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Audibly Elegant


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From the motors up the D Series coaxial and component speakers are truly designed for your listening pleasure. If you’re wanting to level up your aftermarket sound experience, these speakers deliver lounder and more detailed sound from factory locations. Utilizing stronger motors to drive low, lightweight moving parts results in precision output, while low inductance design elements further enhance the phenomenal performance of this collection of speakers. The 25mm silk dome tweeter delivers smooth, balanced highs that perfectly compliment the midrange clarity and punch of the glass composite cone. Additionally, if acoustic excellence wasn’t enough, the elegant appearance of the speakers truly makes them best in their class.


  • Y35 Grade Magnet
  • Kapton Former CCA Voice Coil
  • Copper Shorting Cap
  • 25mm Silk Dome Tweeter
  • Poly Film Tweeter Crossovers
  • Glass Composite Cone
  • Rubber Surround
  • Spider Contoured Tinsel Leads
  • Works W/ ADP-4 to fit 4×6 applications (sold separately)

D-X4b: 50W to 175W – 4 Inch Coaxial Speaker

Speaker Size (In): 4
Tweeter Size (MM): 20
Watts RMS: 50
Watts Peak: 175
Impedance: S3
VCD (MM): 25
Frequency Response (Hz): 90 - 20k
dBSPL: 86
Mounting Diameter (In): 3.7
Mounting Diameter (MM): 93
Mounting Depth (In): 1.7
Mounting Depth (MM): 43
Price (USD): 89 per pair

The D Series Components and Coaxials are feature rich, high fidelity speakers designed for the listener wanting to go well beyond the standard factory upgrade.


The ADP-4 adapter plate is designed to adapt 4 inch REDLINE Coaxial Speakers (RL-X4) and the 4 inch D Series Coaxial Speakers (D-X4B) to factory speaker slots sized 4 inch by 6 inch.

Jabee Toyota Prius Loaded Enclosure Being Installed

Support Small Business and Enjoy Expert Installation

We believe in supporting brick and mortar dealers and have carefully partnered with small businesses who can provide quality installation and customer satisfaction befitting DD AUDIO® equipment.

Check with your local dealer for stock and promotional discounts.