I'm considering building a no-holds-barred M^3. A couple of quick questions:
1. Has anyone here ever built a fully balanced M^3? Any opinions on whether it was worthwhile?
2. Has anyone here built both an M^3 with variable gain, and an M^3 with a bass boost, or else converted from one to the other? Which did you ultimately prefer, and why?
3. How hard is it to get to a truly neutral position if you build an M^3 with the bass boost option? Is it really just a question of turning the bass boost pot all the way down, or will there still be some (albeit minimal) bass boost even at that setting?
4. Is the bass boost feature really useful, or does it wind up making the sound muddy? With but one exception, I generally haven't been a fan of bass boost features in the past. It does seem like something that might be useful for warming up some cans. I recently acquired a K.I.C.A.S. Caliente, and I find it (a) refreshing to have an amp that isn't neutral (and doesn't try to be), and (b) a nice compliment to my Alessandro MS2s.
Any insight or advice would be greatly appreciated.