There is a difference in the number of the rear HDMI inputs on the TX-RZ720 vs TX-RZ710. The TX-RZ720 has 6 rear HDMI inputs with the same bandwidth that permit transmitting 4K feeds (either 3840×2160 or 4096×2160 resolution) with full 4:4:4 chroma resolution and up to 12-bit color depth (albeit at 24/25/30Hz). It's also possible to transmit 4K @ 50/60Hz on any of the TX-RZ720's six rear HDMI inputs but in that case the chroma subsampling can only be avoided when the color depth is 8-bit. Conversely, if no compromise is made with the color depth (meaning it's 12-bit instead of 8-bit), chroma needs to be subsampled (4:2:0 or 4:2:2). TX-RZ710, on the other hand, has a total of 7 rear HDMI inputs. However, they don't all have the same bandwidth. Specifically, only the first three HDMI inputs (HDMI IN1 to IN3) have the same bandwidth as the TX-RZ720's 6 rear HDMI inputs. Furthermore, TX-RZ710 supports HDCP 2.2 only on these three HDMI inputs whereas the all 6 of the TX-RZ720's rear HDMI inputs are HDCP 2.2 compatible. The remaining HDMI inputs on the TX-RZ710 (HDMI IN4 to IN7), as well as the single front HDMI input that can be found on both the TX-RZ720 and TX-RZ710, are all only compatible with HDCP 1.4 and have limited bandwidth (e.g. 4K signals @ 24/25/30Hz with full 4:4:4 chroma can be transmitted provided the color depth is 8-bit rather than 12-bit). One of the implications of the TX-RZ710's rear HDMI inputs having different bandwidth and HDCP version support is that Dolby Vision pass-through (once you install the firmware update that enables it) will only be possible on the HDMI IN1 - IN3. The TX-RZ720, on the other hand, supports Dolby Vision (as well as HDR10 and HLG) pass-through out of the box on all of its six rear HDMI inputs. In comparison, only HDR10 pass-through is supported out of the box on the TX-RZ710 (provided any of the three HDCP 2.2 compatible HDMI inputs is used).
Another difference is that the TX-RZ720 supports DTS:X out of the box whereas the TX-RZ710 requires a firmware update. A possible downside with the TX-RZ710 is that, in the event you have already completed the AccuEQ setup, you'll need to run the calibration again after applying the update (provided you'd like to utilize the AccuReflex for the purpose of phase-aligning the sound from the height speakers with the rest of your speaker setup so that there is no delay). Dolby Atmos is another object-based audio format that can benefit from the AccuReflex calibration. The TX-RZ720 and TX-RZ710 support Dolby Atmos out of the box. Considering that the TX-RZ720 and TX-RZ710 have 7 channels of amplification, they can drive a Dolby Atmos setup up to 5.1.2 (5.2.2 if you use two powered subwoofers). It should be mentioned, though, that neither of them provides a discrete subwoofer functionality - instead the same signal is output from the two subwoofer pre-out jacks on the TX-RZ720 and TX-RZ710. The two receivers support bi-amping the front left and right channel, albeit only in up to 5.1 channel speaker setup. This means that it's not possible to have bi-amping speakers in a Dolby Atmos setup because the Surround Back or Height terminals are used for the front channel bi-amping, in addition to TX-RZ720 and TX-RZ710 being equipped with only 7 power amp channels. The two receivers have a total of 9 speaker terminals, but only up to 7 can be powered simultaneously. There are pre/line outs for Zone2 which can be used for connecting an external power amplifier in order to have a 2-channel audio in a second room.
The TX-RZ720 and TX-RZ710 have identical power amp section. The two receivers are rated at 110 Watts per channel (2 channel driven into 8 ohms loads, 20-20kHz, 0.08% THD). The high-output transformer and the custom high-current capacitors that can be found on the TX-RZ720 and TX-RZ710 enable fast transient response in addition to allowing the two receivers to achieve a frequency range from 5Hz to 100kHz (+1 dB, -3 dB (Direct Mode)). In order to prevent phase shifting, especially at higher volumes, TX-RZ720 and TX-RZ710 utilize discrete amp circuits. The TX-RZ720 can drive speakers with 4 ohms - 16 ohms of impedance. The same applies to the North American version of the TX-RZ710. In the event speakers with 4 ohms of impedance are used, the "Speaker Impedance" setting needs to be adjusted accordingly. In regions other than North America, the TX-RZ710 supports speakers with 6 ohms - 16 ohms of impedance.
Check availability and pricing on Amazon.com for the Onkyo TX-RZ720 and TX-RZ710 (affiliate links; As an Amazon Associate I earn from qualifying purchases.)
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