Blown voice coils or cheap dmm?

[k3n12ock]

Well this BTL is suppose to be dual 2 so I metered them. Mind you, this is a cheap ass $3 one from Harbor Freight. So my question is, are the VC's blown or is this just a cheap and inaccurate meter. Or are these possibly Dual 1's?

[Sanitarium]

Well this BTL is suppose to be dual 2 so I metered them. Mind you, this is a cheap ass $3 one from Harbor Freight. So my question is, are the VC's blown or is this just a cheap and inaccurate meter. Or are these possibly Dual 1's?

http://img297.imageshack.us/img297/2618/0817091219.jpg

http://img37.imageshack.us/img37/5135/0817091220.jpg

http://img297.imageshack.us/img297/3959/0817091220a.jpg

Possibly all of the above. Cheap dmm plus possibly dual 1's.

DMM's have a small resistor/wire in them for calibration upon assembly. It's just a small wire soldered into the board at 2 points about an inch apart. Adjustments are made by moving unsoldering this wire and moving it into and out of the board. .. This adjustment was obviously not made on this DMM.

Edit: took out img code to not reply pictures..

[Decaf]

if each is reading 2.9ohms its more likely dual 2 ohm... since it reads 1.8ish on each coil

the coils likely wouldnt read the same if the sub was "blown"

so its the cheap meter

[tacomabanga1986]

some dmm's work diff when battery inside starts to go dead, i got a gb instruments one that does the same thing

[jagblazer01]

good god man...you have a resistance of 1.6???? i have that same meter and mine is only .4. Id say its the cheap meter but if thats the case you would have Dual 1.3s

[k3n12ock]

Thanks everyone. Going to get a hold of a better one in a day or two. Will post new results then.

[Neel]

those harbor freight meters are VERY inaccurate, pickup at least a craftsman or something. Also you have to keep the cone very steady, if the cone starts to move the impedance will start jumping around.

[Boon]

Blah... this comes up about once a month.

The DC resistance of a '2 ohm' coil is usually about 1.4 ohms. 2 ohms is the Z (Impedance) not the Re (DC resistance)

2.9-1.6=1.3 ohms which is pretty damn near for a shitty meter reading something with that low resistance.