Voice Coils

IQS Directory provides a comprehensive list of voice coil manufacturers and suppliers. Use our website to review and source top voice coil manufacturers with roll over ads and detailed product descriptions. Find voice coil companies that can design, engineer, and manufacture voice coils to your companies specifications. Then contact the voice coil companies through our quick and easy request for quote form. Website links, company profile, locations, phone, product videos and product information is provided for each company. Access customer reviews and keep up to date with product news articles.

  • North Fort Myers, FL

    Check out what’s new online at Precision Econowind, manufacturer of the highest quality custom coils at reasonable prices, with on time delivery. Serving the coil industry for over 30 years, we’re experienced with producing loudspeaker & medical industry coils, coils wound on customers’ bobbins/tooling; freestanding, flat wire, edge wound, square, rectangle & shaped coils. Submit your specs today!

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  • Sag Harbor, NY

    We are proud of the craftsmanship of our engineers. All of our products are made right here in the United States and we promise that these items are created from high quality resources. Our electrical coils are unique and efficient. We are dedicated to manufacturing the best coils around. Our teams utilize sophisticated to procedures to develop these top notch electrical coils. Give us a call today to learn more information!

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  • Bristol, CT

    Established in 1973, Classic Coil Company is a Contract Manufacturer of electronic coils. We manufacture coils for a variety of industries; winding wire gauges from 4-58 AWG. We are ISO 9001-2015 certified, ITAR registered and DFARS Compliant. Our Engineering services allow us to assist with design, reduce cost, and increase efficiency in production. Call or visit our website to learn more about our capabilities.

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  • Alpha, NJ

    Since 1962, Torelco LLC has been a supplier of electric coils and transformers of superior quality. We offer custom coils, solenoid coils, ferrite core coils & toroid wound coils to serve a range of industries. Markets served include medical, military, electronics, and industrial. When you work with us, our promise is to build to the exact specifications and meet the custom needs of our customers.

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  • Winsted, CT

    At Dufrane Technologies, we take pride in our extensive range of electric coils. Our comprehensive product portfolio encompasses a wide variety of coil types, including solenoid coils, electromagnet coils, induction coils, and more. Whether you require custom-made coils or standard options, we have the expertise and resources to fulfill your specifications with precision.

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Voice Coils Industry Information

Voice Coils

Consisting of a winding, a collar, and a bobbin, a voice coil is a kind of electric coil. It attaches to the apex of a loudspeaker cone, where its purpose is to help it magnify sound.

Quick links to Voice Coils Information

Voice Coil Design and Customization

When designing voice coils, manufacturers seek to make sure they are as lightweight as possible with the lowest mass possible (too much inertia makes it hard to accurately reproduce high frequency sounds). Often, they encase them in housings to create actuating (movement controlling) parts that help protect them. Nevertheless, because voice coils must be so lightweight and small, they are quite delicate, and users must take care to not pass more power through them than for what they’re designed for. Pairing excessive input power with low frequencies risks causing the coil to knock around and become distorted.

The windings, or electromagnetic coil portion, of voice coils are made from a conductive metal like aluminum. Manufacturers can customize voice coils in a number of ways, including by size, housing type, speed, and force. To vary their properties and the areas in which the coils can work, manufacturers customize wire type. For example, ribbon-wire (flattened wire) creates a coil with a high packing density in magnetic gaps. A coil made from round wire, on the other hand, has a low packing density. To immerse voice coils in a ferrofluid, manufacturers can surface seal the bobbin and collar materials. This helps cool the coil by conducting heat away from it and into the magnet structure.

How Voice Coils Work

To work, the loudspeaker system runs a current through the voice coil, which creates a magnetic field. Inside this magnetic field, the voice coil attracts a permanent magnet permanently attached to a loudspeaker cone. In response to this attraction, the magnet moves, bringing the cone and its audio waveform with it. Once it applies its audio waveform to the coil, the cone reproduces sound pressure waves that correspond to the original input signal.

Notable Types of Voice Coils

Voice coils come in two main varieties: overhung and underhung. The difference between the two is in how they’re immersed into the magnetic field.

Taller than the magnetic gap. These coils feature a higher mass and have correspondingly low to medium sensitivity. If and when the coil exceeds its limits, it displays soft nonlinearity. Nonlinearity is when the output signal strength does not change in direct proportion to the input signal strength. Too much nonlinearity compromises the quality of the loudspeaker.
Shorter than the magnetic gap. With a low coil mass, they display a medium to high level of sensitivity. For that reason, they’re mostly installed in high-end speakers. Unlike overhung voice coils, if and when they exceed their limits, they respond with hard nonlinearity.