Both of Onkyo's new receivers have 9.2 channels of amplification and are rated at 215 watts per channel and 185 watts respectively, with the RZ-840 offering ultra-wide frequency response (5Hz- 100kHz). 

Both receivers also offer 11.2 channel pre-outs, allowing them to be expanded for 7.2.4 layouts with the addition of a power amplifier.

In addition to being IMAX Enhanced, the RZ840 and RZ740 support a comprehensive range of surround formats, including Dolby Atmos and DTS:X. They also feature Dolby's new Atmos Height Virtualizer, which can create virtual surround and height effects on traditional speakers layouts such as 5.1 with legacy soundtracks.

Both the THX Certified Receivers have seven HDMI inputs (1 front), two outputs (Main [eARC], Sub/Zone 2). All HDMI inputs support HDCP 2.2, 4K/60p, HDR (Dolby Vision™, HDR10, HLG), BT.2020, 4:4:4/24-bit, 3D Video, DeepColor™, x.v.Colour, and LipSync with the HDMI output offering ARC.

As with other Onkyo Receivers, each receiver has built-in room correction, courtesy of Onkyo's proprietary AccuEQ Advance 9-point calibration with AccuReflex.

With Sonos compatibility, the RZ840 and RZ740 are ready to join multi-room network audio systems. Each also has built-in Chromecast and are compatible with AirPlay 2, DTS Play-Fi and FlareConnect.

When coupled with Google Assistant smart speakers, streaming services such as Amazon Music, Spotify, TIDAL, Deezer and TuneIn can be controlled by voice.

Both receivers are designed with parts selected on a listen-measure-listen basis which Onkyo says "delivers uncompromising reference-grade sound."

If you want to know more about IMAX Enhanced, read our guide here.

Both the TX-RZ840 ($2,999 RRP) and TX-RZ740 ($1,999 RRP) are available now.

For more information, visit Onkyo.