Pioneer combines its new Champion Series Subwoofer, the TS-W308D4, into ported box to deliver deeper and more powerful bass in a smarter and easier installation option.

 For extraordinary performance, the subwoofer cone is made of Pioneer's IMPP with Aramid Fibre, and we've used a dual mass magnet assembly for higher magnetic force — and more power. The wire terminals are spring-loaded and can take up to 8-gauge wire.

To ensure that you get more natural bass, we’ve incorporated out new Basalt fibre technology into our shallow subwoofers. The volcanic-rock fibres create a cone that is lightweight, rigid, well damped, stable in temperature extremes, and more environmentally friendly. In short, this bass really rocks.

3-Layer Radial Surround

A sub's surround plays a key role in its overall performance. In order for bass response to be clear and tight, the surround has to respond evenly around its entire circumference without flexing or puckering, even at high volume levels. That's why Pioneer created a surround consisting of two layers of urethane, with a layer of interwoven fibre between them. It's strong, stable, and it reduces distortion.

Dual Mass Magnet with Magnet Cover
It's simple, really. Follow us here: to accurately drive and control its voice coil, a speaker needs a magnet and a pole yoke, to create magnetic force. The bigger or denser the magnet, the greater the magnetic force. The greater the magnetic force, the greater the power and control that's exerted over the voice coil. To make this happen in a big way, we use a Dual Mass Magnet assembly (weighing in at 83oz.) to significantly increase the magnetic force. SO, you get bigger and more accurate music. And yes, we even included a magnet cover.

Spring-Compression Binding Posts
Why do we use Spring-Compression Binding Posts, instead of standard speaker wire terminals? So your speaker wire won't shake loose due to vibration (either from the road or from your music). When you insert the wire, the connector keeps a constant pressure on it. And it won't let go. These binding posts will accept wire as large as 8-gauge.

Dual Voice Coil
308D4SB provides two voice coils, each at dual 4 ohms. So you can use a low-impedance amp to produce much bigger, much more powerful bass. More options, more power: that's what DVC is all about. The Bridging Adapter is included for an easy Single Voice Coil hook-up. It becomes a Single 4 Ohm with Bridging Adapter for ultimate flexibility for use with modern mono amplifiers.
 

Subwoofer Specifications:
• Size: 12”
• Woofer Cone Material: Interlaced Basalt/Carbon Fibre Reinforced IMPP Cone
• Woofer Cone Design: Cone Reinforcement Arcs
• Surround: Wide Roll, Three-Layer Fibre Woven Radial
• Voice Coil: 4-Layer, Long Voice Coil
• Voice Coil Wire: Copper
• Voice Coil Bobbin: Phenol Resin Coated Glass Cloth
• Damper (Spider): Aramid Fibre
• Damper Ring: Yes
• Top Plate: Standard
• Magnet Construction: Double Mass High-Power (83oz)
• Basket Design: Stamped Basket with Magnet Cover
• Gasket: ABS
• Wire Terminals: Integrated Single-Sided Silver Compression Terminals
• Watts MAX. Music Power: 1400 Watts
• Watts Nominal Power Handling: 400 Watts
• Ohm Rating: 2 or 8 ohm 
• Frequency Response: 20 ~ 180Hz
• Sensitivity: 90dB
• Dimensions: 327 mm x 172 mm
• Mounting Depth: 153mm

Enclosure Specifications:
• Total Internal Volume: 46.801 Litres
• Port Type: Hi Efficiency Slot Port with Flaired Exit
• Port Tuning Frequency: 42Hz HZ
• Port Diameter Equivalence: 2 x 5.5 inch
• MDF Thickness: 18mm on all sides