d1 sub wired at .5 ohm is reading 1 ohm?

[myjaja 10+ year member]

So I have a d1 aq 12" hdc4 and wired at .5 ohm. I already put it in the box and I just started wondering what its sitting at so I checked it. I took out my dmm and it went down to .8 but sits at 1 ohm exactly. Is this normal? I also checked it from the terminal from outside of the box. thanks

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[The_Grimy_One 10+ year member]

Yes, this is normal. With box rise you will probably sit even higher...

 

[myjaja 10+ year member]

Yes, this is normal. With box rise you will probably sit even higher...

oh okay, i was just afraid one of the wires became loose and it only reading one of the coils.

 

[Kangaroux 5,000+ posts]

It's normal for the readings to jump around, my 15 was a dual 2 and when i wired it to 1 ohm it was anywhere from 1.3 to 0.7

 

[The_Grimy_One 10+ year member]

I think you are fine... I mean someone else can chime in, and correct me if I am wrong.

 

[myjaja 10+ year member]

It's normal for the readings to jump around, my 15 was a dual 2 and when i wired it to 1 ohm it was anywhere from 1.3 to 0.7

yeah, its just it freaked me out because its a d1 and i have it wired at .5 ohm but its reading it as 1 ohm.

 

[Z1NONLY 10+ year member]

You are fine.

Average dmm's aren't really that precise down near a dead short, so the .8-1 ohm fluctuation isn't surprising or alarming.

More importantly "nominal impedance" isn't exactly the same thing as DC resistance. (DC resistance is what you were most likely reading)

~1 ohm on a standard dmm could very well be (and most likely is) half an ohm @ some frequency in the sub's intended frequency range.

 

[myjaja 10+ year member]

alright, thanks for all the help guys. Im just relieved i dont have to pull that heavy *** sub out of the box. lol