Bill:
The amp is for better sound...same benefit as adding an excellent hi-powered amp to any audio chain. Since the cheap op-amp headphone amp circuit on most devices ist sheisse, the bithead allows an easy load for the device headphone out and gives plenty of current to drive even difficult can loads. And yes, you can get plenty of (deafening) volume out of the thing. FWIW, the beiggest benefits to the bithead (or any HQ outboard amp) are lower bass extension, more bass weight and increased headroom. The bithead also has a patented crosstalk circuit in it to improve the imaging and soundstage. While it won't eliminate the problem, it helps to minimize the in-your-head artificial soundstage that alll phones suffer from. This has all resulted in a MUCH improved listening experience for yours truly. I've always had good phones (mostly AKG), but never really enjoyed them as the overly analytical sound coupled with the above-mentioned imaging/soundstage issues (not to mention the cloesd-in feeling of even light cans) has always made me a non-fan of headphones. The sound quality, noise reduction, comfort and relative stealth of the IEM's coupled with my ipod, total bithead and case combo have converted me over. Oh yeah, they could be used for stage use...like Westone's. Finally, even though the amp can crank with any phones, the substantial noise attenuation coupled with the awesome sound has resulted in a marked DECREASE in the volume necessary to enjoy the music.
Flax:
I agree. I used to prefer cans on my ears to in-ear devices. After I got the SE-530's, I did a 180. FWIW, AKG has a new version out now as well: 702's. I don't know if they are an improvement or not, though. I would love either, I just don't wanna walk around or sit at Starbucks/Barnes & Noble with cans on my head, LOL!
Cheers,
Kevin
(Message edited by kmh364 on November 19, 2008)