ok I put in a new head unit and speakers all around for awhile it sounded great but then after a few days the bass response on the left side speakers kept comeing and going at random times.

its only in the driver side door and driver side rear speaker bar. what in the world would cause the bass to go away but leave the mids and highs..? Iv never had anything like this happen to me before

 

Are they component speakers? Meaning they have an external cross over?

 

If you have all stock speakers, Your having issues with the internal amp in the Head Unit. Try the old deck and see if that works. (if possible)

 

no they are after market two ways. Rears are JLs and front is Alpines the HU is also an alpine I dont have the factory radio.

you think the wires are shorting out I have no idea where to start since I cant think of what would cause this

 

Found the problem.

Just check the connection on the speaker terminals, before I had components I had the same problem, when I soldered the wires to the speaker terminals I never had the problem again.

 

well this was happening with the stock speakers ill pull it apart and check the wireing I guess.

 

Wires in the door jam.