How can you tell if you have THX sound in a 2003 lincoln ls?

I bought a 2003 lincoln ls and noticed that there were two subwoofers in the near the back window. This seems like the thx sound but there is not decals on the speakers to denote this.. Does any one have any idea?|||I am reasonably sure the THX only comes with the navigation system.|||The best way to tell If you have THX (theater) sound if your not sure is to test it. Sit in the driver seat like you normally would when driving. Lean over the the center of the car so your somewhat centered in the car. Put some music in that has a lot of variance like rap or hip hop. You should be able to hear seperate sounds coming from different speakers and the music sounding like its moving from one speaker to another. If so then you have a THX sound system.





Hope this helps you out.