About the Alpine SWR-8D4
Maximum bass output
Maximum bass output
Alpine's Type-R subwoofers will bring big bass to just about any vehicle. The SWR-8D4 8" sub features a cone made from Kevlar® treated pulp — the same material used to make bulletproof vests — and its durable HAMR Santoprene™ surround allows for huge amounts of excursion. This sub was built for bassheads that want the best of both worlds: accurate response and otherworldly thump.
Bring on the power
The SWR-8D4 can handle up to 350 watts RMS, so be sure to choose a suitable amplifier as these subs definitely want lots of juice. Its dual oversized 4-ohm voice coils offer the wiring flexibility you'll appreciate as your system changes and grows, ensuring that you can always pull maximum power from your amp. It works well in sealed and ported enclosures so you can choose what kind of bass you want to hear and feel.
Note: If you are wiring this DVC sub for lower impedance, make sure that your amp is compatible.
To drive this single subwoofer, we recommend a mono amplifier rated between 260 and 525 watts RMS at 2 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.
- 8" subwoofer with dual 4-ohm voice coils
- Kevlar reinforced pulp cone with HAMR Santoprene rubber surround
- frequency response: 30-200 Hz
- power handling: 150-350 watts RMS (175 watts per coil)
- peak power: 1,000 watts
- sensitivity: 83.5 dB
- top-mount depth: 4-1/2"
- sealed box volume: 0.15-0.50 cu. ft.
- ported box volume: 0.25-0.70 cu. ft.
- grille not included
- warranty: 1 year
- Our 60-day money-back guarantee
- MFR # SWR-8D4
What's in the box:
- One 8" Dual 4-ohm voice coil subwoofer
- 1 Rubber concealing ring (installed)
- Two 4.5" jumper cables (each cable has a single banana connector on each end)
- Type-R Subwoofer application guide (English/ French)
- On-line product registration information (English/ French/ Spanish)
- Warranty information (English/ French)
- Important Notice (English /French)
More details on the Alpine SWR-8D4
Features & specs
|Impedance||2 ohms or 8 ohms|
|Ideal Sealed Box Volume (cubic feet)||0.3|
|Ideal Ported Box Volume (cubic feet)||0.7|
|Port diameter (inches)||N/A|
|Port length (inches)||N/A|
|Dual Voice Coil||Yes|
83.5 dB at 1 watt |
|Frequency Response||30 - 200 Hz|
|Max RMS Power Handling||350|
|Peak Power Handling (Watts)||1000|
|Top Mount Depth (inches)||4 9/16|
|Bottom Mount Depth (inches)||5 3/16|
|Cutout Diameter or Length (inches)||6 15/16|
|Parts Warranty||1 Year|
|Labor Warranty||1 Year|
Kevlar Reinforced Pulp Cone: This Alpine Type-R subwoofer has a two-piece structural parabolic Kevlar reinforced pulp cone. Kevlar adds strength and tear resistance to the woofer cone while maintaining the benefits of a pulp cone design. There is also an oversized inverted poly-mica dust cap, which increases rigidity and virtually eliminates cone distortion at extreme volume levels.
HAMRS: The woofer features a High Amplitude Multi Roll Surround (HAMRS), made of Santoprene, that allows a large linear excursion and greater SPL. The HAMRS design allows extreme excursions without sacrificing valuable cone area.
Progressive Spider: The progressive Conex spider has reinforced layer tinsel leads to ensure reliable and consistent control of the tinsel leads and eliminate any mechanical noise or interference often seen in high excursion cone designs.
Compound Radius Curve Pole Geometry: Alpine's Patented Compound Radius Curve pole geometry ensures a symmetrical magnetic field, while optimizing flux density to reduce distortion and further improve power handling and output.
Oversized Voice Coil: The oversized (40mm), high-temperature, 4-layer dual voice coils offer increased power handling to 350W RMS / 1000W Peak.
Dual Voice Coils: For system flexibility, the woofer has two 4-ohm voice coils. When the voice coils are wired in parallel, the woofer presents a 2-ohm load. When the voice coils are wired in series, the woofer presents an 8-ohm load.
Spring Terminals: The spring post terminals are all located on one side of the woofer. The terminals will accept bare wire up to 8 gauge, pin connectors, or single banana plugs.
Jumpers: Included with the woofer are two voice coil terminal jumpers. These jumpers allow you to easily wire the voice coils in parallel (for a 2-ohm load) or series (for an 8-ohm load).
Sealed Box Volume: The recommended sealed box volume ranges from 0.2 cubic feet to 0.55 cubic feet, with 0.3 cubic feet being the ideal size.
Ported Box Volume: The recommended ported box volume ranges from 0.3 cubic feet to 0.75 cubic feet. The ideal size is 0.7 cubic feet, using a slot port measuring 7" (W) x 3/4" (H) x 15-1/2" (L).
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