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impedence check

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=14396
Printed Date: May 13, 2025 at 10:07 PM


Topic: impedence check

Posted By: dkiley
Subject: impedence check
Date Posted: June 03, 2003 at 10:34 AM

Let's say you've forgotten if you bought a dual 4 ohm or a dual 2 ohm sub. No markings on sub. I thought by connecting the leads of a multi-meter to the speaker leads it would tell me, but it came up 0 ohms. I'm sure this is an easy one for you.



Replies:

Posted By: esmith69
Date Posted: June 03, 2003 at 10:48 AM

make sure the meter is set to test for resistance, and if it's an analog meter make sure it has a working battery in it.  All you gotta do is test the positive and negative for each voice coil and you should get something like 2 or 4 ohms.



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Ethan
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"Patience, persistence, and perspiration make an unbeatable combination for success"
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Posted By: dkiley
Date Posted: June 03, 2003 at 2:37 PM
OK, Meter set to test for Resistence(Rx1). Zeroed the unit to 0 ohms. Brand new battery. One lead to one terminal, the other lead to the other terminal, (polarity doesn't matter). Result...0 ohms on a test speaker that I know is rated at 4 ohms. Same results with a different meter. What's up?



Posted By: LittleBill
Date Posted: June 03, 2003 at 9:56 PM
when checking resistence with most meters u need to actually move the red terminal wire into the plug to left of the black one , not on the right but to the left



Posted By: dkiley
Date Posted: June 04, 2003 at 12:26 PM
Got it. Crap meter=bad readings.   Good meter=correct readings


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