Subwoofer issues

[Cataldo04]

I am using a line out convertor in my 2009 grand Cherokee and it worked perfectly for around two weeks and then suddenly stopped I have the amp hooked up to an eight inch kicker slim sub in a kicker wedge box I hooked the power and control up to a switch because for some reason the amp would not power off but this worked fine for the duration of time. Recently the Sub stopped working and would only work for a second when it was switched on, it then works again about 5 minutes later but sounds terrible and echoey. I have tried rewiring the LOC and also attempted to check the subwoofer with a multimeter and it measured at 4.1-4.2 but never settled at a single number. Does this sound like a blown sub or possibly a different problem and does anyone know a solution here?

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[Cataldo04]

The subwoofer and amp are both about 2 years old and worked fine in another vehicle issues only started about 2 weeks after changing vehicles

 

[1aespinoza 10+ year member]

5 minutes later but sounds terrible and echoey.

In my experience, the echo sound is a result when only the positive pin in the RCA makes contact. The negative in the signal may have come off somewhere along the chain. Check from where you spliced onto the speakers, all the way to the RCAs into the amp.