Wow, $49.99 for those? I drove a total of 2 hours (1 hour each way) just for mine at $80 a month or so ago. That's really a steal I think considering the UR-55 from Koss are $50 at the regular price. Both of these have recently turned me into a Koss fanboy it seems. I wasn't even a fan with the Porta Pros to begin with.
I try hard not to like them, really I do. I want to like my M50s and other headphones more, but I keep coming back to my DJ 100 headphones because I love them so much. To me, they're one of those cheap headphones you find that are so good, but nobody else in the world seems to know about.
I'm glad to know i'm not the only one that likes the bass. It's disappointing to me that they don't sound the best straight out of an Ipod Touch. That's the whole reason I got them. I use mine with a Total Airhead and with my NuForce Mobile and E5 they just don't sound nearly as good for some reason.
I actually tore mine apart today just to check the driver on them. I should have taken a picture, but I have no clue if it's the same one as on any other Koss headphones. I want to try to upgrade the pads on mine. I think there is a chance some Ultrasone replacement pads might work.
Hopefully someone else can try this out with a good amp and report back. I know of a few people already that didn't seem to like them I guess. I actually even like the sound signature over the M50 and SRH-840. To me they almost feel like a cheaper version of the DT-880 with a lot less detail. As i've said before, some kind of weird combination of an HD-600 and a more toned down version of the DT-880.
I also tried these out for gaming and they worked extremely well. The soundstage and instrument separation is so good on these for such a cheap headphone. These should NOT be $50!
It's just too bad that most of the buyers may be a bit disappointed when using them without an amp. 38 ohm and really need an amp to sound great. I never experienced that before with any other headphone.