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Discussion Starter · #1 ·
Hello all, I have a 94 ZJ with the stock Infinity Gold stereo with amp and I am looking to replace it with an aftermarket head unit and new speakers, as well as a pair of subwoofers hooked into an amp.

I'm not too familiar with how the stereo is wired in this car, I guess it has a total of 8 infinity speakers, I assume they all line out into the stock amp then out from there to the speakers? I don't necessarily need to keep the old Infinity amp, I think the new head unit should put out enough power for the door speakers (maybe not?)

Does anyone have experience with replacing this stereo setup, or maybe could point me in the right direction? I've replaced stereos before, but nothing with a pre-existing amp or more than 4 stock speakers.
 

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Yea 8 speakers, but 4 channels. The rear door speakers are 2-way and Chrysler counts that as 2 speakers per side. Same in the front, but the tweeters are in the dash.

You can keep the Infinity amp, replace it, or discard it. If you discard it, you'll need to search for the wiring diagrams and do a bit of connecting work. Its easiest to keep the stock amp, but it's not very powerful. If you keep it, you'll need a head unit with subwoofer out.

I did these speakers in the front door:
http://www.crutchfield.com/s_091165CA1/Focal-Access-165CA1.html?tp=105&nvpair=FFBrand%7cFocal

these rear:
http://www.crutchfield.com/s_136C2650X/JL-Audio-C2-650X.html?tp=105&nvpair=FFBrand%7cJL+Audio&nvpair=FFSpeaker_Size%7c6+1%2f2&nvpair=FFSpeaker_Size%7c6+3%2f4#reviewDynamicContent

Pumps out enough bass for me, but I don't like overdone boomy bass.
 

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Discussion Starter · #3 ·
Alright that makes sense I think. How are the tweeters wired? What I am looking to do is replace the 4 door speakers, and have those going straight into the new head unit for power, with the subwoofer out of the head unit going into an amp for my 2 subwoofers.


Or assuming the factory amp is still good, is it possible to replace the factory head unit and still use the factory amp for door speakers? I guess I need to search a little harder for good wiring diagrams. (Been hard this past 2 weeks, internet has been off and on, working on switching isps.)

Thanks a lot for the info
 

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Yea you can keep the factory amp with a new head unit. You solder or crimp up a new intermediate harness for the new head unit to factory harness connection and you're done. That's what I did. Works decent. When the amp blows, I'm going straight to the head unit. Like this last post
http://www.jeepsunlimited.com/forums/showthread.php?t=393811

To eliminate the factory amp, you'll be cutting and splicing at the factory amp connectors, making connections from the head unit speakers out wiring directly to the speaker door wiring. According to the diagram^

The dash tweeters are wired in parallel with the front door speakers. So you will need to disconnect the dash tweeters to maintain the correct impedance. That's if you get 2 or 3 way door speakers. If you got 4-ohm 1-way door speakers in the front, you could leave the tweeters connected I guess.
 

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Some HU's work well with the factory amp.. so do not.. it depends on the voltage output.. it's easier to leave it but if you get a lot of distortion just scrap it.

Also
Just thought you should know..
You do not need to run a remote wire either way you do it.. Keep or trash the factory amp..
You can splice into the factory amp's remote wire and save yourself some time. Its the Dark Green wire with the Red stripe on the smaller connector to the amp.
Just be sure when you wire your head unit you wire up the remote wire there. If you don't you'll know it because you'll have no sound lol...

You'll probably need this..

 

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Discussion Starter · #7 ·
Thanks for the help, I think I'm pretty set now, I'm probably going to get some 3 way speakers for the doors and just disconnect the factory tweeters, try to keep the factory amp, and the subs with their amp through the head unit.

As for the size of the door speakers, which is preferable, the original size 6.75" or some 6"x9"s? I believe I had 6"x9"s in my explorer and they sounded pretty good.

Some HU's work well with the factory amp.. so do not.. it depends on the voltage output.. it's easier to leave it but if you get a lot of distortion just scrap it.

Also
Just thought you should know..
You do not need to run a remote wire either way you do it.. Keep or trash the factory amp..
You can splice into the factory amp's remote wire and save yourself some time. Its the Dark Green wire with the Red stripe on the smaller connector to the amp.
Just be sure when you wire your head unit you wire up the remote wire there. If you don't you'll know it because you'll have no sound lol...

