Onkyo TX-NR585 develops 80 W per channel with support for Dolby Atmos and DTS: X formats. In frames of Onkyo TX-NR585 vs Onkyo TX-676 comparison, the NR676 has a more powerful amplifier (100 W/channel), but it works at lower impedance - 4 Ohm versus 6 Ohm. In addition to standard wireless interfaces, Onkyo TX-NR585 supports Chromecast, DTS Play-Fi, and Spotify Connect. Also in this model, there is a proprietary FlareConnect technology with audio mirroring. The receiver provides the ability to output video in 4K resolution, including HDR10 and Dolby Vision.
The 7.2-channel Onkyo TX-NR676 supports modern DTS: X and Dolby Atmos formats (up to 5.2.2 channels), and DTS Neural: X and Dolby Surround codecs are used to convert the sound of standard multi-channel formats to an object-oriented 3D sound. The converter is a modern AK4458 DAC. Speakers are auto-calibrated by AccuEQ, while AccuReflex technology provides speaker phase compatibility for Dolby Atmos surround sound. Onkyo TX-NR676 has Bluetooth, AirPlay and dual-band Wi-Fi versus the Onkyo TX-NR585 which has only Bluetooth and AirPlay.
The Onkyo TX-NR676 is better receiver in this comparison. Check Onkyo TX-NR676 price