Today I had a new pioneer head unit, 4 pioneer speakers to replace the stock door speakers, and a 13 inch screen installed in my 2002 Chevy Suburban at a local shop. I picked my vehicle and was checking my new equipment and noticed that my rear driver side door speaker was not working. I brought it to the attention of the shop and they checked the speaker and told me that the factory amplifier was bad, and that was causing the speaker to not work. They gave me three options:
1. I could have them run a "9 wire" directly from the speakers to the head unit which would in turn disable my factory sub and decrease my sound quality
2. I could get another factory amp somehow and they would install it for me. I don't know how to find this or where to even begin to look.
3. I could let them install a 5 channel aftermarket amp and a 8 or 10" sub in a cabinet for which they would charge me $600.
*disclaimer* - I dont know what a "9 wire" is. I am only repeating what the installer said to me.
Also, I am posting this thread for some fact checking with the hopes that someone will tell me if the diagnosis sounds legitimate. I know very little about car audio outside what sounds good to me and I want to make sure that I am not being taken for a ride. I don't have any issues spending good money for good work or to fix a legitimate problem. Thanks in advance everyone.