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Tonycrd 01-02-2012 10:35 AM

That's weird: JBL GTO 6428
Last saturday I replaced the TJ's dry rotted brand X speakers for a set of these JBL 6x4 GTO 6428.

They sound like they are constantly overloaded, even with the volume way down. In fact, they sound even worse then the crap I took out. I have the stock '98 head unit.

I don't get it. :nonono:

the rock99 01-02-2012 03:05 PM

Not sure about Spain, but in the US there are two common impedance ratings for speakers, they are either 4 ohm or 8 ohm, if they don't match your amp, they will not work right.

I-Want-A-Jeep 01-02-2012 04:42 PM

Possibly the impedance of the speakers is much lower than the stock speakers and is causing the stock head unit to clip the signal. It could also have to do with the aftermarket speakers being more efficient than the stockers.

Answer, get an aftermarket head unit that can operate at the resistance of the speakers or get an amp to be able to adjust the signal so it doesn't clip.

Tonycrd 01-03-2012 09:38 AM

Thanks guys... these speakers are only 2 Ohms...


Powerful Performance
True 4-Ohm Topology
Low-impedance speaker voice coils extract more power from your amp for more powerful performance than high-impedance coils do. JBL GTO6428 speakers use a lower-impedance voice coil than a typical 4-ohm speaker to extract the most power possible from all amplifiers engineered to drive loads of 4 ohms or less. And the GTO6428 is compatible with both aftermarket head units and factory-installed systems. Since many factory-installed systems incorporate 2-ohm speakers and include amplifiers designed to drive 2-ohm loads, replacing those reduced-impedance speakers with a typical 4-ohm model will reduce the power output from the amplifier. For the most powerful performance, the GTO6428 makes the best use of any amplifier by providing an optimum 2-ohm load.
Maybe the PO swapped the + and the -, I'll have a better look at that.

I-Want-A-Jeep 01-03-2012 04:27 PM

I don't know what the stock speakers are as far as impedance. My suggestion would be to get an amp for the speakers.

Tonycrd 01-12-2012 01:52 PM

I corrected the +/- swap the PO did... nothing. Tried the speakers in another car, work fine. So I guess the problem is the head unit.

felix225 01-12-2012 09:27 PM

The problem is the speakers are 2 Ohms..which means they are drawing way more power than the stock headunit can provide, which makes the speakers clip and distort..either upgrade the headunit (I would suggest) or go with an external amp (more wiring, more complex install but more flexibility later on).

Tonycrd 02-29-2012 10:40 AM

New(-er) headunit solved the problem, thanks!

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