This customer was looking to upgrade the sound in his Ford F250 superduty , but wanted to retain his factory Ford Navigation and Sync system. So we opted to use a Cache Line output converter to feed a clean audio signal from his factory stereo into our new Kenwood Excelon 5 channel amp which was used to run new 5×7″ speakers we installed in the front and back to replace the ridiculously cheap factory ford speakers.
And we used a custom subwoofer enclosure to fit behind the rear seat which now holds two 10″ subwoofers which replaced the original tiny 8″ sub that came stock.
This was a nice and clean example of how to properly upgrade a factory system that is totally stealth. everything we installed is cleanly hidden from view, but now when you turn up the stereo this thing really gets down and will shake the fillings out of your teeth!