I have the 460 mach unit and 2 years a go I had tweeters add a custom 10" JL sub. When the vol. is a 1/4 way bass is grate but I drive her with it 3/4 vol. and bass all the way up. At 3/4" there is like know lows it is all highs. I talked to Tweeters about the problem they told me it was the wiring of the 460 mach and the only wha to fix the problem is the get all new stuff and new wiring. Is this true????
I do not what to replace the unit and all the speakers.
Can I add another sub and amp will that help??

In my Nissan spec V I added 2 12" JL and they sound grate very deep bass. I was looking for the same on my mustang.
Here is a picture of JL sub in the trunk of my mustang. You can not even see it because in matchs the rug the of trunk.
Any help would be nice, thanks

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