The Chevy HHR is very problematic with the factory door speakers failing. We recently had a customer call us when their driver side front door speaker stopped working in their 2006 Chevy HHR, what they thought was a problem with the factory radio, was actually just a blown door speaker. A quick replacement with some Kenwood 6.5″ speakers, and the stereo was sounding better than it ever did.
This is just another example of solutions we offer at Specialized Car Audio to fix problems with factory stereo systems.