Rockford Fosgate Prime R2SD4-12

500W Peak (250W RMS) 12" Prime Stage 2 Shallow Mount Dual 4-ohm Subwoofer

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• Peak Power: 500 watts
• RMS Power: 250 watts
• Impedance: Dual 4 ohms
• Mica Injected Polypropylene - MIPP Cone
• Poly-Foam Surround
• Mount depth: 3.602"
• Sensitivity: 85 dB

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Product Highlights

• Peak Power: 500 watts
• RMS Power: 250 watts
• Impedance: Dual 4 ohms
• Mica Injected Polypropylene - MIPP Cone
• Poly-Foam Surround
• Mount depth: 3.602"
• Sensitivity: 85 dB


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Authorized dealer

Rockford Fosgate Prime Stage 2 Subwoofer

Eliminate Entry Level and Go Straight to Prime

Prime subwoofers are ready to rock and are the perfect first step into performance audio.The Prime R2 12" subwoofers have a peak power rating of 500 watts and a continuous RMS power rating of 250 watts. This makes them an ideal subwoofer for anyone looking to add some modest low end to their car audio system. The Prime R2 drivers feature an anodized aluminum voice coil formers for extreme heat dissipation that allow the driver to perform at optimum level during long hard hitting sessions. These subwoofers are the way to go when looking for a woofer that is built with quality & performance in mind and has been designed by industry's leading car audio manufacture.

These woofers, like their Punch brethren, are built using many of the same speaker technologies that Rockford has been famous for over 30 years for and you won't break the bank buying one. Simply put, the Prime seriesof woofers are held to the same standards of quality and performance as any other Rockford woofer but delivered at an affordable price.

Anodized Aluminum Voice Coil Former

Anodized Aluminum Voice Coil Former

By using an anodized aluminum voice coil former on their subwoofers, Rockford Fosgate is able to dissipate heat from the voice coil more efficiently. A hot voice coil can melt the adhesive bonds, which will lead to eventual subwoofer failure. The aluminum voice coil former acts as a heat-sink to dissipate thermal build-up on the voice coil cool during high SPL conditions.

CEA-2031 Rockford Fosgate Subwoofers

Conforms to CEA-2031

Rockford Fosgate has built this subwoofer to conform to the CEA-2031 loudspeaker power handling industry standards. This means that you can trust the subwoofer to have the capacity to safely handle the continuous (RMS) power rating. Having a CEA-2031 power handling is important when matching a subwoofer to an amplifier because the power ratings are accurate.

Rockford Fosgate Stitched Tinsel Leads

Stitched Tinsel Leads

To improve the reliability and performance by reducing fatigue and possible shorting, Rockford Fosgate has stitched the tinsel leads to the spider. The multipoint periodic stitching lead wires reduce the mass of the tinsel leads to spread the stress over a greater area. This improves the reliability and performance of the subwoofer.

Product Details:

  • 12" Dual 4 ohms Prime R2 Series Subwoofer
  • Power Handling:
    • Peak: 500 watts
    • RMS: 250 watts
  • Mica Injected Polypropylene - MIPP Cone
  • Poly-Foam Surround
  • 12 AWG compression terminals
  • Linear spider with embedded 16 AWG tinsel leads
  • Optimized for sealed enclosures
  • Shallow Motor Assembly
  • Integrated PVC trim ring
  • StampCast basket with integrated spider venting
  • 2" High Temperature Aluminum Voice coil
  • 10 mm Xmax
  • 51 oz. Single Stacked magnet motor structure
  • Frequency Response: 43 - 250 Hz
  • Resonance Frequency (Fs): 30.3 Hz
  • Sensitivity: 85 dB
  • Recommended sealed box volume: 0.90 cubic feet
  • Recommended ported box volume: 1.79 cubic feet
  • Top-mount depth: 3.602"
  • Cutout diameter: 11.25"
  • CTA-2031 Compliant
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

  • Priced Individually

Subwoofer Wiring Guide

Wiring Guide to Wire 1 Rockford Fosgate Prime R2SD4-12 Subwoofer

Mono Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 2 Rockford Fosgate Prime R2SD4-12 Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp - Bridged

