1995 s10 blazer 4 doors stock speakers question
 

Hi,

Pick up this blazer for the kids. It only has front passenger speaker working and a stock Delco cd HU. As far as I can tell, speaker system is 4x6.5" in doors and 2x front tweet in dash. I pulled and tested non-working drivers side door speakers and they are opened. What confused me is back one is marked 9.5 ohm and front is 4 ohm? Diagrams I've seen has tweeters in parallel with front doors. The vehicle shows signs of previous audio mods, guessing a rear amp at some point. Aside from taping into rear speaker wires, harness looks intact. I can't rull out some speakers were replaced and someone bolted in whatever they had on hand that said Delco. Can anyone tell me the impedance of the stock speakers all around? I'm planning to get 4 cheap speakers and wrap up this project quickly. Hopefully less than $50. Your help will be appreciated.
https://cimg2.ibsrv.net/gimg/blazerf...cf77319845.jpg
Both Delco, but front is marked 4ohm, rear 9.5ohm.

I think they used the 9.5 in the back for a deeper sound.

edit:

the deeper sound is what creates a more surround sound, with the mids in the doors and vocals more on the dash. I need to have all my speakers working, drives me crazy when ones out, because that all I focus on, the lack of sound from that space lol...

My truck would drive you nuts, then! The rear door speakers are blown, as are the ones in the dash. All I've got are the two front door speakers!
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I ended up getting 2 pairs of cheap 4ohms. Sounds ok, for $40 worth of speakers and stock Delco head. I barely got the screws of 6.5" speakers to bite into the OEM plastic ring.

I think the Kenwood speakers I replaced my oem with were 5.25", in all 4 doors. Then Pioneer 4x6's in the dash where the tweeters and speaker brackets were. Sounds good.

I used Crutchfield for sizes, then googled part numbers I wanted to find the cheapest price.