The Onkyo TX-RZ730 is THX Certified whereas the Onkyo TX-RZ630 and TX-RZ620 don't have this certification. What this means for the TX-RZ730 is that various aspects, such as power output, frequency response, bass management, and signal-to-noise ratio have been tested by THX in order to ensure that the TX-RZ730 is able to accurately play soundtracks at THX Reference Level in different THX listening modes. The certification tier is "THX Select", so the TX-RZ730 is suitable for rooms that are up to 2,000 ft3 (57 m3) in size, with the viewing distance being 10 ft. (3 m). As part of the THX certification, the TX-RZ730 is equipped with various features such as THX Loudness Plus, Re-EQ, Timbre Matching, Adaptive Decorrelation, and Advanced Speaker Array (ASA) that have specific functions. For example, THX Loudness Plus is intended to compensate for any spatial and tonal shifts when the volume level is lower than the reference level. Adaptive Decorrelation and Timbre Matching, on the other hand, attempt to solve the issues arising from home theater typically having fewer surround speakers than a movie theater by adjusting the tonal characteristics and timbre of your surround speakers in order to match the front speakers (so that sound moves smoothly from the front to surround speakers), and changing the time and phase between the surround speakers with mono surround signals (in order for the sound filed to remain spacious).
Even though both the TX-RZ730 and TX-RZ630 have 9-channel amplification, there is a difference in the power output which is 100 Watts per channel on the TX-RZ730, and 90 Watts per channel on the TX-RZ630 (2 channel driven into 8 ohm loads, 20 Hz-20 kHz, 0.08% THD). The TX-RZ620 has a rated power output of 100 Watts per channel (with the aforementioned parameters) but only 7-channel amplification. Being part of the RZ series, all three Onkyo receivers utilize high current power supply and large customized capacitors, so the TX-RZ730, TX-RZ630, and TX-RZ620 all have a frequency response of 5Hz to 100kHz, as well as the ability to drive speakers with 4-ohms of resistance.
The TX-RZ730 has 11.2 channel pre-outs, in addition to dedicated pre/line outs for Zone 2. Furthermore, there are also pre/line outs for Zone 3 but they are shared with Height 2 for the main room, so cannot be used simultaneously. Nevertheless, the 11.2 channel pre-outs allow the TX-RZ730 to support Dolby Atmos speaker configurations up to 7.2.4 channel by connecting an external stereo amplifier. Without it, the TX-RZ730 has the built-in amplification to drive up to 5.2.4 or 7.2.2 channel Dolby Atmos setup. The latter applies to the TX-RZ630 as well because this receiver also has 9 power amps. Unlike the TX-RZ730, though, the TX-RZ630 has only 0.2 channel pre-outs, meaning you can only connect two powered subwoofers for your main room. In other words, it's not possible to use an external power amplifier for expanding a Dolby Atmos setup. There are dedicated Zone 2 pre/line outs for a second room on the TX-RZ630, though. The TX-RZ620 has the same pre-outs as the TX-RZ630, meaning 0.2 channel for the main room, and dedicated stereo pre/line outs for Zone 2. As a result, the TX-RZ620 doesn't support expanding a Dolby Atmos setup via an external amplifier either, thus Dolby Atmos layouts ate limited only up to 5.2.2 channel on the TX-RZ620 (i.e. the number of channels it's able to power internally).
Even though the TX-RZ630 and TX-RZ620 have 9 speaker terminals each, some of the supported speaker combinations vary, which is expected, given the fewer power amp channels on the TX-RZ620 vs TX-RZ630. For example, you can connect either Surround Back or Height speakers on the TX-RZ620, but not both. Furthermore, in case of bi-amping the front channels, neither Surround Back, nor Height speakers can be connected because the same terminals are used for all three layouts on the TX-RZ620. There are, however, dedicated terminals for Zone 2, meaning that you can have 7.1 channel speakers for your main room connected to the TX-RZ620 as well as stereo speakers for Zone 2, albeit the surround back speakers in this case won't be powered when the Zone 2 speakers are active, and vice versa. The TX-RZ630, on the other hand, allows you to connect Height 1 and Surround Back speakers at the same time since it's able to power them simultaneously. It needs to be said that Height 1 is also used for a Bi-Amping connection or Zone 2, whereas the Surround Back is utilized for Zone 3 or Height 2. In case of running a 7.1.2 channel Dolby Atmos in your Main room, there isn't any available speaker terminals left for connecting Zone 2 speakers on TX-RZ630. The TX-RZ730, however, allows you to do exactly that because two of its 11 speaker binding posts are dedicated for Zone 2. While this provides you with the ability to easily switch between different speaker layouts in order to allocate power for Zone 2 without having to reconnect speakers, it needs to be said that only up to 9 of 11 connected speakers can be active at the same time.
All three Onkyo receivers come with a supplied microphone used for measuring the speakers response so that the AccuEQ acoustic room calibration can be performed. During this process the optimal sound pressure level (based on the distance from your listening position) and crossover frequency of each speaker are set. Furthermore, the speakers are equalized based on the acoustic characteristics of your room which minimizes the chance of sound waves of the same frequency, or the so-called standing waves (due to the lack of spatial movement), to occur. It needs to be said, though, the TX-RZ730 and TX-RZ630 feature the AccuEQ Advance while the TX-RZ620 has the standard AccuEQ technology. The difference between the Advance and standard version is that the former supports multi-point measurement which allows the TX-RZ730 and TX-RZ630 to detect standing waves, and equalize the speakers accordingly in order to remove these sound waves. Another difference is that the AccuEQ Advance is able to detect and compensate for subtle background noises, so that the data obtained from measuring the speaker response is not distorted.
Check availability and pricing on Amazon.com for the TX-RZ730, TX-RZ630, and TX-RZ620 (affiliate links; As an Amazon Associate I earn from qualifying purchases.)
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