Problem replacing JBL System with aftermarket system -2003

[Lanew]

Had a new Kenwood DDX9902S system installed in my wife's 2003 T4R, replacing the factory JBL 10 speaker system. It works well until you try to fade it to the rear and then cuts in and out, etc. The installer said it is due to the JBL system and can only be corrected by replacing the JBL with an entirely new amp - at a cost of $1,400 or something.

I expect that someone has dealt with this and has a better answer?

Thanks

 

[unevolved]

He's right from a fundamental standpoint.

Normal audio systems have 4-6 analog channels that run from the head unit to the amp. The JBL system has 2 analog channels (left and right) and a digital channel (think RS485, or something similar) that carries the fade, balance, eq, etc. information back the JBL "amp" that does all the processing and amplification.

The aftermarket "converters" take a normal 4 channels, and turn it into the 2 analog + digital channels the JBL setup is looking for. Except they do it poorly. I have the exact same problem in my JBL-equipped truck. The only way to do it "right" is to remove the JBL amp and put a regular one in its place.

That being said, his $1400 cost does sound high. I would recommend reading up on doing it yourself. Audio wiring is pretty easy, relatively, and can save you a TON of money.

 

[Lanew]

Thanks for this explanation... I "sort of" understand the situation. So I had contacted Crutchfield with my ? and they told me this would work - I gather from what you say that it may not be the answer?

PAC TATO Wiring Interface Install a new car stereo and retain your JBL amp, balance and fade controls, and Synthesis® surround systems (2003-up Toyota and Lexus vehicles) at Crutchfield.com

 

[pjbrownva]

Thanks for this explanation... I "sort of" understand the situation. So I had contacted Crutchfield with my ? and they told me this would work - I gather from what you say that it may not be the answer?

PAC TATO Wiring Interface Install a new car stereo and retain your JBL amp, balance and fade controls, and Synthesis® surround systems (2003-up Toyota and Lexus vehicles) at Crutchfield.com

I had that interface in my 2004 4Runner, and it worked very well. I would agree with Crutchfield on this one.

If you try it, I hope it works!

 

[unevolved]

Thanks for this explanation... I "sort of" understand the situation. So I had contacted Crutchfield with my ? and they told me this would work - I gather from what you say that it may not be the answer?

PAC TATO Wiring Interface Install a new car stereo and retain your JBL amp, balance and fade controls, and Synthesis® surround systems (2003-up Toyota and Lexus vehicles) at Crutchfield.com

It might work, but it might not. Quality control does not seem to be their strong suit (surprise, surprise). You can certainly give it a shot, and do a full amp replacement later if it dies or you're not happy with it.