You'll probably need this..
What is this diagram of? The in/out on the factory amp? Back of factory stereo? Looks helpful.
 

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Yea 8 speakers, but 4 channels. The rear door speakers are 2-way and Chrysler counts that as 2 speakers per side. Same in the front, but the tweeters are in the dash.

You can keep the Infinity amp, replace it, or discard it. If you discard it, you'll need to search for the wiring diagrams and do a bit of connecting work. Its easiest to keep the stock amp, but it's not very powerful. If you keep it, you'll need a head unit with subwoofer out.

I did these speakers in the front door:
http://www.crutchfield.com/s_091165CA1/Focal-Access-165CA1.html?tp=105&nvpair=FFBrand%7cFocal

these rear:
http://www.crutchfield.com/s_136C2650X/JL-Audio-C2-650X.html?tp=105&nvpair=FFBrand%7cJL+Audio&nvpair=FFSpeaker_Size%7c6+1%2f2&nvpair=FFSpeaker_Size%7c6+3%2f4#reviewDynamicContent

Pumps out enough bass for me, but I don't like overdone boomy bass.
Oh so thats where the other 2 speakers are on a 5.9 ? It says 10 speakers and i counted 6, ppl said tweeters in the dash.. where in the dash ?? Then i guess the other 2 imaginary speakers would be those 2 way in the rear doors ? Then what are those 2 small looking speakers on the ceiling rack next to the big ones ?

One thing i dont understand in my 5.9 is the PO removed the amp under the rear seat, and all the wire harness's are like electrical taped.. and then there is a newer head unit in the dash.. I dont know if he wired the amp harness's like you mentioned or what... i do know my sound system doesnt sound as good as our 4.0 laredo's.. Altho the laredo has a brand new JVC HU in it, mine looks older and i dont think its quality as good that could be why it sounds worse
 

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As for the size of the door speakers, which is preferable, the original size 6.75" or some 6"x9"s? I believe I had 6"x9"s in my explorer and they sounded pretty good.
6x9" is superior to 6.75"
6x9 = 54 sq in.
6.75 = 46 sq in.

Roughly. It depends on the surrounds and shell. I noticed the Focals are a true 6.75", using most of the area for cone unlike some other speakers I looked at that waste area with ill designed shells and big surrounds.

Generally the more radiating surface, the lower you can go. The 'throw' counts too. Deeper is better.

Be careful in the doors with 6x9". They are usually deeper than 6.75" and could rub your window. In that case, you'd need to make a bezel out of wood or plexiglass or whatever. You will need to do a little extra work with the 6x9, but it would be worth it.

Oh, and 3-way car speakers are a waste of time. Go 2-way.
 

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A bit off topic...but if you're interested in selling that head unit I would be interested in buying :).

i've heard that the jeep amps are total crap with anything other than the infinity gold system
 

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A bit off topic...but if you're interested in selling that head unit I would be interested in buying :).

i've heard that the jeep amps are total crap with anything other than the infinity gold system
I cant remember the voltage output from the factory HU but I know its very low compared to most aftermarkets. The reason being that the factory HU doesnt have a built in AMP like the aftermarkets. If your HU has a low power mode that's what you want to use. Otherwise it may sound like crap or distort very easily.
 

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Discussion Starter · #14 ·
A bit off topic...but if you're interested in selling that head unit I would be interested in buying :).

i've heard that the jeep amps are total crap with anything other than the infinity gold system
I'm still at least a few weeks away from starting on the stereo, I need to find out why this truck runs rough and misses like crazy after it gets hot, maybe the computer on the firewall.

But in general I shouldn't have any problems with distortion or anything if I am essentially scrapping the infinity gold system? Anyone have a guide or anything for modding the doors to fit 6x9 speakers?
 

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My stock speakers are blown, and I'd love to replace them, but aren't they 2 ohms, and relatively impossible to find?
crutchfield carries a small selection of compatible speakers at reasonable pricing.
 

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is there a way to bypass the infinity amp with out having to re wire the speakers and harness?
Yes... it just depends on how you want to do it. If you get the schematics for the plugs into the amp, you can just wire the appropriate speaker in to speaker out. Then you can unplug the amp and just power them from the head unit, but if you can it would probably be better to leave the speakers powered by the stock amp unless you're getting another one.
 
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