Speaker resistance questions

[Fendermate]

I am a mechanic and not an audio tech. So, I have a couple of probably simple questions that I need answers to.

I have a 1991 Buick Lesabre (mint) and the AM/FM casette amp is crackling and shorting. So, I assumed I need to replace it. Just in case of a shorted speaker circuit, I measured the resistance of the speaker harnesses; LF 4.5 OHMS, RF 4.5, LR 10.5 RR 10.5

The system has 6 speakers where the dash speakers are wired in parallel with the ft. door speakers.

I have two questions;

1- Are these specs normal for a factory system?

2- Would the differences of resistance Front & Rear damage or affect the performance of an aftermarket basic stereo?

Your help would be greatly appreciated.

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[LosIsATool 5,000+ posts]

Typically you want less output on the rears. You don't want to know they are there. Every car will be different depending on who designed the audio.

 

[Fendermate]

Just to let you know, this is a basic factory system, not the Delco/Bose with an amp.

From what I've read and experienced so far, the lower the resistance of the speakers, the easier it is to get them going.

So LosIsATool, you say "You don't want to know they are there". So, I assume you mean 10 Ohms would probably be okay.

The other things I picked up over the years is that the speakers should be matched to the amp and all should be equal if you have one amp powering all speakers.

Also, when I look at speakers for sale most are either 4 Ohm or 8 Ohm.

So, you see my concern. I certainly don't want to blow the amp on a new unit.