I don't think I've once ever installed a radio/speaker setup and had my A/C not work afterwards. Sounds to me like whoever installed the setup didn't know what they were doing.... If you were to have new speakers installed, expect to not run into this problem unless you have the same guy install yours as did the gentleman's at the dealership.
Second, speakers are not what make the difference in these cars. The stock speakers are more than adequate. The addition of a sub is necessary for those who wish to add a little bump. The lack of sound quality from the factory base setup is a result of a sub-par head unit. Replace the head unit with a quality double-din, add a sub woofer/amp and I promise your system will sound worlds better than the service guy you spoke with.
Second, speakers are not what make the difference in these cars. The stock speakers are more than adequate. The addition of a sub is necessary for those who wish to add a little bump. The lack of sound quality from the factory base setup is a result of a sub-par head unit. Replace the head unit with a quality double-din, add a sub woofer/amp and I promise your system will sound worlds better than the service guy you spoke with.
