Originally Posted by genka
It may not even be the chip. When Bluetooth devices connect, they negotiate the bitrate. Often the low bitrate is intentionally hard coded to improve reliability of the connection. A simple software change could improve the quality. The mp3 player is so inconvenient I'd use my phone anyway. For example, if I have more than one album by the same artist, Zumo wouldn't play the albums in sequence, but arranges songs from all albums in the alphabet order.
I'm no expert, but, I thought the poor audio quality was due to the GPS device connecting using the handset or headset audio profile instead of the higher quality A2DP stereo profile. More of a software issue than chip selection? In any case the 660 Bluetooth does have some issues. Sounds like there are some new devices on the way. There definitely is room for improvement!