Wierd Multimeter readings

[Humpty 10+ year member]

So I just got a used 15" kicker l7

threw the multimeter on ohms setting at 200, and tested each coil.

1 read 4.4ohms and the other read 6.6ohms . So I wire the coils up in parallel and test with DMM and get 2.7ohms.

When I threw the sub in the truck it seemed to work just fine. Didn't sound blown, didn't smell and had some decent bass, I didn't really turn it up loud tho, just want to see if it worked.

When I test my other subs out with the DMM I get the correct readings so its not the DMM.

Is this sub burnt up and waiting to die?

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[maylar 10+ year member]

I'd bet that the 6.6 ohm coil has issues. I wouldn't trust the sub with rated power.

 

[jdawg 5,000+ posts]

unhook it and check it now, i would bet it evened out, sometimes they get weird from sitting and the cone can sag causing a weird reading, i wouldnt worry about it

 

[Humpty 10+ year member]

I checked it over and over and kept getting different readings.

C1. 5.6

C2. 4.8

C1. 5.3

C2. 4.6

C1. 5.4

C2. *5.3

C1. 5.8

C2. 5.4

C1. 4.8

C2. *4.3

C1. 4.9

C2. 6.1

The meter when touch the leads has a .4 difference.

When I measures other sub it reads 3.7 Every single time.

What is going on here?

 

[mat3833 10+ year member]

thats kicker for ya... first sub i ever tested coils on was a L5 12. a friend picked it up in the kicker box(ported to like 41hz no less. fucktards tune so **** high) coil 1 read 5.7 and coil 2 read 2.3 it was supposed to be a D4. he took it back and got a new one, C1 was 2.2 and C2 was 2.4 again, supposed to be a D4...

Matt

 

[Humpty 10+ year member]

so do you think they will be fine? did your buddy just use the subs like they were?

I don't like the fact that the numbers keep changing. This isn't normal is it?

 

[butterMilk 10+ year member]

How much did you pay for the sub.

Id say just bump it and see what happens. You got it used so I assume you cant return it.

 

[rebelfromva 10+ year member]

Bad coil

 

[akheathen Premium Member]

sounds fine to me. take .4 from all your readings. i would bet your other sub is real stiff. many, especially with higher sensitivity are going to vary the reading, especially with any noise/vibration effecting your cone. it gets worse, the lower the voltage and resistance your meter employs to take the reading. on my fluke, i almost always need to hook the leads up and walk back in the quiet to get it to level out to a good reading. you should see what a real good 40watt 8ohm home sub does to the readings. drives me nuts. what i would do to triple check, is to slowly wiggle each tinsel and see if there is a big spike in the reading you can duplicate. other than that, wang away.

 

[akheathen Premium Member]

oh, and a weak meter battery is going to have a good effect on your reading.

 

[Montana]

Plug it into a wall socket and move on with your day.

 

[Julian 10+ year member]

Temperature, barometric pressure, and where the coil is at rest will change the DC resistance of the DMM readings. The 6.6 ohms does not sound right.

 

[Humpty 10+ year member]

How much did you pay for the sub.
Id say just bump it and see what happens. You got it used so I assume you cant return it.

I paid $175 , I got a sealed box the 15" kicker sub, the kicker metal grille and 2 digital power caps. And no I cannot return them.

I had the same thouhts, bump it and see, but if I blow another sub my wife will not be very impressed and it will be rela hard to convince to I NEED another one.

I guess I don't really have a choice tho.

oh, and a weak meter battery is going to have a good effect on your reading

The battery was just replaced a couple days ago. it is brand new

Plug it into a wall socket and move on with your day.

How about you do that and take a video of it!!

SO what does it usually mean when the ohms go above what they should be. The other sub I blew was supposed to be 4ohms but it says 2.3. But that sub sounds like **** when I play it. This other sub I bought sounds fine.

I also retested the coils 3 times this morning. First 2 times it read 4.7 for both coils and the last time 5.1 for both coils.