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  Orders: (800) 536-3691    
  Technical: (616) 534-9121

  Speaker components:
   Mid Woofers
   Full Range
   Passive Radiators

  Crossover parts:

   Crossover Design
   Damping Materials
   Gift Certificates
   Grille Cloth
   Grille Fasteners
   Port Tubes
   Terminals -Cups
   Test Software
   Wire Ends

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How To Order
On line
Start shopping at the home page. You can check out without registering if you like. Your credit card will not be charged through the web site. There are real people here that will review your order, compute the exact shipping charges and bill the card just before our UPS drivers picks up your package.


If you might have questions about a product or service, a phone call is probably the best choice when placing an order. We are not just a parts supplier, but speaker builders ourselves and can help you make an informed decision.

Orders: 800-536-3691
Questions: 616-536-9121


24 hour fax line 616-534-7676


We need to have your credit card info on file first. Email is not secure for credit card info! Please call or fax credit card information.


Mail orders are always welcome. Bank checks or money orders are best as personal checks can take up to a week to clear.

Rush orders:

If you need your items quickly, please let us know. Because we wind inductors just for you and test every driver we sell, some orders ship the day after you place your order. We’ll do the best to hurry along the process, if you have a long weekend coming up and are anxious to build. Just let us know.

Will Call:

You are more than welcome to stop by and purchase the items you need. Please give us 24 hours advance notice. Most of our inductors are made to order, plus, we can let you know if any other items are out of stock – saving you a trip.

Payment methods:

American Express
Paypal – You will get a Paypal invoice from us once we confirm stock and calculate the best / exact shipping charges.
Bank Check or Money order
Wire transfer - large, International orders

Shipping charges:

A best estimate of shipping charges will be given at check out, but we will review your order, determine the exact weight and choose the best shipping method and price for you. All international orders will be quoted for shipping charges before shipping. We have good rates with DHL. If you prefer one shipping method to others, please let us know.