Cool man you realy helpfull here. I appreciate it very much. So the thing is the impedance on my xonar u1 is only 32ohms if I remember the specs. I can't get a pci or pci-e sound card cause my 2 graphics cards covers all slots
I stay in Pretoria and what sennheisers will you suggest. PC 350 is R1999
Thanks, but don't just take my word for it, look up some discussions on MyBB we've had about headphones.
I got this from the Asus website (
http://www.asus.com/Multimedia/Audio_Cards/Xonar_U1_Audio_Station/#overview)
Xonar U1’s built-in high-fidelity headphone amplifier achieves best listening quality with most stereo headphones (8~150 ohms @ >10mWx2)
The Sennheiser HD 5xx series are all 50 Ohm, so they should work nicely. They were specifically designed for audiophile-level sound quality while being easy to drive. My HD598 even works with cellphones, but sounds much better with the Xonar U3 (same as the U1 basically but smaller) and even better with the Xonar Xense or Essence.
To be honest I wouldn't recommend the PC350 at that price. They do sound good (after some modification I did), but the 555/558 is on a whole other level, and cheaper. You pay a lot for the mic it seems. I'd rather take an HD 558 and buy a cheap clip-on or desktop mic for 100 bucks or so. The only reason I have the PC350 is I got them in a bundle with the sound card. It depends on what your needs are. For best sound quality while not being too expensive, the HD 555 or 558, or the Audio Technica seems to be best, but bear in mind they're all open-backed. They sound better but will bother people around you, if that's an issue. If you want closed headphones that block incoming and outgoing sound, get the HD 380 Pro's. You'll also have more pumping bass, although you won't get that same midrange or massive soundstage and positioning (most important in games IMO). I don't own HD 380 pros but to make matters more complicated, they are like the PC 350 without the microphone, and thus about R700 cheaper..
This is the HD 380 Pro:
and here's the PC350
Edit again: Both are beaten hands-down by the HD555/558 though, in terms of sound quality. Also they're 150 Ohm, so should also work on the U1 in case you're wondering.