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Thank you for your replies. Maybe this concerns more the ALSA developers.
Yes, the STX drives all kinds of headphones and most of them very well but it lacks on low impedance (<32 ohm) models. This is due to the headphone output impedance of 10 ohm on the STX and also on the new STX II. Thus it theoretically is perfect for headphones >80 ohm, although ASUS claims to have it (the old STX) optimized for headphones 32 - 600 ohm (probably by its drivers). Please see: http://www.innerfidelity.com/content/meridian-explorer-case-study-effects-output-impedance/ (an example to explain the "why?") http://www.asus.com/News/knWtTLpnXrb1YaqR/ (see "Headphone impedance") Instead of releasing a headphone output <10 ohm on the STX II (e.g., 2 ohm) to resolve the old STX's well known issue with low impedance headphones (16 - 32 ohm), ASUS seems to address it on their Window driver (only) for the STX II, as mentioned before. Right now, for the old STX, you find on AlsaMixer the following three settings: <64 ohms (which in reality is 32-64 ohm) 64-300 ohms 300-600 ohms Thus I really would appreciate - if possible - an additional 16-32 ohm optimization on ALSA for the old STX; enabling fun playback also on top notch low impedance headphones e.g., Fostex TH-900 (25 ohm) or Audeze LCD-XC (22 ohm). Best regards, Balduin PS: Maybe you are right and buying an additional headphone amp is the only way to go when using an old STX... |
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