That article is highly inaccurate. The speakers in the dash are NOT tweeters to start out with. They are simply 3.5" "full range" speakers. As are the ones in the rear deck. The front door speakers are NOT 6.5" speakers. They are significantly bigger and are only for midbass. The rear speakers are full range speakers as well. And it is NOT a 5.1 surround system. 5.1 surround systems are for theater useage and contain the 5.1 information within the video data. If you have the hard drive system you have no way to watch video and there is no 5.1 decoding available. It does say Dolby Digital and DTS surround but these are manipulated sound from standard 2 stream sources. Not true 5.1. 5.1 includes decoding which allows for hearing differences from front to rear so you can hear something running by you for instance. It does have time alignment built in but this is far from what is considered 5.1 surround.
If you want to improve the bass you will need to add a powered subwoofer that is better than the one in the car. I assure you my cerwin vega sub pounds... And was like $300. The one I have mounts where the spare tire goes.
Beyond this you are on your own. You can remove the rear deck to get to the speakers but I believe requires removing the back seat. There are videos on Youtube showing how to pull off the rear deck on a sedan. A coup should be similar.
Installed a K&N cold air intake on my 2012 cts3.0
followed instructions everything came together perfectly but after a few days got these two codes. Never had issues installing a cold air intake before so I'm pretty confused at the moment.
P0099: Intake Air Temperature Sensor 2 Circuit...
Hi guys & gals,
I've had this 2009 CTS a couple months now. Still finding out about it's eccentricities. When changing the air filter I found it covered in oil. I then found oil in the throttle body intake. Mechanic replaced PCV valve & hose. After maybe 200 miles I still have oil in...