Question about Jl Audio 12W7 Car Subwoofer

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Locked up sub-woofer cone won't move?

I have a 15'' sub-woofer that locked up and I was wondering if i could reverse polarity to unlock the sub-wooferhow do i fix if not

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In theory your idea would work, however you risk damaging your amp by reversing polarity and the positive and negative wires from your head unit are low voltage so they wont provide enough current in reverse or normal polarity to free the cone of your sub. but here is something that you can try that is similar in concept.

Take a positive lead from your head unit and wire it to the negative of your sub. Now ground the positive terminal of your sub to the vehicles chassy using a wire. This creates a 12v-14v reversed polarity current that should be strong enough to (POP) the cone so to speak. hope this helps

Posted on Sep 27, 2009

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Hello, I have the same problem with my 12w7. So what you are saying is to take a positive wire from my head unit which is the (power wire?) or ( speaker wire?)

Posted on Aug 28, 2011

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1 Answer

I have AIWA NSX-RV85. The sub-woofer surround tore leaving just the cone. When I play, The woofer just makes a rattling sound coming out of vibrating cone.Any advise on how to fix my speakers.Thanks


Refit the rubber, you can find itbon eBay, its called reconing actually in this case the cone is the inlybpart wich you dont want to replace... The rattling is beingproducer due to the fact the rubber normally holds the cone ibto positionering over the coils. This rattling is not good can defect your cone. So dont play it roll you got a new rubber fitted!

Nov 08, 2016 | Aiwa Audio Players & Recorders

Tip

Using Proper Speaker Polarity


Sound system speakers have standard polarity which is indicated either with a "+" or a "-", or with Red and Black colors near the speaker terminals. This same polarity marking is also found on the sound system amplifier section. Most speaker cable has a polarity indication; either color coded, or a physical difference in the wires. Reversed polarity results an obvious decrease in bass, and a hollow sound in the mid range frequencies. If your speaker cable has no obvious polarity indication, you can check the polarity as follows; connect a 9V battery to each speaker cable for no more than about a second; long enough to see the woofer cone move. When the + battery terminal is connected to the + speaker lead, the woofer cone will move out. When you have this situation, label the positive speaker lead, either with tape, or by tying that wire in a simple knot. Make sure both cables are checked.

on Oct 06, 2010 | Audio Players & Recorders

1 Answer

I have to replace a sub in a jbl encounter and the wiring is yellow and orange. Which is pos, and which is neg?


Use a C or D size battery. Get two pieces of wire. Strip each end. Wire one end of each to the sub. The other ends you will place one on the top of the battery and, one on the bottom of the battery. If the cone moves outward, you have the correct polarity. If the cone moves inward(toward the back of the speaker) then you have the polarity backwards

Jun 28, 2015 | JBL Car Audio & Video

1 Answer

Mackie 15 inch replacement speaker


To determine polarity of a sub, take a 9 volt battery and two one foot pieces of wire. Connect each wire to each terminal on the sub. Then touch one wire to one side of the 9 volt battery terminal and the other wire to the other side terminal. If the subs cone pushes upwards that is the correct way to hook it up(in phase which is normal). If the subs cone pulls down, is is 180 degrees out of phase. I hope that this answers your question.

Jan 14, 2014 | Insignia Car Audio & Video

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I have velodyne hgs15bg powered sub.. After a prolonged hard run, it developed a rattle at mid to higher volumes. what went wrong ??


You possibly ripped the woofer cone or welded the voice coil - something mechanical. There's only one thing in there that moves on purpose.

Mar 03, 2011 | Velodyne HGS-15 Subwoofer

2 Answers

I have a set of cerwin vega AT15's my dog decided to put his paw through the one surround and puntured the paper cone I need total 15" woofer replacements or repair. or I need replacements I can buy and...


Ebay sell Cerwin Vega Surround (rubber bit) replacements. If he has ripped the cone too, appart from replacing his back legs with wheels (joke!), contact Cerwin Vega directly and they will send you out a new "driver". These are easily fitted at home by any one with a screwdriver

Sep 02, 2010 | Audio Players & Recorders

4 Answers

I cant sem to wire it to 4 ohms because the terminals are right next to each other and i have no clue which 1 is which voice coil?


test with a digital multimeter set to ohms. if you don't have one of those laying around grab a 9 volt battery and run wires from the 2 terminals on the battery to 2 of the terminals on the woofer. if the woofer pops out you are said to be "in phase" (even though it has more to do with polarity that phasing but regardless) which means the positive from the battery is on the positive of the woofer and the negative is to the negative. those 2 terminals on the woofer are a single coil and obviously the other 2 terminals are the 2nd coil. now depending on what impedance each coil is will determine how you have to wire it to be 4 ohms unless they are 4 ohm coils which means you just use one coil and it will be 4 ohms on that woofer.

Aug 18, 2009 | AudioBahn AW1205N Car Subwoofer

1 Answer

Amp not working properly


yes that is the cause sorry..i have done it before when i was younger a few times thats how i know..sorry man

Dec 05, 2008 | Car Audio & Video

1 Answer

My amp


First thing is to make sure that the 15" subwoofer's RMS power rating (not peak power rating) is at least 250watts. Also, you have to be sure that the woofer is in the right enclosure. I am guessing that since you didn't post a model number for the subwoofer or the type of box it is in (i.e. - ported or sealed) that you are putting the woofers in too small of a box or too big of a box. Trucks typically don't have much room for woofer enclosures, so many people favor smaller boxes. The incorrect box will affect how the speaker cone moves due to the internal pressure in the box. Too much movement without and the voice coil hits the magnet causing that "popping" sound. reducing the gains on the 250/1 can often help.

Jul 17, 2008 | Jl Audio 250/1 Car Audio Amplifier

1 Answer

Bose acousticmass 15 sub-woofer making a noise


The sub contains the amp for the other speakers. But it sounds like the amp has a seriously damaged section and will probably have to be serviced by Bose.

Jun 24, 2008 | Bose Acoustimass 15 System

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