Question about Car Speakers & Subwoofers

1 Answer

JBL W15GTi repair?

Can the JBL W15GTi speakers be repaired? I have two that are making "rubbing" noises, with what sounds like collapsed voice coils. Not sure how or why. The amp driving them is a QSC 950 (475 wpc, and never run at anywhere near full volume). Even full volume the amp is half the capability of the driver, so I'm not sure what's going on.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 4 Answers
Re: JBL W15GTi repair?

You probably blow them out. i doesnt really matter if you never powered them up to the max, try a different speaker and see if they work, doesnt really matter what kind of speaker.

Posted on Dec 08, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

How to bridge a dual voice coil subwoofer, the sub has 4 speaker wire connections coming out the back how do i bridge it two one

You have two choices of how to wire this sub.

First, is an 8 ohm load. This is called a series set up. Go from the positive of the amp to the positive of one voice coil. Then go from the negative of that voice coild to the positive of the other voice coil. Then go from the negative of that voice coil to the negative of the amp.

Second is a 2 ohm load. This is called a parrallel set up. Go from the positive of the amp to the positive of both voice coils. Then go from the negative of the amp to both negatives of both voice coils.

Make sure your amp can handle a 2 ohm load. If you have two subs, you will need a 2 channel amp.

Sep 01, 2011 | JBL GTO1214 Car Subwoofer

1 Answer

How to hook it up for one ohm

oh yes the JBL GTi W15GTI Mkll. this subwoofer is a dual 6 ohm voice coil subwoofer. This is impossible to run this sub alone and get 1 ohm you will need another JBL GTi W15kll. the lowest impedance you can go to is 3 ohms. you can achieve this by connecting the positive terminals together and then running a wire from the two positives to the positive terminal on the amp. then connecting the negative terminals together and then running a wire to the negative terminal on the amp. this is a real nice sub it just has that one down fall of having a six ohm voice coil.

Aug 01, 2011 | JBL GTi W15GTi MkII Car Subwoofer

1 Answer

How do I wire up my jbl w12 to positive an negative

Hi Adrian,
To be honest, it depends on your amp, also on whether this is a dual voice coil sub or a single.

As a rule, if the sub has a dual voice coil (2 sets of connections) then connect the 2 positives together and the 2 negatives and run the 2 sets of cables to one output on the amp.

Check your amp specs to make sure that it will run @ 2 Ohms as this is what will result.

If your amp isn't 2 Ohms stable then you will have to wire each voice coil to a separate output on the amp.

May 08, 2011 | JBL Car Speakers & Subwoofers

1 Answer

I have a subwoofer in my truck. 2 speakers in a box with an amp. One of the subs blew to a song that just came on. the volume was high. Sounds distorted. Any way to fix?

Sounds like the voice coil of that woofer overheated and melted while it was turned up too far. Now that area rubs on the magnet or pole piece internally and makes noise.

No you generally can't fix that except for a few high end woofer brands that have field replaceable voice coils that you can buy. Most subwoofers physically bottom out and sounds really bad before experiencing thermal damage like that. Sounding bad is a warning sign that it's being overloaded.

Note that woofers have 2 different types of overload conditions that can cause damage.
1. Over excursion from deep bass that moves the woofer cone too far and damages the suspension. This is clearly audible. Proper box design and user knowledge will prevent this.

2. Thermal limit. This is the published power rating that the voice coil can absorb without damage. Things can melt or fail entirely if this is exceeded.

Either of those issues can cause the noise you are hearing. Without a more detailed description of what happened or how it sounds before, during and after this is much detail as I can provide. But.. move the woofer some by hand, do it evenly pushing straight down evenly on both sides, not too far, go about half way through it's normal movement. If it clearly rubs and makes noise internally then the voice coil is damaged or if has some debris stuck in there. Most woofer are not serviceable.

There are many other factors that affect the longevity of the woofer, such as
  • Ambient temperature too high
  • Limited air flow has inadequate woofer cooling
  • UV exposure can make the surround material brittle
  • Proper enclosure design is needed to acoustically and physically supports the woofer to prevent bottoming out, particularly at the system resonant frequency.
  • Amplifier distortion can kill speakers even when rated far below the woofers max wattage.

Nov 28, 2010 | Sony XS-AW200 Car Subwoofer

1 Answer

Can I repair a blown(frozen) s-12?

yes- though i have never done it myself.

frozen woofers are often the result of melted vioce coils. here is a site for a company which sells alpine voice coil repair kits:

here is a page which details how to repair voice coils yourself:

Oct 27, 2010 | Alpine SWS-1240 Car Speaker

1 Answer

I have a Kicker Solo-Baric, L7, 12 inch subwoofer making a scratching noise. The cone is fine but the inside is not. Can i get this repaired? Kicker said no. This is a $250-300 sub. I hate to just throw it...

The bad news is that your voice coils could be fried up, basically mechanical failure. Might as well buy a new sub because replacing a voice coil means you got to rip the whole sub apart, very complicating.

Oct 15, 2010 | Kicker Solo-Baric L7 S12L7 Car Subwoofer

1 Answer

It sounds like one of the voice coils is loose how do i get the plastic piece that connects to the spider out thanks

The "plastic piece" doesn't give any of us much to go on... there are many parts connected to the spider. Examples are the cone edge flexure and the centering flexure near the voice coil.

Most f these are held with adhesive.

If a voice coil is loose, it is undoubtedly damaged beyond repair. They rub the pole pieces and wear insulation off and short out blowing the amplifier.

Best to take it for re-coning or read up how to do it. Then you need to get a kit of the materials. There are adhesives, solvents, and new voice coil, centering flexure piece and usually the cover.

Feb 23, 2010 | Jl Audio 12W3v3-4 Car Subwoofer

2 Answers

I have a jbl W15GTi MKII 15 inch and on the speaker it has to a a an b side and two wires no each side how do you hook it up

Your speaker has dual voice coils. You can hook it up so that it is 2 ohm or 4 ohm depending on wat the amp can handle. You can try hooking it up by matching the colors or like any other speaker.

Jun 07, 2008 | JBL Car Speakers & Subwoofers

2 Answers

Voice coils

Hello. I do speaker reconing and amp rebuilds for a living and the L7's often suffer from tinsel leed wire breakage which can cause "poping" and "screaching" noises in the sub in various cone positions. You need to remove the sub and push straight down on the cone repeatly and determine if you can feel or hear crunching noises to make sure the voice coil and/or spider are not damaged. A faulty leed wire can usually be identified by a dark spot or obvious breakage. All of the L5 and L7 models can be successfully repaired as long as they are the older models that have a center cap in the cone. The newer capless models will have to have an upper brace cap glued to all of the cone's fingers and will have a rather ugly appearance. Leed wire overhauls usually run around $30.00 for the older models. Voice coil and spider overhauls run around $90.00.

Dec 12, 2007 | Kicker 02S10L74 Car Subwoofer

Not finding what you are looking for?
Car Speakers & Subwoofers Logo

Related Topics:

143 people viewed this question

Ask a Question

Usually answered in minutes!

Top Car Speakers & Subwoofers Experts

xxxxxx xxx

Level 3 Expert

4679 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21840 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Car Speaker and Subwoofer Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides