Rockin' D3 Series 8" sub

You hit the highway and crank the stereo, but your factory bass just can't keep up. Diamond Audio designed D3 Series subwoofers for high-performance bass in your car — you'll hear lots of heavy, powerful low notes that make for a very entertaining ride, even if it's just across town.

Exploded view

Heat dissipating woofer

This 8" D3 sub features a light, responsive copolymer cone and large-roll rubber surround for precise cone movement, so you can count on strong, accurate performance. The stamped aluminum dust cap directs heat away from the motor structure, and helps prevent heat from getting trapped in your subwoofer enclosure.


Aluminum voice coils stay cool

Interior cooling

Diamond Audio furnishes this sub with hefty 2-1/2" aluminum-coated copper voice coils that dissipate heat for extended power handling. Proprietary Venturi venting in the basket and pole piece funnels warm air away from the sub's interior, and that means the sub stays cooler and happier. The dual 4-ohm voice coils give you more options for wiring the sub into your system, and make it easy to add a second D3 sub later on.


Non-resonant basket resists distortion

The heavy-gauge stamped steel basket gives this sub the strength and stability it needs to rock hard for the lifetime of your system. Diamond Audio forms this basket using a unique stamping technique that virtually eliminates unwanted resonance, so your favorite music sounds just as the artist intended.


Diamond Audio goes the extra step

Dual spider assembly

In most subs, the spider assembly is glued to the basket. In D3 subs, Diamond Audio uses a dual spider assembly that is glued and screwed to the basket to virtually eliminate the possibility of mechanical failure.

Product Highlights:

  • 8" subwoofer with dual 4-ohm voice coils
  • textured copolymer cone with nitrile butadine rubber surround
  • heavy-gauge stamped steel basket
  • power range: 20-200 watts RMS (400 watts peak power)
  • frequency response: 30-500 Hz
  • sensitivity: 83 dB
  • top-mount depth: 4-1/8"
  • sealed box volume: 0.5 cubic feet
  • ported box volume: 1.0 cubic feet
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

Hands-on research

What's in the box?

Download owner's manual

  • 8" Dual 4-ohm voice coil subwoofer
  • Rubber trim-ring (installed)
  • Installation manual

Product Research

Features
Enclosure Compatibility

Features

Dual 4Ω Voice Coils: The D308D4 features dual 4Ω voice coils. When the voice coils are wired in parallel, the woofer presents a 2Ω load; when wired in series, the woofer presents an 8Ω load.

Cone: The textured copolymer cone has an aluminum dust cap to help draw heat away from the voice coil.

NBR Surround: The woofer features a Nitrile Butadiene Rubber (NBR) surround, a synthetic rubber that stands up to the harsh automotive environment.

Spring-Post Terminals: The spring-post terminals will accept pin connectors, single banana plugs, and bare wire up to 8-gauge.

Concealing Ring: The included rubber trim-ring provides a mounting gasket and covers the mounting screws, giving the subwoofer a finished look.

Enclosure Compatibility

Sealed Enclosure: The recommended sealed box volume is 0.5 cubic feet.

Vented Enclosure: The recommended vented box volume is 1.0 cubic feet with a 3" diameter, 7-1/2" long port; resulting in a tuning frequency of 45 Hz. A 30 Hz sub-sonic filter is recommended for vented enclosures.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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Get everything you’ll need to enjoy your new Diamond Audio D308D4

It's critical to have good wire, and none is included with the sub.
Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
Add a grille and keep your sub safe.
These can be useful if you are building a custom box.
T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

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T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

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Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

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Dynamat Xtreme Trunk Kit

5 sheets, 20 square feet

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Dynamat SuperLite Tri-Pak

Dynamat SuperLite Tri-Pak

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Dynamat 19100

Dynamat 19100

License Frame Kit

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Dynamat Dynaliner

Dynamat Dynaliner

One 54" x 32" sheet (1/8" thick)

Item #: 15411101

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Dynamat Xtreme Wedge Pack

Dynamat Xtreme Wedge Pack

1 sheet, 4 square feet

Item #: 15410425

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Speaker Grilles

Speaker Grilles

(8" waffle style)

Item #: 125G08

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Polyester Fiber Stuffing

Polyester Fiber Stuffing

Make your subwoofer think it's in a bigger box (1-pound pack)

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$12.99
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Metra Speaker Terminal

Metra Speaker Terminal

Round terminal cup with binding post connectors (for do-it-yourself box builders)

Item #: 120TCRB

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Rubber Feet

Rubber Feet

Item #: 125F1692

(4)

Metra Speaker Terminal

Metra Speaker Terminal

Square terminal cup with binding post connectors (for do-it-yourself box builders)

Item #: 120TCSB

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Corner Protectors

Corner Protectors

Item #: 1251536

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Metra Speaker Terminal

Metra Speaker Terminal

Round terminal cup with spring clip connectors (for do-it-yourself box builders)

Item #: 120TCRS

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Springback Handle

Springback Handle

Item #: 125H1051K

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Grille Clamps

Grille Clamps

(Front/top mount clamps)

Item #: 125G727KIT

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Metra Speaker Terminal

Metra Speaker Terminal

Square terminal cup with spring clip connectors (for do-it-yourself box builders)

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Metra Box Carpet

Metra Box Carpet

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