channels for reasons that date back to 1999 and are all but forgotten. The original rationale for adding two channels to surround sound’s basic 5.1 footprint was to accommodate back-surround speakers for THX Surround EX (later renamed Dolby Digital EX) and DTS-ES. While I mean no disrespect to the many readers who enjoy the back surrounds in their 7.1 systems, I’ve been against back surrounds from the beginning. My argument in one sentence is: Three channels in front, four in back—what’s wrong with this picture? I’ve always considered 5.1 the bedrock standard of surround sound, and I still do, even today.