Improve BT in car?

[lifeuw19]

Perhaps it's here and I can't find it through search. But I'm using my TP in a Nissan Maxima. And the BT is just terrible. I can hear people perfectly, but everyone tells me it sounds bad. Even people with BT who are used to the "BT sound".

Any suggestions in fixing or just improving this? I try not to make too many calls to clients using BT because of this, but it sure would be nice to utilize it.

Thanks in advance...