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Alpine SWR-8D4

Type-R 8" subwoofer with dual 4-ohm voice coils

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  • Alpine SWR-8D4

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Our take on the Alpine SWR-8D4

by John Pollard
Alpine

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.

Maximum bass output

Alpine Authorized Online Dealer

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.

Side view of SWR-8D4 subwoofer

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.

See more info on this item

Highlights:

  • 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.
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Size 8 -inch
Impedance 4 ohms
Cone Material Pulp-Kevlar
Surround Material Santoprene
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
Free-Air No
Dual Voice Coil Yes
Sensitivity 83.5 dB at 1 watt
Frequency Response 30 - 200 Hz
RMS Power Range (Watts) 150-350
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
Vas (liters) 10.3
Fs (Hz) 42
Qts 0.57
Xmax (millimeters) 12
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • 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)

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.

Features
Enclosure Compatibility

Features

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).

Enclosure Compatibility

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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Alpine SWR-8D4 Reviews

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4 out of 5

Alpine 8" Type R sub

Written By DBooya, Vancouver Island, BC on Sunday, August 31, 2014
Crutchfield Customer Review (What's this?)
 
I'm guessing these haven't broken in yet as they don't give the sound I was expecting for a top quality sub, as far as Alpine sells it. Mind you, I'm running these along with a pair SWS15D4. The 15s make sound like the 8s are along for the ride, even though I've got them crossed to play different ranges. Overall, not bad, but can't say that any extra cash for Type R is money well spent.
Pros:
Easy install, cast basket
Cons:
FInish shows evidence of 'assembly line' finish quality.
Was this review helpful?    Yes | No
"Coolness Factor"
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1 question already asked

Have a 2009 Civic Si with a factory outboard amp that drives the front (component), rear deck full range and sub. Since the sub is in the rear deck it is effectively a "free air" woofer. Has anyone ever tried this sub in this application or another 8" brand and how did you like the performance? It would be nice to maintain the trunk space and keep the sub in the rear deck but I don't want to sacrifice too much performance either. [ Mark B  Jun 17, 2014 ]
1 answer
  • Free air deck, if you can afford it, go with a dual setup. I currently have a dual 8 inch (2 ohms mind you) SWR-8D2 setup in my Caliber SRT4. The performance and acoustics these two little subs deliver is absolutely phenomenal. They sound crisp, clean and have LOTS of BASS to shred your ear drums out with. I would highly recommend these subs and would highly recommend a dual 8 inch setup for truly amazing bass. I plan to add a third 8inch SWR-8D2 into a cubby nook in the back to allow for full storage utilization without sacrificing bass. Hope this helps :) P.S. If you go with the dual setup, make sure to have an amp that can push at least 700 watts out to the subs. [ AARON   Jun 18, 2014 ]

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For a more in-depth review and enhanced detailed information on the Alpine SWR-8D4, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_500SWR8D4/Alpine-SWR-8D4.html ).