Mvp871 is based on denon dvd 2930ci. It uses the same drive, mpeg decoder and the video board. Mcintosh upgraded the power section and audio section. Audio section has 4 x burr brown pcm1792, one for each pair and another for the dedicated stereo output.
Mvp901 is based on oppo bdt-101t transport. New power section and ess sabre dac chip.
Mx-151 digitizes all of its inputs including 7.1 analog input. There is no point in going in analog into mx-151. Hdmi connection would keep the signal in digital domain and avoid d/a to d/a conversions.
If there is an upcoming uhd player, I would wait on it but if you don't care for video mvp901 is a good transport.
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