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Alpine Type-R SWR-8D4

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Alpine Audio Store

General Features:

  • 8" Dual 4-Ohm Type-R Series Car Subwoofer
  • Power Handling:
    • Peak: 1000 watts
    • RMS: 150-350 watts
  • Impedance: Dual 4 ohms
  • Reinforced Parabolic Cone Structure with Poly-Mica Dust Cap & Pulp-Kevlar Cone
  • Durable HAMR Santoprene surround
  • Nomex Progressive Conex spider
  • Compound Radius Curve pole geometry
  • Oversized 1.6", High-Temperature, 4-Layer Dual Voice Coil
  • 52 oz. Double Strontium magnet motor structure
  • Frequency response: 30-200 Hz
  • Resonance Frequency (Fs): 40Hz
  • Excursion: 12mm
  • Top-mount depth: 4-1/2"
  • Sensitivity: 83.5dB
  • 1-year Sonic Electronix Warranty

Alpine products are warranted solely by Sonic Electronix, Inc. under the same period and terms as the original Alpine warranty. Sonic Electronix is not an Authorized Alpine Dealer and Alpine requires all merchandise purchased by Sonic Electronix customers to be returned solely to Sonic Electronix. Alpine products are also covered by our Standard Return Policy for returns on exchanges or refunds within 30 days from the date of purchase.


Second Depth
The second depth is used only when the box is slanted or angled. This value is the top measurement and it is measured in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
The height of the item, measured from top to bottom, in inches.
The width of the item from left to right (side-to-side) measured in inches.
Color of handle.

Warranty and Return Policy

Parts Warranty Duration
90 days
Labor Warranty Duration
90 days
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

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Average Attribution Rating

Browse 2 questions and 12 answers
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Why did you choose this?
Sonic Electronix Store
Top rated item at a good price.
Kenneth W on Nov 21, 2015
Fan of this line since college...just knowing that my sound matched with HU and Amp from Alpine is excellant
Roderick s on Jan 5, 2015
Ive always wanted to do a system with 8"s and it was a good deal for alpine type Rs, great subs.
joseph m on Oct 31, 2015
To install in F250.
Clint B on Sep 17, 2014
Is there a protective grill for it?
Ted U on Dec 8, 2015
Best Answer: Aleksandar is correct. There is a protective grill (sold separately) for this subwoofer. It has a unique method of installation with all hardware supplied with the speaker grille kit. Expensive for what is is, but looks much better than most universal grilles which could be adapted to fit.
Alpine KTE-8G
Alpine KTE-8G
Reply · Report · Darryl E on Dec 9, 2015
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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Alpine Type-R SWR-8D4