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Rockford Fosgate Prime R2D4-12

500W Max (250W RMS) 12" Prime Stage 2 Dual 4 ohm Subwoofer

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Order within 31 hrs 47 mins to ship 1/23

Arrives by Wednesday, Jan. 25 to zip 20147

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Key Benefits

  • 12" Dual 4 ohm Prime Stage 2 Series Subwoofer
  • Power Handling:
    • Peak: 500 watts
    • RMS: 250 watts
  • Recommended power range: 200 - 300 watts RMS
  • CEA-2031 Compliant
  • Klippel Verified
  • 12 AWG compression terminals
  • Anodized aluminum voice coil former
  • Injection molded polypropylene cone
  • Tear & fatigue resistant poly-cotton spider
  • StampCast basket with integrated spider venting
  • Linear spider with embedded 16 AWG tinsel leads
  • High density compressed half-roll sealed poly-foam surround
  • Optimized motor magnetics with extended pole and bumped vented backplate
  • Fatigue resistant and reduced strain "stitched on" flexible lead wire design
  • Multi-point high-temp/high-strength neck joint bonding technique

  • Semi-flexible PVC removable protective motor cover
  • Optimized for both sealed and vented enclosures
  • All metal compression input terminal assembly
  • Heavy guage proprietary stamped steel frame
  • Mounting Depth: 5.067"
  • Cutout Diameter: 11.25"
  • Magnet Weight: 47.70 oz
  • Frequency Response: 43 - 250 Hz
  • Xmax: 6.5 mm
  • Sensitivity: 89 dB @ 1 watt / 1 meter
  • Recommended Ported Enclosure: 1.79ft³ @45.0 Hz
  • Recommended Sealed Enclosure: 1.02ft³ @51.1 Hz
  • Matching Amplifiers: (one driver)
  • Matching Amplifier: (two drivers)
  • Authorized Internet Dealer
  • 90 Day Sonic Electronix Warranty

  • Priced Individually

Check out the Rockford Fosgate R2D4-12 Owner's Manual

Check out the Rockford Fosgate R2D4-12 Data Sheet

Tips for Installing the R2D4-12 Subwoofer


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
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

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Average Attribution Rating

Browse 4 questions and 6 answers
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Why did you choose this?
Sonic Electronix Store
I have always loved Rockford Fosgate. I have owned 3 sets. It's time to udate to a new pair and these seem to be a great deal.
Mark Reynolds on Sep 23, 2015
Replacement from busting my old one. This one is better than the one I had and i will be coming here for more purchases for my car
dylan c on May 31, 2015
best amp for 2 subs?
Alec L on Nov 20, 2014
Best Answer: Depends on the impedance of the subs. I always use class d mono block amps. Match the subs to the amp or match the amp to the subs. Fosgate is always number 1 pick. I personally don't like this set up as it only allows either a 1 ohm or 4 ohm set up. I would use the r2d2 12's, wire the voice coils in a series to make each sub a 4 ohm load, then wire the subs parallel to the amp with a final load of 2 ohm. The r500x1d would be perfect for that set up. If you are using Fosgate r2d4 12's, the use you will have to spend more money on the amp to get one that will push higher watts to a 4 ohm load or one that is capable of handling a 1 ohm load. For that I would recommend the p500x1bd.
Reply (1) · Report · Michael P on Nov 21, 2014
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How tall are theses subwoofers? Trying to see if it will fit in my box.
A shopper on Feb 11, 2016
Best Answer: 5.067" is the mounting depth of this sub.
Reply · Report · Luis F on Feb 12, 2016
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would this sub be compatable with the Sony XMN502 2.1 channel amp? Ive never wired up a DVC sub so i dont know if the amp being 2 channel at 2ohms will work with your wiring guides.
jack1 on Jul 10, 2015
Best Answer: Hell Jack,

Unfortunately, the Sony XMN502 is not a good match for the R2D4-12 . The subwoofer can be wired in parallel to a 2ohm load, but bridging the amp is NOT stable below 4ohms. Alternatively, the sub can be wired in series to an 8ohm load, but the amplifier will not put out enough power to driver the woofer properly. That amplifier put out decent power for door speakers, but not a subwoofer(s), and as such should be upgraded to a proper monoblock. Preferably one that is doing ~250w @2ohms. give our sales team a call for help.
Reply · Report · Rick MStaff on Jul 10, 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: Rockford Fosgate Prime R2D4-12