DD Audio 4 to 4x6 Adapter Plate ADP-4 — Big Jeff Audio Dealer Platform
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  • Ease of Installation: Simplifies the process of fitting 4-inch speakers into larger 4x6-inch factory spaces
  • Specific Compatibility: Tailored for use with certain DD Audio coaxial speakers
  • Reliable and Secure Fit: Ensures a snug and secure fit for 4-inch speakers in 4x6-inch spaces
  • Durable Construction: Built to withstand the demands of installation and regular use

DD Audio 4" to 4 x 6" Adapter Plate ADP-4

This Listing Includes:

  • (2) DD Audio ADP-4 Adapter Plate

The ADP-4 is a purpose-built adapter plate by DD Audio, specifically designed to adapt 4 inch REDLINE Coaxial Speakers (RL-X4) and 4 inch D Series Coaxial Speakers (D-X4B) to factory speaker slots sized 4 inches by 6 inches. This adapter plate is an essential accessory for audio enthusiasts and professionals who are looking to fit these specific DD Audio speakers into larger factory speaker locations, ensuring a secure and accurate installation.

Product Description:

  • Model: ADP-4

  • Type: Adapter Plate (4" to 4 x 6")

  • Ideal for adapting 4-inch DD Audio speakers to 4 x 6-inch factory speaker locations.

  • Perfect for custom audio installations where speaker size compatibility is an issue.

  • Provides a stable and secure mounting solution for specific DD Audio speaker models.


  • Shipping Weight: 1 Lb

  • Mounting: Designed to facilitate speaker installation in non-standard spots or unconventional areas.

  • Compatibility: Specifically made for REDLINE Coaxial Speakers (RL-X4) and D Series Coaxial Speakers (D-X4B).


  • Length: 6.25" / 158.75 mm

  • Width: 4" / 101.6 mm

  • Thickness: 3.25 mm

  • Diameter: 3.688" / 93.6752 mm

  • Weight: 3.1 oz / 87.8835 g

Additional Information:

  • The ADP-4 adapter plate simplifies the process of mounting select 4-inch speakers into 4 x 6-inch spaces, commonly found in many vehicle models.

  • It's particularly useful in car audio installations for ensuring a seamless fit between aftermarket speakers and factory speaker locations.

Payment Information


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All orders over $500 will require a signature for delivery.

All pre-selected shipping rates and methods are for customers with a
valid residential or commercial address within the Contiguous 48 United
States (PO Boxes address may require additional charges).

P.O. Boxes, APO/FPO addresses, Alaska, Hawaii, Puerto Rico, Guam,
U.S. Virgin Islands, Northern Mariana Islands, American Samoa, Canada,
and other countries may require additional shipping fees. Please contact
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to ship every package with-in 1 business day of receiving a cleared
payment. In some circumstances additional time may be need, in which
case we will contact buyer.

Shipped orders that are returned by the shipping company due to an
insufficient address or an undeliverable address will be refunded less a
20% restocking fee.

If package is refused or marked undeliverable and returned
back to us by the carrier, you will need to pay the shipping cost in
full to have the package sent back to you or we can refund the money
minus the cost of shipping


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please do the following within 36 hours of expected, stated delivery:


Verify the shipping address on the order is the address where you are looking for the package

Look for a notice of attempted delivery

Look around the delivery location for the package, or see if a neighbor has accepted the delivery

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If you think that your package has been stolen, we will require a police report since this is now theft.
Once we have a police report on file for the stolen package, we will reship your order.