i just bought 2 12" Volfenhag Subs... They hit and sound great for what i listen too.. but i also know they will hit better for the simple fact that they are used and one of the voice coils in each sub is broken.. ive looked everywhere and cant find anyone to help... Can i fix this problem?? if so how?
Replies (4)
newB on 08/10/2007 23:37:51
if i was in your situation (although i am no pro)
i would first look and see if the coil is good or bad (with a multimeter)
second would be to visually check the coil to see if it is unwound or somehow altered. third test (assuming you cant visually see the coil through the vents) would be to gently apply pressure on each side of the cone (GENTLY and make sure its being pressed equally) and see if it has any grinding feeling/sound.
those are all to check the coil- if you do have a single coil on dual coil subs out- i would replace the woofers. the work needed to do repairs in that situation wouldnt be worth the cost of the sub.
just my .02
-Drew
swez on 08/11/2007 00:12:30
V-hags are really poor quality subs and we do not recommend them for the reason you have mentioned.
As NewB mentioned, you can test each coil set and confirm if all coils are working or not. If you find a bad coil, look for the easy fixes:
1. Binding post and lead wire to sub coil did not break away (Common failure with subs)
2. Press gently on the cone and listen for rubbing or scrapping sounds
3. Test the ohmic value of each coil (If you find an open circuit, there are limited options for repair unless one has the proper tools and skills to repair them (Too expensive to recone)
Finally, power ratings and enclosure designs have a big affect on sub performance and reliabilty of a given sub. If the box is not a good match, even strong woofers can fail. Tell us a bit more about your amp and enclosure.
Amp: Make and model #
Enclosure: Sealed, Ported or Band Pass
Swez
PS V-hags are NOT a quality sub. They look kinda cool, but the quality is just not there!
trunkisloud on 08/12/2007 23:37:52
or couldnt he re-configure his wiring options to compensate for the missing coils?? if we had model numbers of the subs and the amp used we could assist in wiring options to maybe get a little more out of the subs ...true that the subs arent the best out there but ive heard some low end subs do pretty well considering the cost and specs of them...ive had coils go out before but instead of trashing them i just reconfigured the wiring and bam.....back to bangin...
swez on 08/13/2007 09:12:13
If there is only one coil set working per sub, the subs can still be used as is. There's a minor modification that allows for this. (RDO)
Even if the damaged coil is not connected, there is an electromagnetic field generated by the "inactive" or damaged coil. The general idea is to "null out" that out of the equation as best we can. We use a resistor in series with the inactive coils to do this. This is a shunting resistor that absorbs or nulls out the energy created by the inactive coil, as it passes in and out of the magnetic energy field.
If the coil has shorted out, it does not need the resistor. (self-shunting)However, if the coil is OK, but not working due to wire failure, the best you can do is to use the sub as a single coils sub until it finally dies.
Swez
Replies (4)
newB on 08/10/2007 23:37:51
if i was in your situation (although i am no pro)
i would first look and see if the coil is good or bad (with a multimeter)
second would be to visually check the coil to see if it is unwound or somehow altered. third test (assuming you cant visually see the coil through the vents) would be to gently apply pressure on each side of the cone (GENTLY and make sure its being pressed equally) and see if it has any grinding feeling/sound.
those are all to check the coil- if you do have a single coil on dual coil subs out- i would replace the woofers. the work needed to do repairs in that situation wouldnt be worth the cost of the sub.
just my .02
-Drew
swez on 08/11/2007 00:12:30
V-hags are really poor quality subs and we do not recommend them for the reason you have mentioned.
As NewB mentioned, you can test each coil set and confirm if all coils are working or not. If you find a bad coil, look for the easy fixes:
1. Binding post and lead wire to sub coil did not break away (Common failure with subs)
2. Press gently on the cone and listen for rubbing or scrapping sounds
3. Test the ohmic value of each coil (If you find an open circuit, there are limited options for repair unless one has the proper tools and skills to repair them (Too expensive to recone)
Finally, power ratings and enclosure designs have a big affect on sub performance and reliabilty of a given sub. If the box is not a good match, even strong woofers can fail. Tell us a bit more about your amp and enclosure.
Amp: Make and model #
Enclosure: Sealed, Ported or Band Pass
Swez
PS V-hags are NOT a quality sub. They look kinda cool, but the quality is just not there!
trunkisloud on 08/12/2007 23:37:52
or couldnt he re-configure his wiring options to compensate for the missing coils?? if we had model numbers of the subs and the amp used we could assist in wiring options to maybe get a little more out of the subs ...true that the subs arent the best out there but ive heard some low end subs do pretty well considering the cost and specs of them...ive had coils go out before but instead of trashing them i just reconfigured the wiring and bam.....back to bangin...
swez on 08/13/2007 09:12:13
If there is only one coil set working per sub, the subs can still be used as is. There's a minor modification that allows for this. (RDO)
Even if the damaged coil is not connected, there is an electromagnetic field generated by the "inactive" or damaged coil. The general idea is to "null out" that out of the equation as best we can. We use a resistor in series with the inactive coils to do this. This is a shunting resistor that absorbs or nulls out the energy created by the inactive coil, as it passes in and out of the magnetic energy field.
If the coil has shorted out, it does not need the resistor. (self-shunting)However, if the coil is OK, but not working due to wire failure, the best you can do is to use the sub as a single coils sub until it finally dies.
Swez
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