Lincoln MKZ 2012 with THX Audio System

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Hello, I was thinking about upgrading the rear deck speakers. The factory system sounds great, but was thinking that new speakers with the system may add some enhanced sound quality. However, I got concerned when I read this on the web.." Any time you replace factory speakers in a factory system that has an amplifier you run the risk of poor sound. The speakers, speaker locations within the vehicle, and the amplifier's performance are all taken into consideration when the audio package is tuned before going into production. You throw off that "recipe" by changing some or all of the speakers."

Is there any validity to the above concern? Has anyone replaced / upgraded speakers with the THX Audio system? - Tony