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Rockford Fosgate R2SD4-12

Prime R2 Series 12" shallow subwoofer with dual 4-ohm voice coils

5 Reviews | 4 questions - 4 answers

Item #: 575R2SD412

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Outlet: Scratch & Dent

Was: $79.99

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Rockford Fosgate R2SD4-12

Overview

Our take on the Rockford Fosgate R2SD4-12

Rockford Fosgate's Prime R2 shallow-mount subs deliver satisfying bass even in smaller cars where space is tight. A special elevated motor structure lets these low-profile subs work in extremely compact enclosures, while still handling plenty of power.

Rockford Fosgate's Prime R2 shallow-mount subs deliver satisfying bass even in smaller cars where space is tight. A special elevated motor structure lets these low-profile subs work in extremely compact enclosures, while still handling plenty of power.

The R2SD4-12 sub features a 12" mica-injected polypropylene cone that works with a high-density poly-foam surround to punch out fat, deep notes. This shallow-mount workhorse will handle up to 250 watts RMS, with a mounting depth of only 3-5/8". Rockford Fosgate stitches the tinsel leads that carry the signal to the voice coils directly into the cone, so they'll hang tough through heavy use. The stamped solid-steel frame offers the same venting found in standard-mount Rockford Fosgate subs to keep this sub running cool.

Dual 4-ohm voice coils allow you to wire this sub for 2- or 8-ohm impedance, giving you more flexibility in setting up your system. Rockford Fosgate optimizes this Prime sub for both sealed and ported enclosures so you can choose the type of bass you want in your ride.

To drive this single subwoofer, we recommend a mono amplifier rated between 200 and 375 watts RMS at 2 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

great sub at a great price the sound is amazing and I cant say enough about crutchfield, ordering was easy, shipped and delivered quickly i'm only ordering from you guys from now on thanks!

ray l, Florida

What's in the Box:

  • One shallow-mount 12" Dual 4-ohm voice coil woofer
  • Eight 1-1/8" Self-tapping screws
  • 4mm Allen bit
  • Installation and Operation manual (English/ French/ Spanish/ German)

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

Product Highlights:

  • 12" shallow-mount subwoofer with dual 4-ohm voice coils
  • mica-injected polypropylene woofer cone with poly-foam surround
  • stamped solid-steel frame
  • power range: 100-250 watts RMS (500 watts peak power)
  • frequency response: 29-250 Hz
  • sensitivity: 85 dB
  • top-mount depth: 3-5/8"
  • sealed box volume: 0.9 cubic feet
  • ported box volume: 1.79 cubic feet
  • warranty: 1 year
  • Our 60-day money-back guarantee
Reviews

Rockford Fosgate R2SD4-12 Reviews

Average Customer Review:

5 Reviews

great sub

Written by: ray l from Florida on February 15, 2015

Crutchfield Customer Review (What's this?)

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

great sub at a great price the sound is amazing and I cant say enough about crutchfield, ordering was easy, shipped and delivered quickly i'm only ordering from you guys from now on thanks!

Pros: easy hook up quality speaker for the price

Cons: none

Great Subs for the Price

Written by: Scar from Texas on February 8, 2015

Crutchfield Customer Review (What's this?)

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

Since my last two subs finally blew I needed some great subs. I bought the low profile ones due to having to put them in the box that fits under my chevy's back seats. Was worried if they would have the sound I wanted and man do they ever! I love feeling like I am at the concert and feeling the bass in my chest, well these subs do that for me. I have two of these conected to an 800W amp and they deliver the bass I wanted. Overall, not only do they sound great but look clean and professional.

Pros: Sound Great! Cheap

Cons: None

why did i wait

Written by: dpevans from Fort Wayne on December 11, 2013

Crutchfield Customer Review (What's this?)

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

why did i wait to upgrade? I like the bass to fit the music not overpower it. this sub makes you feel the music without taking over.

Pros:

Cons:

Excellent

Written by: Good but not the best from South Carolina on March 6, 2013

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

I recently had to purchase these r2 subs after switching vehicles and my p3 rocksford's wouldn't fit under my seat , and I was a little doubtful that they would sound anything like my p3's but once I hooked them up and played a bass test cd I made all that doubt went away. These speakers sound really good in my custom built ported down firing enclosure wired at 1ohm. Just goes to prove why I will never diverge from Rockford fosgates quality. They always put out the best!!!

Pros: Will fit in a small box and sound great if u have the correct air space and they are wired right.

Cons: No comment. They sound really good

Booooom

Written by: Daren from Spokane WA on September 5, 2012

Crutchfield Customer Review (What's this?)

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

I was concerned this subwoofer wouldn't sound as good because it is the shallow design. I was wrong. I built a downward facing sealed box that was only 6" deep so it could sit under my back seat. It sounds absolutely awesome. I did give it the recommended .9 cubic feet of air space, and I sealed the box well. This thing gives me as much bass as I could ever dream of, and even more if I ever wanted any.

Pros: Awesome sound. Thin size, so it fits under/behind seats.

Cons: None

Details

Hands-on research

What's in the box?

Download the Rockford Fosgate R2SD4-12 manual

  • One shallow-mount 12" Dual 4-ohm voice coil woofer
  • Eight 1-1/8" Self-tapping screws
  • 4mm Allen bit
  • Installation and Operation manual (English/ French/ Spanish/ German)

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

Product Research

Features

Shallow Mount Design: The Rockford Fosgate Prime R2 Shallow Subwoofer is designed and engineered with a much smaller motor assembly which reduces the overall depth of the woofer allowing it to fit in shallower enclosures and tighter locations of your vehicle.

Dual 4-ohm Voice Coils: This woofer features dual 4-ohm voice coils to offer wiring flexibility. When the voice coils are wired in parallel the woofer presents a 2-ohm mono load, when wired in series it presents an 8-ohm mono load.

Spring Post Assembly: The woofer features compression input terminals with attached 16-gauge stitched tinsel lead wires. The nickel plated spring posts will accept pin connectors, single banana plugs, and bare wire up to 12-gauge.

Sealed Box Volume: Rockford Fosgate recommends a sealed enclosure with an optimum internal volume of 0.9 cubic feet (from 0.75 to 1.25 cubic feet is acceptable). Sealed enclosures provide the most control over a woofer, will handle a lot of power, and provide accurate sonic reproduction, making them suitable to all types of music.

Vented Box Volume: Rockford Fosgate recommends a vented enclosure with an internal volume of 1.79 cubic feet using a 4" diameter x 11.8" long port tube; this yields a tuning frequency of 40 Hz. Ported (or vented) enclosures typically provide better overall efficiency than sealed so they are suitable for use with smaller amplifiers, giving you more bass output from less power. However, this efficiency comes at the expense of very low frequency output (below 35 Hz).

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 verify what’s in the box, 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.

Accessories
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Needed a reasonably priced speaker [ Gerold  May 17, 2016 ]
I needed a shallow sub, since I drive a former police car, and have a full size spare tire, sitting in the dead center of my trunk. [ A  Apr 24, 2016 ]

4 questions already asked

Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system. [ Krissy  Jan 04, 2016 ]  Staff
I forwarded your question to an Advisor and they responded with the following: I'm not sure exactly what the value would be on a used sub but I personally think that is a good price for two. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  Jan 01, 2015 ]  Staff
Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system. [ Krissy  Sep 05, 2014 ]  Staff
I forwarded your question to an Advisor and they responded with the following: You can use those in either a sealed or ported box. A sealed box will need a volume around 0.9 and a ported 1.79. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  May 20, 2014 ]  Staff
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