Ohm question

[dalucifer 10+ year member]

I hooked up both my subs to a DMM and the ohm load is reading .8 ohms. My amp is 1 ohm stable. How much is this going to effect the amp if at all. I tried searching, but i didnt find what i was lookin for, so ne and all help is appreciated. Thanks guys

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[revrider1 5,000+ posts]

Probably not much or at all, what coil configuration subs, are they dual 4ohm?

 

[squeak9798 5,000+ posts]

It won't.

What you measured the DMM is the DCR, or resistance, of the subwoofers and not their "nominal" impedance (which is what subwoofers are rated by...a 4ohm subwoofer has a 4ohm nominal impedance). Their nominal impedance will be higher than what you just measured.

The amplifier will very rarily, if ever, actually "see" the value you just measured with the DMM. It will almost always be higher.

 

[ProjectPat06 10+ year member]

hell temporarily i wired a dual .7 ohm sub in parallel to a hifonics bx2005d.... .35 load right? well obviously its a good amount higher...amp handled it well to my surprise...

 

[dalucifer 10+ year member]

It won't.
What you measured the DMM is the DCR, or resistance, of the subwoofers and not their "nominal" impedance (which is what subwoofers are rated by...a 4ohm subwoofer has a 4ohm nominal impedance). Their nominal impedance will be higher than what you just measured.

The amplifier will very rarily, if ever, actually "see" the value you just measured with the DMM. It will almost always be higher.

good info, thanks squeak

 

[kuijo 10+ year member]

impedance rise

 

[helotaxi 5,000+ posts]

Not impedance rise necessarily but just plain impedance. Just the inductance of the coil alone would cause the impedance to be more than the Re (DC resistance).