Onkyo intros first IMAX Enhanced THX Select Dolby Atmos AV receivers

posted on Wednesday, 1st May 2019 by Steve May

Dolby Atmos  IMAX  home cinema  High Res Audio 

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Classic meets cutting-edge on two AV receivers joining Onkyo's premium RZ Series line, this month. The nine channel Dolby Atmos and DTS:X TX-RZ840 (pictured above) and TX-RZ740 are the first Onkyo AVRs both offer THX Select and IMAX Enhanced certification.

IMAX Enhanced encoded software uses DTS:X to deliver the full dynamic range of IMAX theatrical sound mixes. THX Select certification delivers cinema-reference volume in rooms where the viewing position is about 3.5m from the screen.

Power output is rated at 215 W/Ch into 6 ohms, and 185 W/Ch into 6 ohms respectively. Systems can be expanded from 7.2.2 to 7.2.4 with additional amplification. Installs without Atmos height speakers can take advantage of a Dolby Atmos Height Virtualizer, which creates a virtual height effect.

CI friendly, both AVRs offer bi-directional Ethernet LAN for IP control, an RS-232 serial control port, IR input, 12V trigger out, OSD output. An optional rack-mount kit makes for easy system integration.

Each has seven HDMI inputs, all supporting 4K/60p, HDR10, Dolby Vision, HLG (Hybrid Log Gamma) and WCG (Wide Colour Gamut). The TX-RZ840 also features eARC on the main HDMI output. It works with Dolby Atmos and DTS:X as well as Dolby Digital, Dolby TrueHD and DTS-HD Master Audio via tuner or video streaming apps built into Smart TVs.

TX-RZ740 Crop

As with other AVRs in the brand’s RZ Series, both models have upgraded Dynamic Audio Amplification (DAA) systems, which uses a custom-made High-Current Low-Noise Power Transformer, while a new HDMI board features shorter signal-paths and larger ground paths for optimised signal transfer.

Room equalisation is achieved via Onkyo’s AccuEQ Advance 9-point room acoustic calibration, designed to combat standing waves.

The feature roster is stacked. Both support Works with Sonos, have Chromecast built-in, and are compatible with AirPlay 2, DTS Play-Fi, and FlareConnect. Multiroom support covers three zones (including the main room), using separate Zone 2 and Zone 3 DACs.

Wireless support includes dual band Wi-Fi. For vinyl record collectors, there’s a discrete MM phono pre-amp.

Users can view source data such as HDR format, video resolution, frame-rate, and audio codec, and compare it to the output playback settings without interrupting playback. A DSP-controlled Vocal Enhancer is accessed via keys on the remote control or front panel, which allows dialogue to be raised or lowered.

Beneath the lid, there’s an AKM multichannel DAC which supports 384 kHz/32-bit conversion. The TX-RZ840 supports DSD Direct 11.2 MHz playback, while both can convert DSD 11.2/5.6/2.8 MHz to PCM. FLAC, WAV [RIFF], AIFF, and ALAC are supported to 192 kHz/24-bit resolution.

The TX-RZ840 retails for £1,199, the TX-RZ740 is priced at £949

Steve May

Inside CI Editor Steve May is a freelance technology journalist, who also writes for T3, TechRadar, Home Cinema Choice and ERT (amongst others).

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