Silver Spark 1 Posted January 30, 2014 Share Posted January 30, 2014 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... Link to post Share on other sites
TheDrip 25 Posted January 31, 2014 Share Posted January 31, 2014 The radio was designed around 8 ohm speakers in front and 4ohm in the rear. Your replacements are 4ohm all the way around, so there is now effectively twice the current being delivered to your front speakers. Party on. Smikster 1 Link to post Share on other sites
Smikster 10 Posted January 31, 2014 Share Posted January 31, 2014 The radio was designed around 8 ohm speakers in front and 4ohm in the rear. Your replacements are 4ohm all the way around, so there is now effectively twice the current being delivered to your front speakers. Party on. Like a rock star! Link to post Share on other sites
Silver Spark 1 Posted January 31, 2014 Author Share Posted January 31, 2014 (edited) 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 January 31, 2014 by Silver Spark Link to post Share on other sites
Silver Spark 1 Posted February 1, 2014 Author Share Posted February 1, 2014 Well if anyone wants to know the Yellow is power all the time and black is ground on the 16 pin Onstar connector. And you need a 12 foot RCA cable to get from the spare tire to the radio (for the sub). Link to post Share on other sites
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