Wiring Guide to Wire 3 Rockford Fosgate Prime R2SD4-12 Subwoofers

Mono Amp

4 Channel Amp

Wiring Guide to Wire 4 Rockford Fosgate Prime R2SD4-12 Subwoofers

Mono Amp

2 Channel Amp

2 Channel Amp - Bridged

4 Channel Amp

Specifications & Details

Subwoofer Specifications
Prime R2 Series
Subwoofer Size
Peak Power Handling
500 watts
RMS Power Handling
250 watts
Voice Coil(s)
Impedance (Per Voice Coil)
4 ohms
Voice Coil Material
Voice Coil Diameter
Frequency Response
43 - 250 Hz
85 dB
Xmax (millimeters)
10 mm
Subwoofer Design
Round / Circle
Main Cone Color
Woofer Composition
Mica Injected Polypropylene - MIPP
Woofer Surround
Magnet Structure
Single Stacked
Magnet weight
51 oz.
Subwoofer Grille
Re-Cone Kit Available
CTA-2031 Compliant
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
Minimum Sealed Box Volume
0.90 cubic feet
Minimum Ported Box Volume
1.79 cubic feet
Top-Mount Depth (Mounting Depth)
Cutout Diameter
Shallow Mount Installation
Electromechanical Parameters
Free-Air Resonance (Fs)
30.3 Hz
Equivalent Compliance (Vas)
65.4 liters
Total Speaker Q Value (Qts)
Electrical Q Value (Qes)
Electrical Resistance of Voice Coil (Re)
6.80 ohms
Mechanical Q Value (Qms)
Efficiency Bandwidth Product (EBP)
What is in the box?
User manual
WITB: Subwoofers
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details


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Product and How-to Videos

  • Car Subwoofer Size Buying Guide | What Size of Sub Should I Get?
  • How to Install a Car Subwoofer in a Box

Customer Ratings & Reviews

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Customer Reviews

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Rockford Fosgate R2SD4-12

At first i was very unhappy with these woofers. But after a week or two of using them they seemed to get louder and better. Still not what i was hoping for but i can't complain with my crappy amp. I have a crew cab with two of these behind the seat. They do a good job of putting out the bass threw out the cab.

By Jason on November 3, 2013


found this helpful.

Very nice shallow subwoofer

I bought this for an install I did for a friend. I wish we could have used a larger box. This is a great sub that would be even better in large box.

By Mike on November 24, 2013


found this helpful.

Subs review

i would recommend these to anyone. they sound great. Haven't had a single problem with them. 2002 chevy silverado 1500hd crew cab. they're under the seats.

By Nick on July 29, 2013


found this helpful.


I have 2 of these installed in a sealed unit on the mid gate of a 2002 avalanche. I have a planet audio ac1800.5 amp pushing them and they sound sweet. I like the tight clean sound but the will boom with the best.

By Bruce on April 3, 2014


found this helpful.

Nothin like a Fosgate

I am i huge fan of this brand and the R2sd4-12 was just another example of why it is such an amazing brand. This is an excellent subwoofer, it's cheap, and it fits in small spaces. Can't ask for much more.

By Alex on June 8, 2013


found this helpful.


I did order another one and wired the dual 4 ohm voice coils in parallel and surprisingly I put a multi-meter up to it and measured for ohms and got a reading of 3.6 ohms on both subs. Not bad, not bad at all.

By dkeproductions on May 8, 2014


found this helpful.

Very good shallow mounts

Mounted 2 of these in a sealed box under the rear seat in a supercrew truck running 1000 watts @ 1 ohm. The box spec was just over .5 cu ft each and even with poly fill the air space is a bit under but I heard these could probably handle it and they did. I've worked at a pro installer years ago and I would not have expected the bass quality these produce in such a shallow mount and tight box. I'm pretty impressed and at this price I'd say they're tough to beat in terms of value.

By Scott on June 29, 2013


found this helpful.


If You're Looking For Huge Bass, These Are Not The Subs You Want. But If You're Looking For Great Sound Quality With GoOd Thump In A Small AreA, These Are What You Want! Tight And Responsive, Clean SOund, And A Great Product. Would Buy Again!

By michael on November 19, 2013


found this helpful.

Great Sound!

The speaker sounds incredible. I built a speaker box to replace the stock floor in the hatch area of my Mazda3 because I didn't want to use up all of my valuable storage space with a speaker box. Since my dimensions only allowed me a 3" mounting depth and approx. a 1cu. ft enclosure volume, I had to start shopping around for a shallow mount speaker that would work with such a small enclosure.

I have the speaker powered by an old Kicker ZR360 in bridged mode @ 4 ohms. With this set up, I'm putting about 360 watts RMS into the speaker. Let me tell you, the speaker downright bumps.

I wouldn't hesitate to recommend this speaker to anyone looking for a shallow mount and/or low volume speaker setup.

By Joe on June 5, 2013


found this helpful.

Great value!

It's hard to find a better value than this shallow sub. It doesn't hit as hard as my 12" L7 on the same Punch 300 amp but that's kind of comparing broccoli to asparagus.. Buy this sub! Awesome value.

By Mike on November 12, 2013


found this helpful.


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