okay some guy came to me with a question and i dint exactly know the answer so juess where i turned ck any way he brought me a pyle red label square sub 12"it is a dvc but he blew one of the coils is it posible to only wire one coil one still shows a 4 ohm resistence on the multi meter the other one is an open circut
Replies (3)
swez on 07/22/2006 00:30:37
If the other coil is blown, (shorted out or separated the coil windings, it's best to replace the sub.
If one coil is still good, we can install a shorting resistor across one sub coil inputs and use the sub as an SVC type, 4 ohm sub.
NOTE: When using the shorting resistor method, we actually change the reactive magnetic flux and impedence of the sub. This in turn, changes the operating characteristics of the sub, as we vary the load resistor across the unused coil. (Variable Qtc of the sub can be done in this manner) But NOT recommended for a blown DVC coil.
Swez
PS He may not have blown the coil. Look for a separated tinsel lead on the coil that reads infinite ohms. He may have stretched the sub too much and the tinsel lead may have come loose, but the coil may still be OK.
Test the coil with your meter and wiggle the tinsel leads at the termination lugs and where they go into the sub cone. If you hear some pops and clicks,(meter will change values too) while doing this, the sub may be repairable.
PSS Chances are good, he put too much power to this sub. Over-excursion from excess power, too much bass boost or the wrong enclosure design, will often cause this.
raulbustos on 07/22/2006 02:21:14
well first off just so ya know the model is PLSQ12d by pyle and he had it wired parrelel to 2 ohms with a b250.1 litning audio amp and it was in a ported box .looks like one of those pre fabed boxes ive seen for kicker subs when he brought it to me his complaint was that it stoped bumping when i looked closer at it the fuses on the amp were blown i took out the sub and puleed out the meter and found that only one of the terminal showed reistance so that when i asked yal so maybe this will help a bit ill test the leads tomarro
swez on 07/22/2006 11:13:43
If this failure blew amp fuses, it probably had a voice coil short initially and then the coil wires on that side fried and opened up to give a infinite reading on your meter. Basically, the coil is now an open circuit.
Best quess here are:
1. The amp was clipping badly as it is underpowered for this sub
2. Sub enclosure is not well matched for this sub (too big and port tuning was too high
3. No infrasonic filtering was used
Suggest to your friend he needs some additional education on how to choose and use his gear within the design parameters of the products used. Unfortunately, shooting from the hip on such purchases and usage, can lead to expensive paper weights.
Have you checked the amp out to see if it is still OK?
Swez
Replies (3)
swez on 07/22/2006 00:30:37
If the other coil is blown, (shorted out or separated the coil windings, it's best to replace the sub.
If one coil is still good, we can install a shorting resistor across one sub coil inputs and use the sub as an SVC type, 4 ohm sub.
NOTE: When using the shorting resistor method, we actually change the reactive magnetic flux and impedence of the sub. This in turn, changes the operating characteristics of the sub, as we vary the load resistor across the unused coil. (Variable Qtc of the sub can be done in this manner) But NOT recommended for a blown DVC coil.
Swez
PS He may not have blown the coil. Look for a separated tinsel lead on the coil that reads infinite ohms. He may have stretched the sub too much and the tinsel lead may have come loose, but the coil may still be OK.
Test the coil with your meter and wiggle the tinsel leads at the termination lugs and where they go into the sub cone. If you hear some pops and clicks,(meter will change values too) while doing this, the sub may be repairable.
PSS Chances are good, he put too much power to this sub. Over-excursion from excess power, too much bass boost or the wrong enclosure design, will often cause this.
raulbustos on 07/22/2006 02:21:14
well first off just so ya know the model is PLSQ12d by pyle and he had it wired parrelel to 2 ohms with a b250.1 litning audio amp and it was in a ported box .looks like one of those pre fabed boxes ive seen for kicker subs when he brought it to me his complaint was that it stoped bumping when i looked closer at it the fuses on the amp were blown i took out the sub and puleed out the meter and found that only one of the terminal showed reistance so that when i asked yal so maybe this will help a bit ill test the leads tomarro
swez on 07/22/2006 11:13:43
If this failure blew amp fuses, it probably had a voice coil short initially and then the coil wires on that side fried and opened up to give a infinite reading on your meter. Basically, the coil is now an open circuit.
Best quess here are:
1. The amp was clipping badly as it is underpowered for this sub
2. Sub enclosure is not well matched for this sub (too big and port tuning was too high
3. No infrasonic filtering was used
Suggest to your friend he needs some additional education on how to choose and use his gear within the design parameters of the products used. Unfortunately, shooting from the hip on such purchases and usage, can lead to expensive paper weights.
Have you checked the amp out to see if it is still OK?
Swez
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