I had my subs Memphis PR SVC 4ohms volt tested. One of them read 3.1 store told me they have never seen that except if coil is busted what does this mean?

 

did you buy them new, if you did, did you break them in propoerly, By breaking them in i mean that for the first 10-20 hours you have to keep the volume down at normal conversation volume, it gives the coils a chance to stretch and warm up before being expose to full bass, if you didn't break them in properly then the coil broke or overheated

 

The actual DC resistance of a 4 ohm voice coil will normally be about 3.2 ohms, give or take a tenth. It will not read 4 ohms. You need to seek out a new shop if they do not know this. The rated ohms of a speaker is only a guideline. It's usually an average of the speakers AC impedance throughout the normal part of the frequency range, because the actual measured values vary throughout that frequency range. The AC impedance is when the amp is driving the speaker. The reading of 3.1 is pretty normal for measuring the DC resistance across the voice coil with no amplification. I'm assuming that's what the shop did, otherwise they couldn't arrive at a figure like 3.1 ohms, because the figure would be all over the place during actual use.

Why did they check it? Are you having problems?

 

x2

When you slightly push in the cone (nice and straight) can you hear a scratching noise or feel the coil rubbing? If so, it definitley can be a fried VC and it would need to be reconed.

I would also like to know why you had it checked though.

 

dammit the two of yall need to stop arriving at threads before i do otherwise i have nothing to say

 

I think I like you better that way...Nothing to say! lol

 

Yes I did break it in properly. Reason for checking it was to see if it was wired properly(2ohms at amp plus they are bridged). O and the other sub said it was at 2.something. How much does fixing a VC cost?

 

I thought that Memphis had a 3 year warranty on their products. That's one reason I went with the Elemental Designs. They also carry a 3 year warranty.

 

Call Memphis and ask how much it cost to recone it. Even if you do have a warranty, I doubt they would honor it, assuming its a fried VC.

But as 97f250 said, if its a 4 ohm coil, a 3.1 ohm reading sounds fine. The store was probably just trying to make a sale.

 

Alright well the other sub said 6.something..........

 

Yeah, if both of them are supposed to be SVC 4 ohm, and one read 3.1 and the other 6.x, then something is definatley wrong with one of them (one reading 6.x most likely). There is sometimes a little difference between coils, but not that much.

 

So when bridged and unbridged what should it read?

 

Bridged means combining channels of an amplifier for more power. I believe you are talking about series and parallel wiring maybe?

If so, when the subs are wired in series, you should get a reading of around 8, and when they are wired in parallel you should get around 4. Give a few tenths of an Ohm or so.

If the shop tested each sub by itself (they werent wired together) then they should have gotten almost the exact same reading on each sub. If not, something is wrong with one of them.

 

Yes they should be wired parellel. But I think something is work with one of them since one expands futher(when on). Plus when I put my finger on one it pushes harder than other. Can it be heard when a coil is busted?

 

Refer to Brypink2's reply #4. You probably have something wrong with the voice coil or spider. Since there's such a disparity in the ohms readings, sounds like a voice coil.