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I've tried a lot of headphones. As I do all the production on my own music, I need to listen to the subtle differences between every set of speakers and headphones I can. From the first time I used these headphones, I was blown away. The clarity was just incredible, things I'd never noticed before on other headphones or speakers suddenly became crystal clear. I've listened to a huge variety of music with these including jazz, metal and classical - it reproduces everything perfectly. It's even across all the frequencies, so they can be used for mixing, but for the casual listener this means that there's the perfect balance of bass, mids and treble, so you hear it as the artist intended.
They are padded and after a short while it's easy to forget that they're even being worn. I've worn them all day on a few occasions, and never had any kind of discomfort. Despite being large and the cups covering your ears, they are even extremely comfortable when laying down in bed.
They go to a volume far higher than a comfortable listening volume, and can be used as portable speakers if you put them around your neck and turn the volume up, although too much volume could be risky and blow them.
There is quite a lot of 'leakage', so if you put these headphones on anybody nearby will be able to hear your music / TV show / podcast / video clearly, which was an issue in my house when I wanted to make music and other people wanted to sleep (the doors in my house don't block sound out at all).
The cable itself is 5m long, which is useful if you want to listen to music from a desktop computer and move around the room, for instance. It isn't physically built into the headphones, so it can easily be replaced if you want to connect to something other than 3.5mm jack, or if it breaks, as mine has. The one that came with it has gold-plated ends and the 5m part is made of Kevlar (so it can take a bit of a beating), but the end connection of mine has stopped working.
The aesthetics are nothing unusual by any means, the design is simple and effective. I would happily wear these around town if I wasn't so protective of my 'baby'.
-Value For Money-
At around £120, they're not recommended if you listen to just a couple of songs a week. However, if you can justify spending this much on headphones, you will not be disappointed.
Sennheiser has extended its range for the audiophile: enthusiasts of classical music will want to try the open-back HD 590 Prestige. Using selected quality materials, these headphones have been designed with unadulterated listening pleasure in mind, making them the top model of Sennheiser's 500 Series. The HD 590s feature large-surface "Duofol" diaphragms, a special diaphragm consisting of two foils welded together to reduce standing waves to an absolute minimum. A new transducer orientation ensures better localization of sounds and a superbly natural sound reproduction.