I aim to please. Lol
@navyachts few things to know…
1. All M3 DACs have MDx boards. Latest board includes processors for different color displays. Previous MDx versions had several firmware updates and Joe will tell you no sonic difference. But call and confirm
2. Old M1 - no MDx board unless it was sent for that specific upgrade. Remote is old style with receiver that connects via umbilical cord. You really don’t care if it has it or not as you will upgrade it to M1S2 anyway. My goal would be to get one as cheap as possible
3. M1SE check for MDx board pretty sure most recent ones will be fine. Might have umbilical remote as well. Not sure
4. M1S2 will all have MDx. And I believe may all have new multi color display (I turn displays off on all my components) and have the latest remote, same as M3 without umbilical.
If I misstated something anyone please feel free to jump in.