Which Ultrasone, PRO 900 or HFI-780?

Given your preferences, you might be better pleased with the HFI-780, despite the Pro 900 being technically superior. The HFI-780 is more balanced, which makes him handle a wider range of genres better.

However, they are very differently priced. What prices did you find for each?

Well, the HFI-780 is at its regular price, but the Pro 900 is at a good price, below what people usually get them for.

Here's the thing, the Pro 900 are a very impactful set, even moreso than the HFI-780, being more V-shaped and very detailed due to its titanium drivers. They have an emphasized bass presence with higher quality bass, compared to both the HFI-780 and the headphones you listed, and due to the fast drivers, the bass doesn't bleed into the rest of the frequency range. However, the treble is emphasized as well, and you might want to EQ the treble down a bit.

Another thing to keep in mind is that the Pro 900 are one set that benefits a lot from burn in, with some people recommending a 400 hours burn-in. I personally found the biggest differences to occur between 60 and 80 hours, with treble smoothing nicely from that point onwards.

Classic and acoustic is where the Pro 900 don't shine that much, as despite the emphasized bass and treble, they are still bright sounding.

Bottomline, for most of the genres you listen to, the Pro 900 will do a good job, but not for all, and they do have a particular signature of their own.

Well, bass quantity and quality is something they don't lack :)

They have reasonably good isolation and little leakage.

Quote:

Originally Posted by Meh 

Moreso than the M50?

What? Bass or isolation?

I've had the M50's but sold them because of the pronounced bass and recessed midrange. You can go wrong with any of the models on the Op.

I find the Pro 900 to have more isolation.

The box measures 23x24x9 (width, height, depth, measured in cm).

Have you looked into brands beyond Ultrasone? Ultrasone sort of fits a niche since their headphones are very bright, even the supposedly dark hfi-2200 which I owned was quite bright in the upper range and somewhat fatiguing. I've been told they are somewhat intended for acoustic music and this is where they seriously shine. However, you might not like them for metal or hip-hop since those genres typically have more treble energy.