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Yeah, no problems here either with build quality. Sounds like a pretty cool mod, vodkex. Was it hard to do?
Procedure
Well, what is difficult is taking out the drivers from the HTF600 housing since they are glued to the baffle, it can be done with a swiss army knife which is thin and strong enough to cut through the glue around the driver, then with a flat, wide screwdriver (or the equivalent tool from the same swiss army knife) start prying at the driver's edges until it comes off. You'll probably wrinkle the driver's diaphragm during this process (but not cut through it, that seemed impossible during my time doing it), but that's not an issue since it can be brought back to its proper form with some tape, by putting it on the wrinkles and then pulling up.
Although the SR850/HD668B/HD681 housing accepts 50mm drivers, the HTF600's are a bit larger than what can be put in between the tabs in the donor body's baffle. That can be solved with a dremel and a sanding tip, by eating away some of the driver's outer plastic so it fits. If you sand away more than needed, the drivers can be fixed into place with a strip of plasticine.
I also modded the drivers:
- Put some plasticine on the back of the magnet, so the bass becomes tighter. Needed for these drivers, the amount of bass they produce is out of this world, but it's not one-note bass, it's quality bass. If the song calls for it, then it's there, if it doesn't, then it adds body to the music. The extra mass helps control that bass.
- I read about grado modders venting their drivers to increase the amount of bass... I saw someone in this thread do the same to the HTF600's and thought, what the hell, these are cheap enough that if I screw them up I can get a replacement and keep modding. So I popped a hole on the back of the driver, one of the nine or so it has. First of all I noticed less high frequency response, and bass was a little stronger. But what stood out of this was the balance of the sound spectrum, it became more balanced.. those "strange highs" (as described in this thread) these drivers produce weren't as intruding as before. Nice.. let's pop some more. Went with five this time, it got better.. then I popped them all. You know what? These drivers let you hear most if not all the details and nuances in the music if properly driven (decent source + amplifier), and with all these popped holes the only phrase that comes to mind to describe the sound is... "a wall of sound". A grado modder said the same about his vented driver...
Results:
Hearing these you might say "hey, where are the highs?" Well, they are there, butter-smooth highs! If the song calls for them they appear, if it doesn't, they don't. And that's just great, because you can listen to these for hours (6+ hs) without feeling ear fatigue.
And well, putting those drivers inside the SR850/HD668B/HD681 housing, the result is amazing. That headphone housing brings out all the details these drivers can produce (and now I understand why these stock headphones are detail monsters, apart from their already piercing highs), yet the stock HTF600 housing kills details, makes the bass these drivers can pump out almost one-note and there's no dynamics in what is being played since there is no pressure equalization between the ear-driver section and the back of the driver part... There is almost neither layering nor soundstage with the stock housing.
The warm, cozy, fun, inviting, "live-venue" sound signature of these drivers is kept, but now there are DETAILS and COHERENCE. Layering is much improved, I can discern about three or four layers of instruments in most recordings, maybe more... soundstage is much wider and three-dimensional than before, little details like a off-pace breath, a cough lost in the recording studio, someone stepping on their equipment/pushing buttons on them to change guitar effects in the middle of the song... there's impact, there's lots of bass that provides body to the sound, not crap that ruins the music.. amazing, just amazing. These drivers are FAST! Transients are transients here, they sound as intended, sudden, sharp! Instruments' decay like a piano's is beautifully rendered by these drivers, too. Guitars roar, voices, both male and female sound full-bodied and pass on the feelings the singer is expressing at recording time... and I could go on and on... By the way, That improved soundstage does wonders for gaming, too.
The only downside of this mod, is that because of having popped the back of the drivers, they leak sound to your ears (obviously), but now they also do the same backwards. Yeah, there's a lot of air movement now and these drivers LOVE having air to move because of their strong bass response (and extension! it's not hard to hear a 20hz sine wave at moderate volumes, but that's also due to the SR850/HD668B/HD681 pleather pads that create a seal, velour pads will have less sub bass response -and less bass response too, therefore balancing the spectrum even more-), but that much air movement means the headphones become speakers and they're now meant for you to listen at, for example, inside your room, doors closed. But it's quite worth it, you just get lost in the music, you don't listen to the headphones, they become transparent (as in when you forget you have your headphones on and just focus on the music and what you're listening to, not nitpicking "hey, there's too much highs, too little bass, etc"), they deliver music... From complex recordings like progressive rock/metal to more mainstream, simpler pop/rock, electronica, even classical! these shine, I can't find a genre they can't do well. You just don't want to get these off your head.. I can hear DT's petrucci shredding as if he were playing in front of me, every note he plays is crystal clear. You can't get much faster than that... Classical music sounds.. "delicious".
And after all this, making a little correction to the highs according to this
http://www.head-fi.org/a/how-to-equalize-your-headphones-a-tutorial, you get rid of some sibilance present in most if not all headphones in the 7k region... then that's when you get to have your cake and eat it, too!
Conclusion
Of course they are colored, but who cares? Such performance (and the fun factor, but with all the improvements I've detailed so far) for so little money is out of this world. I wish I had a mid-range headphone like a HD598 just to compare, and I seriously think this HTF600/SR850 hybrid wouldn't be too far behind, considering the cost.
Amazing. Too bad the stock housing just destroys what these drivers are able to pull off, what a shame. At least, for what they cost, they are giving you quality drivers and a passable housing, not the other way around, like the other offerings at this price point. Pictures later, the SR850 housing requires desoldering to open it so I can show you the drivers in their new home, and right now I don't want to do that...