Had a shop install 2 component speaker up front with 2 coax on the bar both located in the stock speaker locations and also installed a 4 channel JL Audio amp under passenger seat in my 2012 Wrangler I kept the stock single CD disk head unit as it has UCONNECT and wanted to maintain stock look there plus wanted steering wheel controls. The problem is this.

Sound from FRONT Component speakers is OK but the ones on sound bar have virtually zero mid range and when I fade front to rear on head unit, the sound is a night and day difference in that up front I get good treble, mid and base from those speakers and when I fade to the rears I only get slight mid range and zero base out of those coax. The dealer can tell its a problem but still has no idea why and is blaming head unit. Now I also own a 2010 wrangler too with virtually the same deck (no UCONNECT) and those STOCK speakers sound better as I get full range through all 4 speakers.

Why is it doing this? He's saying the amp is not getting those frequencies sent to it from the head unit. How is that possible when it was before and it does on my other Jeep Wrangler.

The other issue which I doubt can be solved is that when I shut off my car the sub plays until the car door is opened. I know I should have bought a 5 channel but I didn't.

Honestly it sounds like the amp isn't wired correctly and if it has crossovers built in they aren't set correctly. If he used bass blockers of some sort to protect your factory speakers they may not be correct either. Sounds like s shotty install that wants more money. I have my 4 channel Kenwood running all my components off my factory head unit and it works just like the factory set up did.

I replaced all the speakers! So no bass blocker. The system is with current 6.5" JL audio gear and their smaller 4 channel amp.

Here is the amp and deck. Speakers are the JL Audio 6.5"

Had the same problem until I filled the enclosuresmwith dampening material, and sealed the speaker to the enclosure. If air is escaping, it will make them sound like crap like that.

Hmmm. All black speaker cable.... Is it possible a + - got mixed up on the back of one or both of the speakers? Just a thought.

Alpine hyperlight,

I can't see that it would make such a profound sound difference. I think I'll video it and send up the video or link.

Little Fella,

Does it matter? I'm not too sure it makes a difference. I am too dumb to have the answer to that.

when you fade to the sound bar (rear), try turning the balance all the way to the left and see if that makes a difference in the sound of the speaker. then try turning it all the way to the right. if there is a noticeable difference, then the speakers may be wired out of phase. easy fix there - just pick one set (left or right) of the rear speaker wires from the amp and sitch the +/-. if that does not fix the problem, then the converter used could be bad, or possibly they tagged the wrong + or - when splicing in.

For example, they took positive from left, but negative for right on the rear speakers and vice versa for the other.

Phase issues can be a little tricky when using a line converter, and a simple oversight on install could cause your problem. The wires change color on some vehicles from the back of the stereo to the actual speaker location, and also the colors change from year to year sometimes. The installer may not have had the most accurate information.

You can take the covers off the rear speakers and use a drill battery to test the speakers. pull the wires from the amp and notice their orientation. touch the wires marked +/- to the battery and the speaker should move out. once you check both speakers and make sure they are coming out of the amp with correct polarity and if you still have the issue, it's time to break into the dash and check the wires that go into the line converter.

These steps should solve a wiring or phase issue. if the problem still persists, then try replacing the converter. make sure it is a good quality converter - and even then 1 out of 7or 8 or so are bad straight out of the gate.

it may be a little time consuming, but it's not rocket science, just a pain in the a$$.

As you will hear, there is barely ANY mid or treble in the speakers on the sound bar.

http://youtu.be/ribluFKCN7s

Hopeing to hear what you guys think. AutoTrendz in Stittsville is going to have a good look tomorrow but they're not sure what it could be until they look. At first they were saying the speaker locations and then the head unit. No way a head unit can do this. Hoping they get to the problem and fix it. They were asking little old me if I knew anything so I am hoping you guys can help out.