Calanctus,
I totally agree with your take on auditioning Martin Logans. If you want to hear them here in Phoenix, you go to Showcase (owned by the Tweeter group). You'll hear them with Krell multichannel & they are bright & forward in this demo. (This is a corporately arranged marriage!)
I've heard MLs sound very good with an Adcom mosfet amp.
I bought an Adcom 5500 a friend traded in on an Aragon 4004MKII. The Aragon has more power, but I like the MOSFET sound better.
I've heard current Quads, Sound Lab(s) & even with the purpose-designed Innersound amp, I like Maggies & Apogees better. This is just my personal preference.. Without that ribbon, something is missing.
Maybe that's why Martin Logan uses a dynamic tweeter in their top center channel?