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What did a car with 3 speaker dash and no rears come with?

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All AM FM and AM 8-track stereo E body cars used
a crossover box , and it's the same box weather you had 3 or 5 speakers ,if that's what you are asking. The big difference is the wiring harness , where a 5 speaker car will have a plug for the rear speaker harness as well as a plug for the fader . Those plugs are not found on a 3 speaker harness.
The crossover box takes the left / right stereo channels and creates the 3rd ,center channel . The crossover also sends the lower bass sound to the center dash speaker, and the higher sounds to the outboard dash speakers.

Also , 1 last tidbit , if you are looking for a 3 speaker stereo underdash harness , and all you find is a 5 speaker, You can still use it for your 3 speaker application, however, you MUST have a fader plugged in for it to work, You can even use a C body fader (and harness for that matter) Just fade it all the way to the front speakers and leave the fader out of sight behind the dash .
If you don't plug in a fader, you will get no sound at all out of your radio .


Greg

Wards Classic Car Radio Repair Specializing in restoration and sales of Mopar A B E body radios
We can restore YOUR radio usually in less than 14 days
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http://www.wardsclassiccarradiorepair.com
gregward@mchsi.com
phone 256-852-0955