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I know this issue is a couple years old now, but was anyone able to find a solution to this 2008 MKX audio issue? RPOITRAS, I have followed your posts on many different forums and I am trying to figure this issue out as well.
I recently bought a used 2008 MKX with the THX sound system. The audio is exactly as you described (Tinny with little bass).
I have now narrowed down the problem to the single amplifier behind the subwoofer in the back right. However, I don't think Lincoln put in a cheap amp on the non-DVD MKX. I think that the physical amp is the same on any MKX with THX, but the actual DSP equalizer is programmed differently on each amp.
Doing some research, I have found there are 3 different amps (all by Pioneer) used on the 2008 MKX with THX. Model numbers are:
There is a 4th model amp, but it is only used on the MKX without THX.
I took apart the back panel on my MKX last night and found that I have the 8L7T-18B849-AE model amp. I called a few Lincoln dealers to try and find a correlation between the amp model number and the DVD feature to figure out which one I need to order, but didn't have any luck.
Going back to what Phil_W said about his 2007 MKX, I believe there was only 1 amp model for the 2007 MKX with THX.
I am thinking about ordering the 2007 model amp and installing it. Looking at the wiring harness and connectors in pictures, it looks like it should fit. I'm not 100% certain this will work, which is why I am checking if anyone found a solution.
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