AKG High Performance Closed-Back DJ Headphones - K181 DJ I didn't realize the measurement data on Changstar was not available to guest readers, so I thought it would be a good idea to migrate the measurements and quick subjective impressions here. The K181 DJ is an over-the-ear supraaural headphone. The feel is kind of solid and clunky as appropriate to it being a DJ headphone. What makes the K181 particularly interesting is that it is a closed design, it's good sounding, (very rare to find a good sounding close headphone), and it's cheap. As of 10/26/2015, Amazon Prime has it available for $119. The clamping force is solid, but not excessive. I'd say the clamping force is less than the HD650's out of the box. The pads aren't luxurious or plush, but rather firm fitting on the ear. The isolation is quite good. The K181 make excellent work headphones where you don't want to bother your co-workers or wouldn't worry too much about them being ripped off. There are two bass boost switches, one on each earcup. The bass boost is tastefully done and doesn't intrude into the mids. I prefer the headphones without the bass boost. Yeah, decent plankton too. Gilberto currently has possession of this headphone, and I have to admit that I do miss it at work. (I can't use open headphones at work and don't feel comfortable leaving expensive stuff on my desk.) Figure 1: Frequency Response, Harmonic Distortions, and CSD of K181 (one channel only) The headphone sounds a bit warmer than measurements would indicate. (Supraaural designs can be difficult to measure.) I didn't have any subjective issues with the treble as I did with the Senneheiser HD25, another competing supraaural headphone. Gilberto has more exhaustive measurements of the K181 to follow: My Ken Rockwellien plea goes here: If this helps you, please help me and buy something from Amazon.