The HTx is not adding anything to the system you described, other than an overkill way to get bass management. Just use the pre-outs from the receiver directly with your amps if you’re fine with the distortion performance and unbalanced connectors.Most AVR's analog stages are adequate and minidsp ADC is not noisy at all. Any added distortion is well below what speakers, rooms, and sub introduce. There is an issue of lip-sync latency but that can be managed