The TX-RZ620 and TX-RZ610 differ in the number of rear HDMI inputs, as well as their bandwidth. In terms of the HDMI 2.0 spec, all 6 rear HMDI inputs on the TX-RZ620 are full-bandwidth. TX-RZ610, on the other hand, despite having a total of 7 rear HDMI inputs, has full-bandwidth capacity on only three of them. This means that 4K feeds (either 3840×2160 or 4096×2160 resolution) at 24/25/30Hz with full 4:4:4 chroma resolution and up to 12-bit color depth are supported only on HDMI IN1 - IN3 on the TX-RZ610 and on all the TX-RZ620's six rear HDMI inputs. When it comes to 4K @ 50/60Hz, supported (on the aforementioned inputs) are either 4:4:4 chroma resolution (provided the color depth is 8-bit), or 12-bit color depth with 4:2:0 or 4:2:2 chroma subsampling. The HDMI IN4 - IN7 on the TX-RZ610, on the other hand, in addition to the single front HDMI input on the TX-RZ620 and TX-RZ610, have limited bandwidth. Furthermore, they support only HDCP 1.4 as opposed to HDCP 2.2, meaning that these inputs cannot be used for HDR signal pass-through. Instead, the HDMI IN1 - IN3 on the TX-RZ610 (labelled as HDCP 2.2) have to be used for that purpose (Dolby Vision pass-through is supported after a firmware update). In contrast, all rear HDMI inputs on TX-RZ620 are HDCP 2.2 compatible and Dolby Vision pass-through is supported out of the box (in addition to HDR10 and HLG).
The TX-RZ620 and TX-RZ610 also differ in terms of whether they support certain features out of the box or after a firmware update. Besides the already mentioned case of Dolby Vision pass-through, the TX-RZ610 also needs a firmware update for DTS:X whereas the TX-RZ620 supports this object-based audio format out of the box. The need of a firmware update for DTS:X on the TX-RZ610 entails performing the AccuEQ calibration again after support for DTS:X has been added. However, you can avoid that by updating the TX-RZ610's firmware prior to running the AccuEQ setup. The AccuReflex function is particularly useful when you have upfiring height speakers since it aligns the phase of the indirect (reflected) sound produced by them with the direct sound from the rest of your speaker system. Thus, a cohesive sound stage with Dolby Atmos-enabled speakers can be achieved. Both the TX-RZ620 and TX-RZ610 support Dolby Atmos out of the box in up to 5.1.2 channels (5.2.2 channels in case of two powered subwoofers are used).
The TX-RZ620 and TX-RZ610 are rated at 100 Watts per channel (2 channel driven into 8 ohms loads, 20-20kHz, 0.08% THD). There are 9 speaker terminals on each of the two receivers although only up to seven speakers can be powered simultaneously. TX-RZ620 and TX-RZ610 support bi-amping the front left and right channel in up to 5.1 channel speaker setup which rules out the possibility of bi-amping connections in a Dolby Atmos speaker setup. Instead of conventional analog filters, the TX-RZ620 and TX-RZ610 utilize Vector Linear Shaping Circuitry (VLSC) on the front channels for the purpose of more thorough removal of digital pulse noise so that smooth output wave form can be achieved.
Both receivers require a firmware update in order to support FlareConnect which is a wireless multi-room audio system. Furthermore, a compatible wireless speaker(s) are also needed (sold separately). Selecting the music source and the destination (provided you have multiple supported wireless speakers in different rooms) is done via the Onkyo Controller App (available for iOS and Android devices). The supported sampling rates when casting music from USB or music server are 44.1kHz and 48kHz. The FlareConnect also allows you to wirelessly cast music from streaming services and external audio inputs.
Check availability and pricing on Amazon.com for the TX-RZ620 and TX-RZ610 (affiliate links; As an Amazon Associate I earn from qualifying purchases.)
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