D4 sub is reading 3 ohms each

[GreekBrotha8 10+ year member]

So I purchased a used alpine type x a while ago and put it in my girls truck for a few months and it sounds great. I took it out of her truck because i wanted to sell it, so i bought a cheapo dmm and checked the coils and they are reading about 2.9 each. Is this a problem? I know that they are hardly every exactly what they say but a whole ohm off seems like a lot. Don't wanna accidentally rip someone off lol.

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[ThatChevyGuy 5,000+ posts]

So I purchased a used alpine type x a while ago and put it in my girls truck for a few months and it sounds great. I took it out of her truck because i wanted to sell it, so i bought a cheapo dmm and checked the coils and they are reading about 2.9 each. Is this a problem? I know that they are hardly every exactly what they say but a whole ohm off seems like a lot. Don't wanna accidentally rip someone off lol.

as long as they two coils dont differ too much from each other i think you would be fine.

 

[TaylorFade 10+ year member]

Nvm.

You're good

 

[GreekBrotha8 10+ year member]

Awesome. Thanks guys

 

[Beatin' 10+ year member]

how is this OK? A whole ohm is off.

It will affect the amp. 4 coils paralleled into a monoblock would be .75ohms. That seems to be a big problem.

 

[mazdakid 5,000+ posts]

He only has 1 sub so he doesnt have 4 coils.

Even if he had 2 subs then hed just have to find an amp stable down to .75 if thats how he chose to wire it.

The dmm could be off a bit too. Touch the leads on the dmm together to see what it reads before trying it on the sub.

 

[Satyr]

You're measuring dc resistance with the multimeter- not impedance. So 2.9 Ohms DCR suggests you're still in the 4 ohm impedance range.