The Teac A-H01 requires an audio driver, otherwise the sound becomes watery. Teac hasn't released a driver since Yosemite came out.

Are there any workarounds? It seems like USB external sound is fairly standard, so perhaps there are alternative drivers available?


I will just copy and edit an answer to a different question but I believe it still applies here:

This problem is probably due to kext signing introduced with OS X 10.10 Yosemite. With it you can't run any unsigned drivers and old one is probably unsigned.

You might try to disable kext signing if you want to use the driver. Make sure you absolutely have to do it and you don't have other options since this change is system wide and system is becoming less secure after that.

In Terminal:

sudo nvram boot-args="kext-dev-mode=1"

And reboot. Then try and report if driver is working.

To go back to kext signing put this in Terminal:

sudo nvram boot-args="kext-dev-mode=0"

And reboot.

P.S. I have become interested in the DAC and now I see it has Optical Input. So other workaround might be just using miniToslink to Toslink (or just normal Toslink cable if your Mac is a Mac Pro)

  • 1
    this works perfectly. thanks! I'm worried optical would be a little more damage-prone (since it's for my "docked" macbook). – tedder42 Dec 29 '14 at 1:49

I have same issue, contacted Teac support and recieved the following

Thank you for contacting TEAC-Audio.

Our engineering department is currently working on this issue. Please be so kind to check our webpage periodically for further info, or a possible driver update.

Thank you for your understanding.

MfG / Sincere Regards Jürgen Customer Support TEAC-AUDIO Europe Liegnitzerstr. 6 D-82194 Groebenzell / Germany Tel. +49-(0)8142-4208 141

  1. Disconnect your TEAC USB cable.
  2. Go to /System/Library/Extentions, and remove the existing TEAC kext directory, like this: sudo rm -rf TeacUSBAudio.kext
  3. Reboot.
  4. Re-install the driver, called TEAC USB HS Audio KEXT Install Package 273.4.2.pkg at the time of this writing.
  5. Reconnect your TEAC USB cable.

I was experimenting same issue

This work for me... just need some translation with google translate http://teac.jp/product/ud-h01/faqs/

  • Your answer would be more useful to others if you could actually summarize the steps you did in english. – nohillside Dec 27 '14 at 14:38

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