To be honest, I have not used the J2 myself, but a few possibilities come to mind: 1. The headset might be a little too far from the phone 2. The headset's battery might be low 3. The headset might be applying some sort of DSP/ambient noise reduction algorithm that has gone awry (I'm not sure if you can make any adjustments to that feature with the equipment you're using). 4. You might've just gotten a bad unit. (Can you try the headset with other phones, or other headsets with your phone?)
Do any of these sound like they are on the right track?
-------------------- Chief iPod Correspondent
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