CK 15W - bad audio quality

Hi,
I just got a brand new CK 15W car kit. I've installed myself (not too much trouble as my car had another older nokia carkit installed so it was just a matter of cable switching).
I am using Nokia 6120 classic brand new phone.
After 2 days in use, I can tell the audio quality is extremely bad. I can hear very well the other party, but they all complain that they do not hear me.
They say I sound like talking from a barrel.
Really disappointed. Called Nokia today. They have no suggestions other than saying that 6120 is not yet fully tested with CK-15W.
Any other suggestions?
Thanks in advance,
Claudiu

Glad to hear it's not a problem with the 6120c itself
Nokia N95
V 20.0.015
0546553

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Can anyone advise how I can improve the audio quality on Face Time?
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