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I just installed some aftermarket speakers and what a difference!

For the extra $0.20 per vehicle GM should have used coaxials at least (and

if you have the room why not a big standard size hole for the speakers?).

I wonder though, I have been changing speakers in cars for 20 years and

the stockers still have L shaped connectors but the speakers have 2 terminals

side by side. I realize some cars might use something different but why don't the

speaker guys use the same L shape for their terminals? Seems like a no brainer.

My real question is, I have the base model and swapped the 4 speakers for a

matched set of 4 but the fader has to be R6 - R8 to even hear the rear speakers.

I know they are way back there and don't have an enclosure but is there something in

the radio that cuts power to the rear? I plan on changing out the head unit so I guess I'll

find out...

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Ahh that makes sense. I thought most OEM radios had 2 amps and mixed front to rear off one side.

It would seem both should be the same impedance unless you were trying to do something special

(like have the rear automatically softer in volume). Seems backwards to have 4 ohm in back...

So the new head unit will fix this. Great! Thanks for the info.

I also want to run an amplified sub under the drivers seat. I will remove the Onstar that's currently

there. Anyone know which pin is power to that? It has a 10 amp fuse so should be able to power

the sub (7.5 Amps). Will the car power the Onstar if it doesn't talk to the bus (not familiar with CAN) ?

There are other fuses marked spare are these always powered?

I have an old sub unit like this I will be using;

http://www.clarion.com/us/en/products/2006/audio/speakers/phaze_1_speakers/SRV303/us-en-product-pf_1132912143081.html

Edited by Silver Spark
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