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Posts by ClieOS

 Really doubt that, given I have build some adapter myself and there isn't much that can go wrong with those things. If I were in the same shoe, I'll check for DC offset on the source first.
 That should be a 2.5mm TRRS balanced plug for A&K's DAP. Those two Lunashops links above are the right adapter for you.
 The balanced version comes with 2.5mm TRRS IIRC? If so, this will work: http://www.lunashops.com/goods.php?id=5221 If is easy to convert balanced back to single-ended, just short the ground for both side together and you are done. p/s: here is the AE link for Lunashops, but as you can see, it is more expensive: http://www.aliexpress.com/store/product/4pin-2-5mm-Female-Silver-Plated-TRRS-Balanced-AKR03-Layla-Angie-Earphone-To-3pin-3-5mm/319162_32654559212.html
 You can get a balanced to single-ended adapter from Lunashops. I reckon by the time to resell it, a balanced version might hold better value.
 I would have just used some tissue or some light sanding. Applying solution to socket might increase the risk of shorting-out
 The DAC has no bearing on this matter. It is the USB receiver that determines whether it will work with your smartphone or not. E07K uses a Tenor TE7022 as USB receiver.
 Try this: take the opamp and buffer out, find something to polish and clean the socket as well as the pins on opamp / buffer.
 Not for about 3 yrs now.
 The USB receiver are different between E7 (PCM2706) and Q1 (Bravo SA9023). However, given both USB receiver should support USB Audio Class 1 without any problem, there is still a chance the Nokia might work.
 That will be more of an IEM than an earbud. Besides, so far the feedback I have seen seems to pointing to a less-than-average sounding earphone.
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