Custom Voice Coils

Custom voice coils have been the core of our business at Precision Econowindsince we began producing electric coils over 40 years ago. Round, rectangular, D-shaped, flat wire or custom shaped coils can be produced using precision layering practices. Single layer, multilayer, wet wound, dry wound, bifilar, multi-filar, dual, and quad coil configurations are available. Custom manufacturing solutions can be designed for a range of sizes and coil configurations. Copper, aluminum or CCA wire from #16 AWG to #48 AWG can be used to create voice coils with inner diameters ranging from 0.232”-10.0”. Custom inner diameters can be fabricated with custom tooling if required. Tolerances as tight as ±0.001” can be held on inner diameter dimensions.

Coils are wound using our proprietary high-temperature adhesive capable of withstanding operating temperatures upwards of 500°F. This attribute has led customers to turn to us when competitors’ coils have come apart due to adhesive failure. Precision layering techniques and flat winding capabilities allow us to produce coils with the highest possible turn density, providing superior performance and sound characteristics. Winding with flat wire, since we do the flattening in-house, allows us to custom fit a customers’ electrical specifications (DCR, turns) into their physical specifications (ID, OD, winding width) for a much more efficient use of space. Electrical testing including resistance, inductance, and turns count testing can be performed to customer specifications. Standard lead time on voice coils is 3 weeks with additional time for new tooling if applicable. We accept blanket orders and can stock items for customers as part of our commitment to provide the highest quality service available. For more information about our custom voice coil winding capability, see the table below or contact us directly.


General Capabilities
Accommodate Customers’ Custom Designs Contract Production Small Parts Precision Layered
Coil Shape
Round Rectangular D-Shaped Other Custom Shapes
Coil Winding Process
Free Standing Wound on thin film material (Polyimide, Aluminum, Fiberglass) Single Layer Multi-Layer Wet Wound Flat Wire (Edge Wound or Flat Wound) Bifilar Windings Multifilar Windings Dual Coils Quad Coils
Wire Material
Copper Aluminum Copper Clad Aluminum (CCA)
Wire Shape
Round Rectangular Flat
Insulation Material
Low Temp (155°C) High Temp (220°C)
Max Adhesive Temperature Rating
> 220°C
Wire Size (AWG)
#16 to #48 AWG
Voice Coil Winding Inner Diameter (ID) Range
0.232” – 10.0” Other sizes available with custom tooling
Winding Inner Diameter (ID )Tolerance (+/-)
±0.001” to ±0.003”
Added Value Processes for Coil Finishing
Stripping and Tinning leads Tinsel Attachment
Coil Winding Equipment
Manual Coil Winding Machines CNC Coil Winding Machines Soldering Irons/Posts Soldering Equipment Automated Stripping Automated Tinning
Testing Equipment
Ohm Meters Inductance Meters Turns Counting Equipment
Testing Capabilities
Resistance Turns Count Inductance
Secondary Services
Assembly Blanket Orders Carrying Stock for Customers
Production Volume
Prototype Small Run Large Run
Typical Lead Time
3 Weeks Typical Additional Time Required for Tooling


Industry Focus
Loudspeaker Consumer Products Industrial Components
Intended Applications
Loudspeakers Voice Coil Motors Space Constraint Applications
Industry Standards
ISO 14001 ISO 13485:2003
File Formats
PDF Custom Sketches Verbal Descriptions