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Most likely the issue is known as an Impedance miss match. The output from phones and small/cheap mp3 players is very low and is not able to drive the input on your radio. Part of the reason for the lower output is 1) it is not needed for ear buds/head phones. 2) Battery/device run time.
Your best bet will be to find a stereo bluetooth device that offers a line out, which you can, in turn connect to the Aux input on the radio/head Unit.
If you have used the Aux input successfully from an MP3 player or other device like a laptop, portable cd player (for testing only) or even an old personal cassette player, a.k.a. a Walkman, LOL. Understand an Aux input, much like the RCA inputs on a home entertainment system as designed to receive a signal known as a "Line Level", devices with headphone jacks, MP3 players, portable DVD player, laptop, etc. do not necessarily send a signal which meets the "Line Level" spec. Usually they are able to provide a much stronger signal, which can result in "over driving" the input of your Aux Input/radio. You can identify this by the volume control being SUPER sensitive and distortion. Usually you can find a sweet spot which will send the signal at a level the input device likes. However in the case of many phones including mine (an HTC/AT&T 8195) the level is simply too weak.
As a side note some MP3 players, portable DVD players, Portable CD players included a jack labeled as "Line" This is know as a Line Out. Usually this signal is fixed and is the signal designed to send to an aux input.
Hope this helps.
Lee
Last edited by bleerii77; 10-16-2009 at 12:19 AM.
Reason: typos, and gramatical errors
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