So... hours pass and my judgment sharpens.
1/ For filtering therefore, my favorite is the Apodized fast roll-off filter (the most musical and above all the most natural result to my ears ; all criteria : an ideal between dynamics, resolution, definition, texture, density, separation... everything) then the Linear phase filter (the most technical - definition/resolution and the most tones "neutral" : but... I miss with this one a tiny texture and weight on the tones, with a "sharp to a little to colder (analytical ?) side"...)
2/ Under these conditions the M1p is a version that is a little more defined, resolution, transparent and refined than the M1s... and more powerful. However, if I put the M1p at a 100 rating (reference wise), I put the M1s at 95. By equalizing the sound levels, by doing A/B listening sessions, then by alternating plays, that's what comes out.
3/ Mission accomplished for the M1p... because I had been looking for years without finding it, a real technical and musical alternative to my M1s... more than ever still relevant.
These 2 products have in common a completely direct and pure sound without any particular coloring tendency : perfect balance in my opinion. The definition/resolution/transaprence/details/dynamic (explosive) levels are even slightly improved for the M1p than the M1s. In both cases, it is TOTALLY dead quiet.
The M1s (whatever it's 3 filters) do however seem a bit "warmer" or "analog" sounding compared to the M1p but:
- It may be a psychoacoustic effect as the M1p is incredibly super
CLEAN !..... I think it's hard to find more pure and clean in fact...
- The M1p has so far only run for a few hours, the other for years... however, there are electrochemical components in the recipe... So I have to run them.
All other things being equal, I tend to prefer the M1p with the Ringo's in association, and the M1s with the Fh9 dsw tuned...
All this is fresh and requires hindsight.