As ADTG said, it is highly doubtful that there are anything in the $4,000+$5,000 pre/pro that has differential connections from input to output. The only one that qualify to claim such topology is the now outdated Denon AVP, regardless of price, well, the $23,000 Datasat RS20i does claim "fully balance" but does that mean fully balance from input to output? Or just the DAC section, we don't know that for sure.
Even at the $23,000 price point, there is no 8K/HDMI2.1 support, ouch!
If you only need 11 to 13 channels, and must have XLR connections then I would just pick one from ASR's reviewed/measured list because then you can read about their "bugs", "fixes" and measurements.
The RMC-1 and the HTP-1 both measured good enough to be in the top 20 on the chart so you can just choose based on features, look, prices and perceived reliability.
Marantz AV8805A Review (AV Processor) | Audio Science Review (ASR) Forum
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