How did you know I wanted to try the mdr f1? I bought the ma900 some time ago thinking it would be better since it was technically the successor, but did not like it because of the bass. I hear the mdr f1 has less bass, and still has the large soundstage/comfort. The f1 is so rare that I cannot find any frequency response graphs or in depth reviews, I remember seeing it in the darude sandstorm music video
They've been measured and the graphs posted on a Japanese website, here: http://www.geocities.jp/ryumatsuba/mdr-f1.html (bang around on some of his other measurements to get an idea of what they look like though - these are in no way directly comparable to stuff you might find from InnerFidelity or elsewhere).
I haven't heard the MA900, but sound-wise the F1 are a very fast, very lean, very clean presentation - the closest thing to electrostats I've ever heard from a dynamic can. Their soundstaging is absolutely perfect - they can go out as wide as the K701, and in as close as the RS-1, and every stop in-between, with no trouble. They're also somewhat warm and smooth (not "smoothed over") sounding, with rolled-off treble, which (imho) improves upon the SA5000's "Ice Queen" persona (I still think the SA5000 would be perfect for this thread's original request). They're very mid-centric, and do absolutely wonderful things with vocals, strings, etc, but they can also be very unforgiving - compression artefacts and other blemishes that most speakers/headphones gracefully glide over, the F1 will push right to the center of the stage and say "LOOK HERE, MISTAKES WERE MADE!" This can be grating with some videogames, where their soundstaging and comfort would be otherwise superb. They are bass-light (like the SA5000), and it rolls off gracefully (there's not a "hump" down there, unlike the SA5000) - they have less bass than W5000 or ESP/950. And the top-end rolls off pretty evenly too, which isn't so bad - they never end up sounding tinny or shrill as a result (unlike the SA5000). If you want a lot of bottom-end slam or re-enforcement they aren't the choice for you, but if you want what is quite possibly the king of n-shaped frequency response and soundstaging that is perhaps second-to-none, they're certainly worth a listen.
Oh, and on top of all that, they can be a pain to find a compatible amplifier for, with their 12 ohm nominal impedance and medium-range sensitivity (if memory serves is something in the mid to high 90s). They have a Zobel network that some people report the removal of improves the sound, but I've never attempted that, because I'd rather have the "these work everywhere and are more immune to amplifier output impedance and drive capabilities thanks to the Zobel network" feature (that's roughly what the owner's booklet describes its purpose as).
If the original query is still running - the F1 would hit most of the target goals, but they're more towards "warm" than "cold" so that might be a no-go. Certainly not congested or ooey-gooey, but they do have a somewhat warm tilt. The SA5000 are much colder, and have tighter (but more sharply rolled off) bass. They also do less good with front-to-back imaging, and can't cast quite as wide/broad an image, but are still well into the territory of "airy" sounding. In my view its a toss-up which one is actually more detailed or faster - I know the SA5000 have a reputation as being detail kings and speed demons, and to my ears the F1 can match them, but there exists less sense of exertion while they do it.
To loop back to other cans that've been mentioned (gotta make it at least somewhat relevant, right?):
- The ESP/950 are even more ethereal sounding, but (believe it or not) more forgiving of blemishes in the mids. They have more bass (impact and usable extension), and more treble quantity. They're perhaps faster, but IMHO we're already at a level of play where "faster" isn't really needed with the F1 or SA5000. The ESP/950 are much warmer than the SA5000, and somewhat warmer than the F1.
- The W5000 are brighter, more forceful, and more colored than any of these three. They are probably similar to the SA5000 in terms of soundstage size, but do better with front-to-back (probably on-par with the ESP/950 or F1), but can't cast as wide a stage as the F1. Speed-wise again its hard to judge, but they might have a slight edge. Probably similar extension to the F1 (and similarly graceful in the roll-off), but more impact in terms of what is usable, which is probably mostly due to them being closed. More forgiving of blemishes in the mids, but less forgiving of clashy or treble-forward/aggressive recordings due to their colored highs (which, imho, are divine).
- The HD 600 are like bathing in mud by comparison ("you know what I love about mud? It's so clean and dirty at the same time!"). Much warmer, much more mid-bass presence, more intimate/narrower presentation, better than the SA5000 but worse than the others at front-to-back, somewhat slower, etc. Still a very refined and high quality sound - they aren't just boom and bloom by any means. But they're decidedly different.
In terms of the dry/wet discussion, from dryest to wettest:
- SA5000
- The Mojave Desert
- ESP/950
- MDR-F1
- W5000
- HD 600
This is where T70 and A2000X become interesting - the A2000X are, to quote some other review I read while ago, "a less colored W5000" - for me that wasn't as exciting, but for others it may be just the ticket. They're somewhat dryer, smoother in their frequency response, less colored on the top-end, somewhat less forward, and a bit cooler sounding. Still very fast, spacious, and clean, and provide lots of detail. The T70 are probably as close to a closed-back SA5000 as you can get, for better and for worse. They don't have quite the same razor-sharp presentation of the SA5000, but they're still into the spectrum of cool, lean, fast, dry, etc presentations. But we're talking Antarctica vs a very cold day in the Midwest.
Comfort-wise, the F1 are probably in a league all their own - they're big (that picture is pretty good to gauge), but they weigh a measly ~200g (this is lighter than many Grados and other on-ear headphones). The pressure is so evenly spread around on their rings and headband that you can legitimately forget you're wearing them, and they don't get warm/hot in the least, and breathe fantastically (as you might imagine from one of the most open designs ever). That isn't to say the others aren't comfortable - all of these are very comfortable headphones in my opinion. The SA5000 are probably the oddest, and it comes back to that headband (the trick is to "lean it back" so the "hammock" part is on your head, and the rubberized metal doesn't touch you), but once you acclimate they're very comfortable as well.
Oh, and he's wearing them backwards in that picture. I don't mean "the frame was reversed" either - I mean he's legitimately wearing them backwards and could not put them on his head that way in a comfortable manner.