CK-200 poor music playback quality

Hi, I've just installed the car kit CK-200 (ISO cable version) into my car and I'm very disappointed by the music playback quality.
I have Nokia C7 with the latest firmware (14.002) and I have also updated the car kit firmware into 3.0.
There's no problem with the phone call quality - I would say it is comparable to the other car kits (for example to CK-7W I've had before), but if I want to use it for playing music, it still plays it in "phone call-like" quality. I have tried different players, but no success - still the same low quality.
If I turn the FM transmitter on and tune up the car radio to the transmitters' frequency, I get much better quality then via this car kit (although sometimes it's noisy from other broadcasting radios).
In the product description of this CK-200 they highlight very good sound quality thanks to some DSP technology - I hope there's more than this.
Do you have any idea what might be the problem here?

Hi
The CK-200 is a mono output car kit that is only designed for calls, not music.
If a handset is playing music via the mono Bluetooth channel, this is a fluke, and not part of the design of the handset.
The CK-100, 300, 600 are all stereo car kits with music capability.
The DSP settings on the CK-200 manage the voice vs background noise in the car so the driver can be heard more clearly by the other caller.

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