Alpine SBR-S8-4

Ported enclosure with one 8" Type-R subwoofer

Item #: 500SBRS84

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Add some bass, save some space

Alpine's SBR-S8-4 ported sub enclosure gives you the bass your system has been missing without taking up the valuable storage space you need. This enclosure is tuned by Alpine's experts to give you impressive bass with minimal power requirements.

Alpine SBR-S8-4

The sturdy, ported enclosure lets you get impressive bass out of the 8" Type-R sub.

Powerful 8" Type-R sub

Alpine loaded the SBR-S8-4 with an 8" Type-R subwoofer, a speaker known for its serious bass performance. They created the ported, high-quality MDF enclosure as a perfect match for the sub, guaranteeing maximum punch while maintaining a very small profile.

Slim box makes placement easy

The SBR-S8-4 comes in at only 6-5/8" deep so you can install it in a convertible's trunk, behind the seat in your standard cab pickup, and in many other problem vehicles. Carpet protects the enclosure from nicks and scratches, while a metal grille protects your sub from flying objects and other hazards in your car.

Product Highlights:

  • ported enclosure with one 8" Type-R woofer
  • 3/8" medium-density fiberboard construction (3/4" MDF front baffle)
  • 4-ohm total impedance
  • recommended power: 150-350 watts RMS (1,000 watts peak power)
  • frequency response: 30-200 Hz
  • 19-1/4"W x 11-3/8"H x 6-5/8""D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Enclosed Subwoofers 101

An enclosed subwoofer is a box with a subwoofer already installed. The advantage to buying an enclosed sub is that the manufacturer made the sub, then designed and built the box as a perfect match, so you'll get the best possible performance. Every enclosed sub has a maximum RMS power handling rating, so pair it with an amp with a similar RMS power rating to get the best performance.

Alpine SBR-S8-4 Reviews

Average Customer Review:

7 reviews
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Awesome sub

Written By Eddie K, New Hampshire on Sunday, May 17, 2015

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I purchased this sub to replace the factory sub in my 07 CRV, which was a joke. I picked it up at a local car audio place and pulled out the 4 ohm sub that came in the enclosure and swapped it for a dual 4 ohm voice coil Alpine Type R sub so I would be running 2 ohms. My Alpine amp runs 300x1 in 4 ohms or 500x1 in 2 ohms. What a perfect match, the Alpine DV4 sub running at 500 watts. Sounds incredible. The vehicle shakes like I'm running 10's. Highly recommend.

Pros: Great bass response, clean bass.

Cons: none

Quality Speakers with Quality Sound

Written By Anonymous, HI on Saturday, March 07, 2015

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

Just Perfect! I got Two, and they ROCK!!

Pros: Slim design to fit under back seat. Deep quality sound. They sound like 10"s.

Cons: As always..... The Price! But for a TypeR speaker in its own enclosed box, this is a steal

Sounds great!

Written By j_park3r, Wayne, MI on Sunday, February 09, 2014

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

Was having a hard time finding a sub for my 05 Dakota Quad Cab...although I'd prefer something completely out of the way this fits perfectly in the rear floorboard and takes up minimal space. I have 2 younger kids and they just rest their feet on either side of the speaker so it's like it's almost not even there.

I was looking for something to fill in the lows of my current setup and this sub does the job even better than I had expected.

I ended up running it off the rear channel of my Alpine MRP-F300 and moving my rear speakers to the head unit for the time being so I'm sure it would probably sound even better with more power to it.

Pros: Sounds great, takes up very little room

Cons: None yet.


Written By Clos, Albq, NM on Friday, November 08, 2013

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

Great sound for a smaller sub. works great under the passenger seat of my truck, takes up no cab space.

Pros: Sounds lots bigger than it is and is fairly small and compact. Great clean bass

Cons: None for me

Nice surprise

Written By Don, San Diego, CA on Friday, July 19, 2013

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I bought this sub to replace my beloved JL Microsub that I've used since 2000. I bought locally for about $250. I have this powered by an Alpine 5 channel amp producing a stated 150w to the sub. All in my 06 Mini Cooper. The rest of the system consists of MB Quartz components up front and Polks in the rear. I am running the stock HU through a line out converter.

This subs kicks butt! I have to say I didn't expect much, so I was pleasantly surprised. For rock and metal it accurately produces tight, clean bass drum with no muddling. Pop and rap sound good and the bass hits hard enough to vibrate the mirrors and your chest. More than deep enough for anything you can throw at it. Size wise, it's small enough that it doesn't take up much space in the boot. Construction is solid and feels of good quality as you would expect from Alpine, and it is substantial enough that it won't slide around even if its not secured.

I've seen reviews around the net bashing this sub as too small or it's just an 8, but I think those people haven't heard this sub properly set up or were expecting it to be like 2 12's. It's not. So if that's what you want, look elsewhere. But if you want good quality bass from a quality built unit for not a lot of money, this should definitely be on your list.

Pros: Tight, clean bass Quality construction Small in size

Cons: None

Excellent addition to my Sienna

Written By rheteric, Philadelphia, PA on Friday, July 05, 2013

Crutchfield Customer Review (What's this?)

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I can't find a single flaw with this subwoofer. The bass is excellent. I have it paired with a Rockford Punch T-400-4 so with 2 channels bridged it is getting about 265 watts. I do not play it overly loud but for a vehicle the size of mine, a 2012 Toyota Sienna, it is impressive how solidly it fills in the low end. I have it nicely secured in the 8th seat well in the trunk by using the existing retention strap... it fits perfectly with some space behind to tuck away some extra gear. I don't lose any trunk space or the ability to fold the rear seats, the 8th seat just stays in the garage until I need it. I have had a sealed box JL10W3 in a previous SUV that was great. I was between this sub and the 8" JL CP108LG-W3v3. I went with the Alpine since it was less money and the corners are angled, so I thought it might help with my placement. I have no regrets. For a ported 8" it has good extension down to 35Hz and does not sound sloppy.

Pros: Good bass, small package, solid construction.

Cons: Wish that the grille could be easily rotated so the logo was turned 90º

2011 Jetta TDI

Written By starrjohn03, Grand Blanc, MI on Thursday, June 06, 2013

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I had this sub installed in my lady's TDI pushed by an Alpine PDX-V9 amp along with ARC AUDIO XDi 6.2 components front and rear with a signal processor and OEM head unit. You will not be disappointed with this sub! Great bass that is tight. Pay the extra $20-30 for the Alpine remote bass adjust if using the same amp for when the kids are the car. We now have rich lows, tight highs, and full precise sound no matter what type or genre music you prefer!

Pros: Fills the car nicely, compact, do not need to drop the seats to hear it.

Cons: Price is always a little steep in my opinion.

Hands-on research

What's in the box?

Download owner's manual

  • Ported enclosure loaded with one 8" woofer
  • Installation notes
  • Warranty information
  • On-line product registration information

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

Product Research


Overview: The Alpine SBR-S84-4 is a ported enclosure with an 8" SWR-8D2 subwoofer installed, delivering tight, powerful bass. The enclosure, tuned to 30 Hz, is made from 3/8" MDF (3/4" for the front baffle) with internal bracing to ensure structural integrity. A single pair of spring post terminals on the left side of the enclosure accepts pin connectors, single or dual banana plugs, or bare wire up to 12-gauge. The sub's dual 2Ω voice coils are wired in series to present a 4Ω load. Alpine recommends using a 30 Hz subsonic filter for best results.

SWR-8D2 Subwoofer:

  • Kevlar Reinforced Pulp Cone: This 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 300W RMS / 1000W Peak.

Our Product Research Team

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