Left driver seems pretty darn clean O_O makes m80 look like shit, distortion measurements would be nice. Damn decent for 25.

Just how expensive are these?  Looks like just some EQ short from very good.

They look like they would sound similar to my darker variant of DT1350 sans the 14k resonance... but with some shout instead.

After the shipment of these and my Denons went missing, I purchased another S400 and new AKG pads ($4 on ebay). The AKG pads that are being measured are stretched out due to being transplanted from a bigger driver housing. The consequence of a more loose fit I believe translates to poor controlled bass thats a little sloppy. The new AKG pads are a tighter fit and have little bit bass quality. After referencing The Paradox however, I went back to the stock pads and dampened cups to reduce the 'U' shaped response.

Marv, feel free to take these apart and change pads, etc if you want. I'm guessing you probably don't have much time these days to tinker though. Also, I'm in no hurry to get the shipment back if you want to hang on to them for a bit.

Also, there is a slightly more expensive cousin, JVC HA-S500. Carbon nanotube supposedly, that's their secret. The real question is how they make them so cheap.