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Topic: How to check speaker ohms |
George Kimery
From:
Limestone, TN, USA
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Posted 6 Mar 2019 9:14 am |
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| I have a cheap multi-tester that has an ohms section. The lowest setting is 200 ohms. I connected it to my 4 ohm JBL-D130 and it read 3.6 ohms. I connected my 8 ohm TT-12 and it checks 5.5 ohms. I know ohms can be approximate when measured. I just need to know if my cheap multi-tester can check ohms by just connecting to the speaker terminals or is a more sophisticated instrument required. |
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Fred
From:
Amesbury, MA
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Posted 6 Mar 2019 9:25 am
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Speakers are AC devices so the rating is for AC impedance. The impedance varies with frequency. Your meter reads DC resistance and the readings you’re getting are pretty normal.
Fred
Last edited by Fred on 6 Mar 2019 9:26 am; edited 1 time in total |
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Paul Arntson
From:
Washington, USA
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Posted 6 Mar 2019 9:26 am
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Sounds like it's working right. The ohm readings measured this way should always read a bit lower than the rating.
_________________
Excel D10 8&4, Supro 8, Regal resonator, Peavey Powerslide, homemade lap 12(a work in progress) |
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George Kimery
From:
Limestone, TN, USA
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Posted 6 Mar 2019 10:08 am How to check speaker ohms
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| I checked with the speakers not connected to an amp. Should they be connected to an amp so they are "hot" when checking? |
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Paul Arntson
From:
Washington, USA
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Posted 6 Mar 2019 10:41 am
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Nope. You get better readings when disconnected.
Matter of fact, never try to check ohms on a powered up circuit. Best case the ohm meter will get confused, worst case it will blow it out.
_________________
Excel D10 8&4, Supro 8, Regal resonator, Peavey Powerslide, homemade lap 12(a work in progress) |
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Gary Jones
From:
Mount Vernon, Wa
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Posted 6 Mar 2019 12:38 pm Measuring Speaker Impedance
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| The rule of thumb is to multiply the DC resistance by 1.3 |
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George Kimery
From:
Limestone, TN, USA
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Posted 6 Mar 2019 2:00 pm How to check speaker ohms
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| Gary, are you saying I should multiply the ohms measurements by 1.3 ? |
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Gary Jones
From:
Mount Vernon, Wa
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