I owned the HFI2400.. basically the same thing than the 2200. Not bad and and a good value for the money in Ultrasone family. Don't expect any Hifi sound though. It's afun V-shaped heaphone with a mid bass hump ( bit it doesn't overwhelm so much the whole range and the low mids) ,recessed mids ( but IMO less than an ATH-M50.. I'm a ATH-M50 hater  ) , and sparkly Ultrasone Treble. Spakly but not as metallic than pro900 or 750.  it's a kind of typical Ultrasone but too extreme.  a good choice to discover the brand and a very very good heaphone for films and maybe for games ( I'm not a gamer) . i would pick the HFI2400 over any DT770  for example.

Dunno anything about the 2500/2900.. Some people are fan , and some other hate it.

The HFI780 seem to be a good option too and I've heard good things about the pro550 ( If I remember well Gelocks who are here on Changstar adviced me this one ) or the DJ1 pro .

I've experienced two Ultrasone I've really appreciated. The Signature pro and the Edition 12.

Ultrasone seems to create a mass of crappy headphones and put some better ones randomly in the entire line up   

The PROline from Ultrasone tends to be very sharp and sibilant, with it all culminating in the PRO 900 / 2900 which is undoubtedly the most unpleasant hifi headphone I've ever heard. Basically the headphone equivalent of an LRAD sound cannon. It has a cult following because it works semi-well with heavy synthesizer music.

The PRO 450 and 550 have some fans, but I never really felt compelled to listen beyond a cursory few minutes. I haven't heard the PRO 2500, but saying "it's the best of the PROline" is like saying "genital warts are the best venereal disease" in my opinion.

The HFI line is much more listenable. I've had the HFI-2200 (same as the HFI-2400 more or less), and it has a warm and pleasant kind of sound. Not technically proficient, but likable. Little warm butter dripping down a stack of pancakes.

Unfortunately that's about it for their lower end models. With Ultrasone it's all about the ridiculous price tags and high-end materials of their top range models. Even then you run into problems.


The Signature line is the best thing they've ever done, and the Signature Pro is the closest Ultrasone will likely get to a reference headphone. Signature DJ is similar but more 'fun' sounding I guess. Utilitarian build quality, moderate comfort (too much clamp), but good isolation.

The Edition line is hit or miss; I actually really like the Edition 7 (same as Ed. 9) and the infamous pariah, the Edition 10. Of course they're stupidly overpriced and the build quality is surprisingly bad in places---like using materials that react to oils in your skin by instantly turning brown---but the Liquid Cobalt + Ed. 10 was shockingly great sounding. The Edition 8 however is just way too sibilant for my liking.

As aside:

Ultrasone's biggest problem in my opinion is their variability; if people think Beyerdynamic offers a grab bag in that sense, Ultrasone is all the more so. I owned three different Edition 8s, and each one sounded progressively more sibilant. Hearing two Edition 9s side-by-side yielded even bigger sonic differences. While most people hear a sonic mess with the Ed. 10s, the one I owned for a while was actually pretty good.

Even the S-logic technology they use is a crapshoot: with some ears it just doesn't work. For those who can hear it though, it's one of Ultrasone's [few] really good strengths. The Edition 10 I owned had such an incredible since of presence, like instruments were really "there" in physical space. Really it was the only reason I held onto it for so long.