a/b-ed the Mikros 90 and the MT220 for a while last night.
Source: Samsung BD-C5505, Amp: Fitz-improved Bada PH-12 (w/1xRCA 5692, 2xSylvania 6SN7GTA), Music: Pat Metheny Group "Letter from Home"
Wider (L-to-R) soundstage with the MT220
Deeper (Front-to-Back) and more 3-D soundstage with the Mikros 90.
The MT220 are more forward and more dark than the Mikros 90.
The MT220 are not as quick or nimble as the Mikros 90. The Mikros 90 have a liveliness/freshness to their delivery that set them apart from the MT220.
Excellent resolution/transparency with the MT220, but ultimately lacking the tonal and micro-dynamic sophistication of the Mikros 90.
Presentation from the MT220 more laminar: emanating from layered sheets; presentation from the Mikros 90 more rounded: emanating from point sources.
Lower mid-bass emphasis with the MT220: gives good weight/slam, but can sound artificially obtrusive and lacking in ultimate coherency and extension compared with the Mikros 90.
Excellent sense of separation and detail with the MT220: the Yamahas are the masters of rendered/fleshed-out/in-your-face detail.
Cleaner treble and purer midrange from the Mikros 90, with a better integrated, holistic and musical presentation from the Martin Logans, IMHO.
The Martin Logan Mikros 90 continue to impress me as some of the most technically adept, natural- and musical-sounding headphones I have ever heard.
But the Yamaha MT220 are no slouches, either, not by a longshot.
moment of truth:
Gun-to-my-head, choose one: Martin Logan Mikros 90