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Diamond Audio D308D4 D3 Series 8" subwoofer with dual 4-ohm voice coils

Item # 114D308D4

This 8" D3 sub features a light, responsive copolymer cone and large-roll rubber surround for precise cone...

This 8" D3 sub features a light, responsive copolymer cone and large-roll rubber surround for precise cone...

Item # 114D308D4

About the Diamond Audio D308D4

Jo Greene

Rockin' D3 Series 8" sub

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.

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.

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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
  • MFR # D308D4

What's in the box:

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

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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.

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