HD 558 + Xonar DG ? HD 558 is $149.99 (refundable)
Beyerdynamic DT-770 PRO 80 OHMS + Xonar DG ? ($229.99 non-refundable by the seller).
Edited by SKilleT - 2/1/13 at 12:43am
It sounds like you're getting distortion on the output, rather than it being a problem with the headphones.
Was there any reduction in the distortion when you turned off the enhancements?
Although I've not had any experience with the senn 558, I used to have the 555 (the older version of the 558) and had no issues whatsoever with any distortion.
@Billson: I want to have a good bass an addition to clarity....
@calboa, when I turn the enhancements off the voice ONLY will get distorted. But if I turn base enhancer(increase the bass a little bit) the bass will distort and the voice will be distorted even more !
I edited my post and made it much shorter.
Sounds like it's an issue with the sound card rather than the headphones, especially if you've had the same distortions with two different pairs.
If you're using the on-board sound, I'd say that getting a sound card would be your best bet, and if you're still getting distortion after that then I haven't got a clue what's happening.
Looks like you've deleted much of your original post so I'm not sure of the details of your situation. 70% volume on what (what are you plugging them into)? BTW, no its not normal, but one man's 70% volume might be 80db and another's might be 110db so who knows. I need more info to help you.