Klaatu wrote:

Anybody know where the audio amplifier is on a 2007 Chevy Cobalt?


Have you asked the local dealer? I never had problems getting
answers from the parts/service department. Some '70s Delco car radios
had the output transistors mounted on a separate heatsink, that was
mounted to the inside of the firewall. They had a pair of TO-3
transistors, and a six wire cable to the unit. People would bring them
into the shop for service, without the outputs and insist we should just
use the outputs from another radio. We refused, because of the
percentage of bad output transistors left in the cars meant extra work
for us.