Repairing Guides

how to repair a voice coil

by Marilie Harber Published 2 years ago Updated 1 year ago
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  • Step 1: It is first necessary to position the mold in the winding machine and tightly tighten it.
  • Step 2: Measure the width of the damaged voice coil.
  • Step 3: You should measure the aluminum strip face over with a tolerance of 2 millimeters.
  • Step 4: Using a pencil or screwdriver, bend the aluminum strip. ...

Full Answer

How do you wind a voice coil?

Winding the voice coil entails placing the blank onto an arbor, forming it into a cylindrical bobbin, and winding wire onto the form. As the coil is wound onto the bobbin, the insulation coating (and the thermoset adhesive coating on the blank) is activated with MEK, alcohol/acetone or another solvent system.

How do you clean a voice coil?

Be somewhat liberal with the acetone and if you can find plastic to shim the voice coil with, even better. The paper index cards can be a bit too tight and tear when you pull it out. If you do use paper, leave it for a couple days to make sure there is no moisture so it will be less likely to rip.

What are the components of a speaker voice coil?

The typical speaker voice coil has less than a half-dozen components: the bobbin, the wire, the collar, adhesives, and the lead-out wire. The voice coil starts out with a die-cut, pre-coated with adhesive blank, onto which is the voice coil wire is wound.

What is the form factor of a voice coil?

The voice coil starts out with a die-cut, pre-coated with adhesive blank, onto which is the voice coil wire is wound. The form factor of the bobbin blank will depend on many factors. Of course, the bobbin’s diameter is dependent on the voice coil gap diameter.

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Can voice coils be repaired?

It is sometimes possible to gain sufficient access to re-glue the voice coil. Use a slow drying or curing glue and ensure that this is placed between the coil and the cone. Apply evenly all round so that as it dries or cures it pulls evenly on the cone and keeps the coil in place in the centre.

How do you fix a coil voice on a speaker?

3:004:41How to fix a 'blown' loudspeaker with coil rub - YouTubeYouTubeStart of suggested clipEnd of suggested clipInside that hold the magnet on and now you can see that this thing moves around a little bit andMoreInside that hold the magnet on and now you can see that this thing moves around a little bit and when there's so little clearance between the voice coil.

How do I know if my voice coil is damaged?

Distortion at Normal Volumes - If even at moderate volumes you hear hiss, static, and fuzz, then you have one of two problems on your hands. You either have loose or damaged voice coils or you have a torn cone. If you turn up the volume the problem should get worse.

Can you fix blown voice coil subwoofer?

Can you fix a blown subwoofer? Yes, you can fix a blown subwoofer especially when it is partially blown sub damaged cone. However, a damaged voice coil will be difficult to replace. Depending on the extent of the problem, the best solution is to purchase a new subwoofer.

How do voice coils burn out?

A poor contact between the connection wire + and - terminals can be at the origin of important noise, which results in a burst of amplifier distortion at high levels of electrical power.

How do you clean a voice coil?

Remove the dustcap or center dome, and insert a piece of tape in between the inside of the voice coil former and the magnet pole piece. You must inch it down the former a small amount at a time and then rotate 360 degrees to try to get the loose dirt to attach to the tape. Gently remove and try again.

How do you test a voice coil?

0:122:19How To Test A Speaker or Tweeter Voice Coil - YouTubeYouTubeStart of suggested clipEnd of suggested clipAll you have to do is touch the leads. To the terminals. And it will set the decimal where it needsMoreAll you have to do is touch the leads. To the terminals. And it will set the decimal where it needs to be the decimal point this one you do need to set it in a different range.

What does burnt voice coil smell like?

Burning voice coil smells like burning rubber or tire, and it is very pungent. If you smell this, your voice coil is probably burning and you will need to check it out.

What does a blown sub sound like?

Partial sound with distortion – When you hear a weak, distorted sound coming from your subwoofer, at any volume, you probably have a partially blown subwoofer on your hands.

Is it worth repairing a subwoofer?

A: The short answer to your question is no, the repair is likely not worth it. The price/performance ratio of subwoofers has improved considerably in the last decade, so finding a subwoofer that matches or beats the AS 20's specifications—8" driver, 60 watts RMS, 33 Hz to 140 Hz frequency response—is not too tough.Dec 19, 2015Ask the Editors: Is This Old Sub Worth Repairing? - AVS Forumhttps://www.avsforum.com › threads › ask-the-editors-is-t...https://www.avsforum.com › threads › ask-the-editors-is-t...Search for: Is it worth repairing a subwoofer?

How do I know if my sub is blown?

