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I just bot Pioneer speaker CH26861...4 wires to 2 leads...

I just bot Pioneer speaker CH26861 in-dash for my '68 Chevelle with 4 wires (2 each speaker) - but, my radio is original AM with only 2 leads (+ and -) into the back of the radio. So, do I split the speaker wires up and try to wire the 2 speakers in series?

I didn't get any instructions or wiring diagrams. I don't know which lead on each speaker is + or -, perhaps it doesn't matter? My thought is to run one wire from 'radio hot' to the far left speaker lead; then run a wire from the other lead on that speaker to the inside lead on the other speaker; then run a 3rd wire from the outside lead on speaker #2 down to the negative lead on the radio?

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  • fred878 Jul 30, 2009

    Thanks for your feedback! the new speakers are 4 ohms each, and i'm guessing my original 68 radio is 4 ohms or 8. Question / clarification...at Basic Car Audio Electronics (BCAE1.com), they say 'series' wiring doubles the ohm protection from 4 to 8 - right?

    If so, my plan was to follow their diagram, with one wire from pos radio to pos speaker; one wire neg from that speaker to pos to the other speaker; and one wire neg on the other speaker back down to neg on radio...right?

  • fred878 Jul 31, 2009

    Hello Flagcar! Thanks a lot for helping me here, i'm really new at this. I keep reading I'll fry the amp in the radio if i do it wrong. Finally i see that if i go parallel and drop the impedance from 4 ohms per speaker to 2 ohms "net", i raise the power and clarity of the speakers.

    However, i apologize all over the place...i FINALLY actually took a LOOK at my 68 Chevelle Delco radio, and it's stamped on the back "wire speakers to minimum 8-10 ohms".

    Ohms Law says if you wire in series, you double the ohms impedance (in this case, 2 speakers). So i actually should have bot 2- 8 ohm speakers and wired them in parallel as you said. Now wiring them series to get 4 ohms each speaker to 8, i have to wire series, and this will lower my power and speaker clarity unfortunately.

    It's tought to learn the hard-way!

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  • Master
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If you state what the impedance rating (ohms?) of each speaker is, it would be helpful, but to be on the safe side, I suggest you hook up the speakers in parallel (+ to +; -- to --) .
The car radio is probably for a 4 ohm speaker (most car radios are)
If the pioneers are 4 ohms each, and you place them in series, the amp (radio) will see 2 ohms. That's not a good match for radio or speakers.

To determine which terminal on a speaker is positive and which is negative, follow this simple procedure (I've done this procedure countless times)

You'll need to be able to see the cones of the speakers.
Take a 1 1/2 volt battery (flashlight battery, size C, AA,D; the size doesn't matter - just 1 1/2 volt)
Take the wires from the speaker and connect to battery just momentarily and watch the travel of the cone.
If the cone moves outward - then the wire on the battery + terminal is connected to the speaker + terminal. So you have identified the speaker + terminal.
If the cone moves inward, then the battery + is connected to the speaker -- terminal, so the other speaker terminal is the +.
TRY IT ITS COOL!

Posted on Jul 30, 2009

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  • Master
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I would tie both + from the speakers to the radio, and both - as well. This will give an equal amount of power to both speakers and reduce the chance of blowing a speaker. As for +&- on the speakers, It is usually marked on the black piece right by the terminals. As little power as you are putting to the speakers, it doesn't really matter which way you hook them up, as long as they are both hooked up the same.

Posted on Jul 30, 2009

  • Mike Phillippi Jul 31, 2009

    wiring the speakers in series actually lowers the resistance from 4 ohms to 2 ohms. Wiring in parallel gives you 4 ohms per speaker, or 8 ohms total resistance.

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