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Most Bluetooth headsets have 2 different modes. One for listening to music, and one for speaking to a device such as a cellular phone. The type of data being sent is determined by the source (the phone, PDA, etc.). if the PDA does not have an option to change the audio quality level, the headset will assume it is a cell phone, and use the higher-compression audio setting that allows it to do duplex for a microphone, using the one datastream. You will notice the same problem with most headsets like that. The Plantronics version is the same way how you only hear the quality stereo if you use their bluetooth sending unit that plugs into a headphone jack (it looks like a mini silver hockey puck).
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