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I recently bought a rebranded Innos D9 from China. When I tried using the earphones that came with the phone and the Sony earphones I have, the audio is fine. Really awesome too.

However, when I use a generic Samsung earphones, I hear garbled audio, like the sound is coming from a cave. When I play a video, the voices / speech of people are distorted. Also, I don't think equalizers would fix this because I know how they work. I also tested Apple's Earpods, to the same effect.

I would like to know why this happens. Maybe I could download an app to correct the sound, or at least know what earphones to buy in the future.

Note: The phone has a built-in Yamaha music amplifier that boosts AAC or something, if that information would help.

Another update: Found a relevant thread on XDA and the fix I did was to push the answer button on the Samsung earphones, and the audio was fixed. Do note that for the audio to stay that way, the button should be pressed always. This is not a good fix.

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up vote 1 down vote accepted

The pin layout between the working and not working head phones might be different and hence this behaviour. Though it appears to be simple there is no one standard to which all these manufactures seems to stick with. For instance my LG P500's stock ear phones exhibit this issue with Sony Ericsson SK17i, while Sony's head set played well in my LG P500.

The same problem exhibits when I use my LGP500 head phones in my desktop computer. While doing so, I just pull out the head phone slightly out to solve this issue.

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Pulling the head phones out a little works for me too, in most cases – ndsmyter Jan 2 '13 at 12:11

I have Nokia earphones which I got with my MusicXpress, and they behave the same way. The audio in the human-voice range gets really really garbled.

Over time, I learned how to use it relatively well:

  1. If your earphones have a button (generally for answering calls, etc), when that is pressed the sound comes fine, but when not pressed, sound is garbled. I use a clip to hold the button pressed mostly ;)
  2. If on a computer, you can adjust the balance of your sound output to either 100% left or 100% right. Then the sound comes alright, although sound from one channel is lost, but the vocals come perfect.
  3. Downmix to mono. Not supported in Windows 7 & Linux by default, but there are plugins which can do it (like DFX).
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If we have the same headphones, I figured out o way for them to work for me. The little plug you put into your device has a little button on the top, I had to peel back my case and fully press plug in and now it works. Perhaps you don't have them plugged in enough. Hope this works:)

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