I had the M3. It is not the last word in having an open airy high end. I never used the treble control but that might help with that. The M3 is sort of closed in the upper end. I haven't heard the I-3SE but from my reading, it is very different from the M3. The M3 would probably be a bit rolled off in the upper mids and highs compared to the I-3. But, the synergy of your speakers with either integrated (the strength of the match) will be also be very important.
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