You may want to consider the these measurements when evaluating the XPA Gen 3:
The following are measurements for an XPA-2 Gen 3 from Stereophile. In many cases the XPA-2 didn't meet its specifications with THD+N of over 1% (-40dB) in the high frequencies (Fig. 6), and for noise, as examples. It appears that Emotiva doesn't rate the XPA-2 for IM distortion (Fig's. 9-11), which is a particular unpleasant form of distortion or for channel separation (4th paragraph), but the measurements are also not great. The subjective portion of the review (Via page 1 link at bottom of link below) is unusually negative for Stereophile.
https://www.stereophile.com/content/emotiva-xpa-gen3-two-channel-power-amplifier-measurements
A minor annoyance with the XPA Gen3 series is the wiring of the XLR inputs that is the reverse of adopted, worldwide standards (U.S. EU. Asia, etc.). It's hard to understand this unforced error. On occasion owners still note being tripped-up by this error.
A more interesting question involves the unbalanced (RCA) input impedance of the amplifier at described in paragraph 2 of the measurements. At 9.5k to 14.5k ohms the input impedance to the XPA Gen3 it is unusually low. 30k to 50k ohms would be better and is easily achieved, usually at little added cost, with no increase in noise.
This low RCA input impedance is a potential issue with the RCA outputs from many AVR's. Denon AVR's for example, have what appears to be a less than 30k ohm input impedance to each power amplifier channel in their AVR's. This 30k ohms is the impedance that the output from each channel of the volume control drives, since the output of the volume control directly drives the input to the power amplifier, except for the X4500H (and likely the X4700H) which has an IC opamp buffer (NJM8080) for the L/R channels only. This volume control is a CMOS IC unit with build-in, low power opamp/resister gain circuits that provide the volume control function and drives the output. The specifications are based on the volume control driving 47k ohm impedances, never-the-less this volume control should have no problem driving 30k ohms where the volume control will likely provide rated performance.
When the RCA outputs of the AVR described above are used, the input impedance of the RCA load is effectively in parallel with the input impedance of the power amplifier section, even if the power amplifier section is not connected to a loudspeaker. This means that the volume control output is driving an effective load of much less than 10k ohms. This is approximately 7.2k ohms to 9.8k ohms, which is a heavy load for the outputs of the volume control and will likely not provide optimum performance. Even the basic RCA input impedance of the XPA-3 without the parallel load is lower than desired.