Since the Onkyo TX-NR787 and TX-NR777 are not part of the RZ-series (like the TX-RZ630 is), they omit the custom block capacitors that can be found on the TX-RZ630 but keep the H.C.P.S. (High-current Power Supply) transformer which allows them to respond nearly instantaneously to changes in the audio signal, hence they're capable of Dynamic Audio Amplification, just like the TX-RZ630. It needs to be said, though, that the frequency response (in Direct Mode) on the TX-RZ630 is 5Hz-100kHz (+1dB,-3dB) whereas the TX-NR787 and TX-NR777 have a frequency response of 10Hz-100kHz (+1dB,-3dB) in Direct mode. Nevertheless, the TX-NR787 and TX-NR777 feature some of the same circuits as the TX-RZ630, such as the ones for non-phase-shift amplification and Vector Linear Shaping Circuitry (for the front channels), meaning that the TX-NR787 and TX-NR777 are also able to produce clear audio, and filter high-frequency noise (on the front L/R channels). There is a difference in the power output on the three Onkyo receivers, though. The TX-RZ630 is rated at 90 Watts per channel, the TX-NR787: at 100 Watts per channel, and TX-NR777: at 110 Watts per channel. This is with 2 channel driven into 8 ohm loads, 20 Hz-20 kHz, 0.08% THD for all three Onkyo receivers.
Not only the TX-RZ630 and TX-NR787 have the same connections but the layout is also identical. When it comes to the TX-NR777, the difference (vs TX-NR787 and TX-RZ630) is only in the layout (and not in the number or type of connections). Specifically, the RS-232 serial input, the IR in, and the 12V trigger output are placed to the right of the speaker terminals on the TX-NR777, and to the left on the TX-RZ630 and TX-NR787, respectively. Another difference is in the placement of the 2 composite video inputs which are placed to the right of the 2 component video inputs on the TX-RZ630 and TX-NR787, and to the left (of the 2 component video inputs) on the TX-NR777, respectively.
There are 9 speaker terminals on each of the three Onkyo receivers but only the TX-RZ630 and TX-NR787 are able to power surround back and height speakers simultaneously, meaning they have 9 power amplification channels, and so are able to support 7.2.2 channel Dolby Atmos setup (or 5.2.4 in case you've connected two sets of height speakers). In case of the TX-NR777, you have to choose between having Surround Back or Height channels not only because there aren't dedicated terminals for these two types of speakers to be connected at the same time, but also due to the fact that the TX-NR777 has only 7 power amp channels, which limits Dolby Atmos to 5.2.2 channels. Neither of the three receivers allows you to use an external amplifier for the purpose of expanding a Dolby Atmos setup because the TX-RZ630, TX-NR787, and TX-NR777 have only 2 subwoofer pre-outs, in addition to analog outputs for Zone 2. Speaking of which, it needs to be said that the TX-NR787 and TX-NR777 have only line-outs for Zone 2 whereas the TX-RZ630 has pre/line-outs for a second room. This means that you can only connect a pre-main amplifier to the TX-NR787 and TX-NR777 whereas with the TX-RZ630 you can also use an external power amplifier for Zone 2. In terms of built-in amplification, the TX-NR777 is not able to separately power Zone 2 and 3 like the TX-RZ630 and TX-NR787 are able to (but only in case you are running no more than 5.1 channels in your Main Zone, and not using a bi-amping connection). However, it's still possible to have a powered Zone 2A/2B with the TX-NR777, albeit in that case the two sets of speakers (for Zone 2) need to have an impedance of 8-16 ohms.
The TX-RZ630 and TX-NR787 have the same firmware, and the firmware updates that have been released so far bring identical functionality to both receivers such as support for Sonos connect (in case you have such device). Since the TX-NR777 is not compatible with Sonos connect, it won't receive a firmware update for that functionality. That being said, there is a firmware update for all three Onkyo receivers that adds support for Amazon Music (the Onkyo Controller app for mobile devices is also needed for the initial set-up).
While both TX-NR787 and TX-NR777 are THX Certified, the TX-RZ630 is not. The certification level on the TX-NR787 and TX-NR777 is "THX Select", meaning they are suitable to be used in rooms where the distance from the screen is about 10 ft. (3 m), and the room volume is up to 2,000 ft3 (57 m3). By having different THX modes (e.g. THX Cinema, THX Music, THX Games), the TX-NR787 and TX-NR777 can play accurately (in terms of the THX Reference Level) not only movie soundtracks but also other content. This is achieved by various technologies such as the THX Loudness Plus, Re-EQ, Timbre Matching, Adaptive Decorrelation, Advanced Speaker Array (ASA) (that are activated depending on the THX listening mode and your speaker setup). THX Loudness Plus is used to compensate for any spatial and tonal shifts resulting from the volume level being lower than the reference level. Adaptive Decorrelation changes the time and phase between the surround speakers when mono surround signals are detected (in order for the sound field to remain spacious) whereas Timbre Matching, as the name suggests, matches the tone and timbre of the surround speakers to the front speakers (so the sound movement is smooth).
Although all three Onkyo receivers are able to perform acoustic room calibration, only the TX-RZ630 is able to detect standing waves (i.e. sound waves that do not move spatially) by the means of multi-point measurement, and equalize speakers so to remove these waves. Another advantage of the AccuEQ Advance (which the TX-RZ630 has) in comparison to the standard AccuEQ system found on the TX-NR787 and TX-NR777 is the ability to detect and compensate for subtle background noises that the receiver may emit. The TX-RZ630, TX-NR787, and TX-NR777 are all equipped with the AccuReflex, meaning they are able to align the phase of up-firing speakers with the rest of your speaker system so that there is no delay between reflected and direct sound.
Check availability and pricing on Amazon.com for the TX-RZ630, TX-NR787, and TX-NR777 (affiliate links; As an Amazon Associate I earn from qualifying purchases.)
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