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Rockford Fosgate R2SD2-12

Prime R2 Series 12" shallow subwoofer with dual 2-ohm voice coils

5 Reviews | 2 questions - 3 answers

Item # 575R2SD212

This item is no longer available.

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Our take on the Rockford Fosgate R2SD2-12

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 R2SD2-12 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 2-ohm voice coils allow you to wire this sub for 1- or 4-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 4 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Product Highlights:

  • 12" shallow-mount subwoofer with dual 2-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: 43-250 Hz
  • sensitivity: 81 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

Great sub hits really hard in my crew cab f250

Clay, Ruston, LA

What's in the Box:

  • One shallow-mount 12" Dual 2-ohm voice coil woofer
  • Eight 1-1/8" Self-tapping screws
  • 4mm Allen bit
  • Installation and Operation manual (English/ French/ Spanish/ German)

Rockford Fosgate R2SD2-12 Reviews

Average Customer Review(s):

(5 Reviews)


Clay from Ruston, LA on 8/1/2016

Crutchfield Customer Review (What's this?)

Great sub hits really hard in my crew cab f250



Not what you expect from Rockford Fosgate.

J9_ from rancho cordova, CA on 3/10/2016

Crutchfield Customer Review (What's this?)

This sub woofer is not of the quality I have come to expect over the years from Rockford Fosgate. The build quality is generally poor with some separation and very uneven bonding of the poly-foam surround. This speaker has a low output, I built a custom sealed box with .9 cubic feet and powered it with a RF 500 watt rms amplifier and got very poor performance. The speaker bottoms out very easily and has a ton of distortion being powered and enclosed to RF's specs. I am returning this speaker and have purchased this subs big brother the Rockford Fosgate P3SD4-12 also from Crutchfield I had a great customer service experience in getting my new sub and returning my old one. The Rockford Fosgate P3SD4-12 is incredible its night and day compared to its little bro, Excellent build quality, superior, materials, and most important Killer performance it hits hard and clean with minimal to no distortion and has an incredible amount of output for a shallow mount, It hits like two twelves in a band-pass ! I am super happy with both my new sub, and my experience with Crutchfield

Pros: none dont buy this unless you have no other choice Absolute Garbage ! Shame on you Rockford Fosgate !

Cons: Everthing

love it....

Tim H from Muscatine Iowa on 2/11/2015

Crutchfield Customer Review (What's this?)

I put it in my car cause I haven't run the wiring on my truck yet, but it works well.

Pros: Heavy bass great quality. Directions. For wiring

Cons: It is a little different setup from a standard sub I was unsure how to wire it at first

Rockford Fosgate R2SD2-12

Scott from Chicago Park, CA on 10/3/2014

Just got one of these hooked up today. I must say I couldn't believe the sound that this one sub puts out in my truck( 2001 ford f350 crew cab). I bought it in a pre fab enclosure and it sounds amazing. It'll crank as loud as the head unit will go and no distortion, crisp clean bass, and hits the lows fairly well. If your looking for something that's not gonna break the bank and sounds great. This is it!



Rockford 12 ' s low profile not low on bass.

Charlie from Tallahassee, FL on 9/10/2014

Crutchfield Customer Review (What's this?)

This is the bass I always wanted in a thin package. In a custom cabinet I found online, two of these fit behind the seat of my crew cab Ford F250. Nobody knows they are there. With 500 watts rms running mono @ 2 ohms, these have a solid, clean bass that is as perfect as I have found. No distortion at higher volumes either.

Pros: Nice thin fit. Clean sound. Solid construction.

Cons: Probably gonna get a ticket now for loud stereo....


Hands-on research

Product Research


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 2-ohm Voice Coils: This woofer features dual 2-ohm voice coils to offer wiring flexibility. When the voice coils are wired in parallel the woofer presents a 1-ohm mono load, when wired in series it presents a 4-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.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Been a Rockford fan all my life, so why change what ain't broke [ Dale  Oct 05, 2016 ]
The price and the size [ Michael  Mar 11, 2016 ]

2 questions already asked

Tech support is included with your purchase from Crutchfield, feel free to contact our Tech Support team. They can walk you through the connections on the product. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. [ Kenny  Oct 11, 2016 ]  Staff
Yes great bass I love it [ JOHN  Jul 06, 2016 ]
it hits nice and it probably would if you have 2 of them. I only have one and it hits nice. But for bottom bass Its not too clean. [ Michael  Jun 20, 2016 ]