0:142:46Car Audio : How to Tell if a Car Subwoofer Is Blown - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo that you make sure that you're not off access when you're pushing it up and down. And you want toMoreSo that you make sure that you're not off access when you're pushing it up and down. And you want to notice if you hear any scratching noises or. If it won't move.Car Audio : How to Tell if a Car Subwoofer Is Blown - YouTubehttps://www.youtube.com › watchhttps://www.youtube.com › watchSearch for: How do I know if my sub is blown?

What kind of glue do you use to repair a speaker?

Permabond 737 is a toughened cyanoacrylate adhesive that is ideal for use in applications regarding the speaker cone, such as surround to cone, cone to spider, and dust cap to cone parts of the speaker.Mar 16, 2020How To Use Adhesives To Repair Speakers - Antala Ltd.https://www.antala.uk › repair-speakershttps://www.antala.uk › repair-speakersSearch for: What kind of glue do you use to repair a speaker?

What is a voice coil in a speaker?

The speaker coil or loudspeaker voice coil is a coil of wire attached to the apex of a loudspeaker cone. Current passing through the speaker coil provides the motive force to the cone by the reaction of a magnetic field to the current passing through it.

How do you fix a speaker cone?

Use a flexible glue and then the rigidity of the cone will not be affected too much. Also use the minimum glue consistent with creating a firm bond, otherwise the mass of the cone will be altered and its performance changed. Leave the loudspeaker until all is dry and the test it out.

How do voice coils work?

Voice coils are based on a copper coil energized by an electric current and placed inside a magnetic field usually provided by permanent magnets. The force generated by the coil is proportional to the magnetic field and the direction and magnitude of the electric current.

What is a voice coil in a subwoofer?

The voice coil in a subwoofer is a coil of wire wrapped around a cylinder called the former, which accepts the amplifiers current. Current from the amplifier causes the coil to react with the stationary magnet, moving the former up or down.

What does it mean when your Klipsch woofer is rubbing?

Voice coil rubbing HOW TO REPAIR. If the voice coil is rubbing in your Klipsch woofer, don't throw it out yet. Some folks think it means the voice co il is blown or burnt up. It might just be out of alignment. The easy way to tell is look at the spider and see if it has become unglued from the frame.

Can you tell if a woofer has been worked on?

You generally can't tell that the woofer has been worked on.

How many screws do you need to loosen a speaker?

When you loosen the mounting, and/or go to 4 mounting screws instead of 8, hand tight, the speaker works perfectly.

Why does my JBL speaker frame warp?

Some JBL's, the 15 inch speakers in particular, the frame will warp if you torque them down too tight, and the voice coil will hang up in the gap.

How to wind a voice coil?

Winding the voice coil entails placing the blank onto an arbor, forming it into a cylindrical bobbin, and winding wire onto the form. As the coil is wound onto the bobbin, the insulation coating (and the thermoset adhesive coating on the blank) is activated with MEK, alcohol/acetone or another solvent system.

What is a voice coil?

Voice Coil Basics. The typical speaker voice coil has less than a half-dozen components: the bobbin, the wire, the collar, adhesives, and the lead-out wire. The voice coil starts out with a die-cut, pre-coated with adhesive blank, onto which is the voice coil wire is wound. The form factor of the bobbin blank will depend on many factors.

How does a bobbin vent work?

Bobbin Venting — Some speaker engineers use holes punched into the bobbin between the top of the voice coil stack and the neck joint. Primarily, this technique is used to improve cooling . Air cavity pressure buildup may be reduced behind the dust cap with this form of bobbin venting. Other positive effects are mass reduction and dampening torsional bobbin resonances. One not so attractive effect is the nasty turbulence “whistling” that can result if the air velocity is too great through the vents or if the vents become partially blocked on large excursions. If the vents are too large, then the structural integrity of the bobbin could be compromised and buckling may result.

How long to bake voice coils?

To provide a rough guide, if the adhesive nominally requires 25 minutes at 425˚F, then a small coil (small gauge/small diameter) might be baked for 30 minutes at 425˚F. A large 3” to 4” diameter coil can require 80 minutes at 450˚F. Finished voice coils wound on bobbins are available and numerous suppliers are listed in the Voice Coil Winder directory published every year. Alternatively, speaker manufacturers bringing the process in-house might start with the coated blanks and wind either directly onto the bobbin or bond the bobbin to a ready-made coil stack, which is sliced (this is more common in flat wire voice coils).

Why are eddy currents not uniform?

Additionally, the eddy currents are not uniform along the width of the bobbin due to divergence of the induced current at each end of the sheet. This results in a tipping or canting force induced on the voice coil that is proportional to the cone velocity.

Can you use wet winding wire on voice coils?

Alternatively, wet winding wire techniques are used, usually for very high power voice coils. In this case, the adhesive is applied to the insulated, non-adhesive coated magnet wire as part of the winding operation. The entire voice coil assembly is then cured.

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