@Natev305 I had never heard of the MC men220 before your post. When I look up the description I can’t see a reason why it wouldn’t work out play well with the P1. If you had a HT receiver you were using as a preamp and or pre /amp combo then you might rethink adding the P1. Many of the newer HT Receivers process whatever you feed them with their own DAC’s. Changes the sound signature defeating the purpose of an expensive stand alone DAC. I men220 is adjusting the signal purely for room correction and it isn’t reprocessing the analogue signal the P1 is sending back into a digital signal should work well if you leave it in the chain, assuming you like the effect it has on the sound.
Take my advice with a grain of salt as I am not familiar with the men220. I have an Anthem MRX1140 with room correction. I don’t care for it as a Pre in my 2 Channel, when I dug into why discovered it converts / processes all inputs digitally. No way I can use the room correction without it converting the analogue signal back to a digital signal, processing through the DAC’s used for each channel which are designed to deliver Surround sound. When I read about the men220 doesn’t seem like that’s how it works. Heck, even if it does and you like the sound, then it’s a winner. I find in my system I don’t care for the Anthem reprocessing the signal.