[harry501501]

Got a defective one from advancedmp3players. It had a horrible gargling distortion and it blew my Sony 100AAPs. Thinking they had just quit on me I tried it with my HD650s and similar malfunction, only this time there was a sudden burst of high frequency and i thought I'd lost them too. this was in high gain but nowhere near top volume. Very disappointed. Not sure i can prove it blew the headphones though so not sure what more i can do than complain and get a refund ... and leave a bad review

 

[Mad Max]

If in doubt, always test with a cheap earbuds or so.  By cheap, I mean $1USD Chinese earbuds.  You shouldn't have tried it with your HD650s if you suspected that it blew your Sonys.

 

[apaar123]

what is the maximum impedance for which it can give good power?

 

[shuto77]

Can anyone compare the amp section on this to the new iBasso PB3? I'm actually cross-shopping to two.