what do you think? Is there any difference between AK10 and Beyerdynamic?
I just tried it with the AK10 and the red light is lit at max volume and pressing the middle button for a few seconds doesn't do anything. I think you might be SOL when trying to drive 600ohm cans with this little thing.
The Non-EU version of the A200p does not have a volume limit... does the A&K 10 even have one?
Disengaging the limit on the EU-A200p is a bit more complicated and involves disconnecting everything. Just looked it up:
*) disconnect all cables
*) power on the device
*) lock the keys (i.e. power key in lock position)
*) press the Play-button for about 5sec. Power-LED should flash purple and turn red. Volume limit is turned off now.
*) Power off
*) re-connect cables and power on device
Same goes for re-enabling the limit (LED flashes purple and then blue in that case). Use on your own risk -- listening at high volumes can damage your hearing etc.
Maybe you want to try that on your A&K 10?
Sorry to hear that. I did not even know the A&K version actually has a limitation. Did you ask your retailer? What did the product description say? The A200p non-eu version explicitly states compatibility with high-impedance headphones up to 600Ohm while the eu-version talks about 32Ohm.
Furthermore the limitation is said to be in effect only when connected to a smartphone. Did you try to connect the A&K to your computer?