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Bavarian Soundwerks' Mobile Electronics Forum
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Old 06-02-2003, 10:43 AM   #1
Furious D
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Join Date: Oct 2002
Location: Canada
Posts: 41
My Ride: RX7
Speaker install

Is there a trick to make sure you get the positive and negative leads hooked up correctly when installing speakers? I know the positive and negative on the speaker but the wires could be questionable. I've got a volt meter, but not sure what should come up. Heard there was like a pop test or something.
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Old 06-02-2003, 11:20 PM   #2
BMWsoundQ
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Join Date: Nov 2002
Location: Los Angeles, California
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My Ride: 2002 330Ci
Based on your question I am assuming that your speaker wires do not have markings on them that you could follow to match the polarity.

It isn't clear from your post whether or not you are connecting your speakers to an external amp or directly to your head unit. Either way here is a technique I saw an installer do a few years ago.

1. Connect your speaker wires to your speaker with your best guess as to which one is positive and which is negative.

2. At the signal end of the speaker wires (ie. where they hook into the amp or radio) disconnect the wires.

3.Take a small battery (~1.5 volt) and connect what you believe to be the negative lead to the negative terminal of the battery.

4.Briefly touch the positive lead to the positive terminal of the battery. At the same time watching the speaker cone. If you have the wires hooked up correctly, the speaker cone should come out toward you. If hooked up backwards, the speaker cone will go in. Make sure you use a small battery.

With a 1.5 volt battery you will get ~.5 watt to a 4 ohm speaker. The cone motion won't be that noticeable. If you use a 9 volt battery, you could get ~20watts to your speaker, which will cause a lot of cone travel and could damage your speaker.

This test should only be used on midrange or woofers. Don't try this technique on tweeters. They are not designed to handle this much current and they could fry.

Hope this helps.
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