I do own the S3 and have hence used them extensively in my own system.
Listening to the S3 mk2 in Munich this is what I found. The mk2 sounded like the S3, but yet quite a bit more refined with two major differences:
- the diamond coating on the beryllium diaphragms clearly takes out some sharpness of the tweeter - it was a smooth and harmonic sounding beryllium tweeter, no edges, no sharpness - yet the 50 kHz resolution
- the midrange might have changed a bit with the graphene unit, but I did not notice a significant difference
- the graphene woofers do bring a new texture to the bass, the sound was deep and more organic; very obviously the M Project goodies gave the S3 mk2 a major push upwards in the bass - aluminum vs. graphene the latter offers much more
- now the S3 mk2 is again the most advanced S series speaker, having caught up in the tweeter, but adding the graphene woofers
New versions of the S5 mk2 and the S7 pending, I guess.
This is of course with the caveat that the High End demo was in unfamiliar acoustic conditions and unfamiliar chain (Meitner I have, but Spectral and MIT are different from my own electronics).
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