Some notes and quick comparisons against other phones (Technical Pro HPT990 and Koss Portapro), the Somics have maybe 20-30 hrs on them (burn+actual listening time) -
- There isn't much else I can add on to Joe's impressions as he pretty much hits the nail on the head in terms of how they sound =). Theyre warm, slightly bassy (not basshead bassy as mentioned, just above flat), with a fairly smooth top end and a nice amount of sparkle. They sound somewhat thick with the bit of midbass warmth they have going on. Midrange is forward and vocals are intimate but can sound a little bit "boxed in" on some tracks, despite the large soundstage.
- Immediate differences noticed when switching back and forth with the HPT990 - a competitor in terms of price, though it looks like theyre abit more expensive than the MH463 right now - The 990s have more of a upper mid to lower treble emphasis with a slightly recessed midrange compared to the 463, making them sound seemingly airier and abit more detailed. They both have some midbass warmth to them but to me the 463s warmth is more pronounced, which is probably why mids/vocals sound more forward, thick and intimate. Bass on the 990 extends down deeper into the sub-bass than the 463. The 990s sound like they have a wider soundstage despite them being semi-open vs the open 463; it must be the velour pads and airiness added on from the slightly more emphasized top end. The 463 is better with depth though and beats the 990 out in terms of forward projection. Both have fairly good imaging and separation. Both make for some solid gaming cans. I actually spent a lot of yesterday playing ACIII using the Somics and it was a great experience.
- I think the closest other headphone I have with a similar signature is the Koss Portapro. Mine is modded with KCS75 clips and "quarter-modded" foams, and they sound fairly close in terms of signature, but IMO the MH463 is technically superior; better detail, and larger spatial presentation. The Portapros also sound abit darker, and the bass is slower.
- On construction, its been mentioned already but the pads are pretty shallow and my big ears do tend to press on the pad lining, causing discomfort after a few hours of wearing them. A quick remedy to that could be to remove the red+black pad lining and inserting a more comfortable foam lining, or to stuff the undersides of the pads so they arent so shallow.
MDR-7506/V6 pleathers, Beyer, or Pearstone velours could fit, they look about the same size fwir. Shure SRH840 pads might be a possibility as well, I would try mine but theyre stretched out to heck thanks to my T50RPs 
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Also, there are some creaky points on the headphone, mainly where the cables go into the cups and where the plastic yoke goes in to the cups. Maybe a bit of graphite lube can fix that?
I just bought b1o2r3i4s5's pair, they should be at my doorstep in 2-7 days...
Then we can get a comparison between the HD600 and these :)
Amazing aren't they? Glad you're enjoying them
)
