Description
12" 4-Ohm Dual Voice Coil Subwoofer 250W RMS, Mica-Injected Polypropylene Cone, StampCast Basket with Spider Venting, 12 AWG Compression Terminals.
Product Overview
The Rockford Fosgate Prime R2D4-12 is a 12" 4-Ohm Dual Voice Coil (DVC) subwoofer rated at 250W RMS the 12" 4-Ohm variant of the R2 series, combining the larger 12" cone with the 4-Ohm DVC wiring flexibility that suits a wider range of amplifier impedance ratings than the 2-Ohm DVC variant. The 4-Ohm DVC provides wiring options of 2-Ohm (parallel), 8-Ohm (series), or 4-Ohm per coil for bi-amplification. Optimised for sealed and vented enclosures. Sold as an individual unit.
Construction is consistent across the R2 platform: mica-injected polypropylene cone, anodized aluminium voice coil former, linear spider with embedded 16 AWG tinsel leads, StampCast basket with integrated spider venting, 12 AWG compression terminals, and integrated PVC trim ring.
Key Specifications
- Subwoofer size: 12 inch
- Voice coil configuration: Dual Voice Coil (DVC)
- Impedance: 4-Ohm per coil (2-Ohm parallel / 8-Ohm series / 4-Ohm biamp)
- Power handling (RMS): 250W (confirmed)
- Peak power: Not specified — confirm with Rockford Fosgate
- Sensitivity: Not specified — confirm with Rockford Fosgate
- Frequency response: Not specified — confirm with Rockford Fosgate
- Xmax: Not specified — confirm with Rockford Fosgate
- Voice coil former: Anodized aluminium
- Cone: Mica-injected polypropylene
- Surround: Not specified — confirm with Rockford Fosgate
- Spider: Linear with embedded 16 AWG tinsel leads
- Basket: StampCast with integrated spider venting
- Input terminals: 12 AWG compression terminals
- Trim ring: Integrated PVC
- Enclosure compatibility: Sealed and vented ✓
- Mounting depth: Not specified — confirm with Rockford Fosgate
- Cutout diameter: Not specified — confirm with Rockford Fosgate
- Sold as: Individual unit
- Weight: Not specified — confirm with Rockford Fosgate
- Warranty: Not specified — confirm with Rockford Fosgate
Features & Benefits
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12" Cone — Larger cone area than a 10" driver, moving more air per stroke for increased bass output and generally lower frequency extension.
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250W RMS Power Handling — 250W RMS confirmed per the product description — the same sustained rating as the 12" R2D2-12 at the same power level.
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4-Ohm DVC — Three Wiring Options:
-
2-Ohm (parallel): Maximum output from amplifiers rated stable at 2-Ohm
-
8-Ohm (series): Compatible with amplifiers having a minimum impedance above 4-Ohm
-
4-Ohm per coil (biamp): Each coil driven by a separate amplifier channel
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Mica-Injected Polypropylene Cone — Stiffened polypropylene for reduced cone flex and accurate bass reproduction with moisture resistance.
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StampCast Basket with Integrated Spider Venting — Ventilation openings in the basket cool the motor during sustained operation — a construction feature Rockford Fosgate notes is "typically reserved for more expensive models."
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Anodized Aluminium Voice Coil Former — Improved heat radiation over plain aluminium for extended thermal capacity.
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12 AWG Compression Terminals — Secure, low-resistance wiring connection appropriate for 250W RMS operation.
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Linear Spider with Embedded 16 AWG Tinsel Leads — Consistent compliance and integrated leads for reduced flex fatigue at the connection point.
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Optimised for Sealed and Vented Enclosures — Both enclosure types confirmed.
Technical Specs
| Specification |
Detail |
| Brand |
Rockford Fosgate |
| Part Number |
R2D4-12 |
| Series |
Prime R2 |
| Subwoofer Size |
12 inch |
| Voice Coil |
Dual Voice Coil (DVC) |
| Impedance per Coil |
4-Ohm ✓ |
| Wiring Options |
2-Ohm (parallel) / 8-Ohm (series) / 4-Ohm biamp ✓ |
| Power Handling (RMS) |
250W ✓ |
| Peak Power |
Not specified |
| Sensitivity |
Not specified — confirm with Rockford Fosgate |
| Frequency Response |
Not specified — confirm with Rockford Fosgate |
| Xmax |
Not specified — confirm with Rockford Fosgate |
| Voice Coil Former |
Anodized Aluminium |
| Cone |
Mica-Injected Polypropylene |
| Surround |
Not specified — confirm with Rockford Fosgate |
| Spider |
Linear, Embedded 16 AWG Tinsel Leads |
| Basket |
StampCast with Integrated Spider Venting |
| Input Terminals |
12 AWG Compression Terminals |
| Trim Ring |
Integrated PVC |
| Enclosure Type |
Sealed and Vented ✓ |
| Mounting Depth |
Not specified — confirm with Rockford Fosgate |
| Cutout Diameter |
Not specified — confirm with Rockford Fosgate |
| Sold As |
Individual Unit |
| Weight |
Not specified — confirm with Rockford Fosgate |
| Warranty |
Not specified — confirm with Rockford Fosgate |
Compatible With / Goes Well With
Suitable enclosure types:
- Sealed — tight, accurate bass
- Vented — higher efficiency output at the tuning frequency
Wiring configurations:
- 2-Ohm → both coils in parallel (common choice for maximum amplifier output)
- 8-Ohm → both coils in series
- 4-Ohm per coil → bi-amplification
Pairs well with:
- Rockford Fosgate T1000-1BDCP, T1500-1BDCP, or T2500-1BDCP mono amplifiers at the appropriate wiring impedance
Frequently Asked Questions
What are the wiring options for the R2D4-12's 4-Ohm DVC?
The 4-Ohm DVC provides three configurations: 2-Ohm (both coils in parallel — most common for maximum output), 8-Ohm (both coils in series — suits amplifiers with higher minimum impedance), and 4-Ohm per coil for bi-amplification with separate amplifier channels.
What amplifier power is appropriate for the R2D4-12?
250W RMS matched at the selected wiring impedance. Confirm the amplifier's RMS output at 2-Ohm (parallel) or 8-Ohm (series) before purchasing.
What enclosure volume is recommended?
Enclosure volume and vent specifications are not confirmed in the supplier data. Pull the official Rockford Fosgate R2D4-12 datasheet for recommended sealed and vented volumes.
Is this the same as the R2D2-12 but with different impedance?
The R2D2-12 and R2D4-12 share the same 12" R2 platform and 250W RMS rating. The difference is the voice coil impedance: R2D2-12 is 2-Ohm per coil (1-Ohm parallel / 4-Ohm series), while the R2D4-12 is 4-Ohm per coil (2-Ohm parallel / 8-Ohm series). Select based on your amplifier's stable impedance rating and preferred wiring configuration.
What is the advantage of 4-Ohm DVC over 2-Ohm DVC?
The 4-Ohm DVC wires to 2-Ohm or 8-Ohm, which are more universally compatible with a wider range of amplifiers than the 2-Ohm DVC's 1-Ohm parallel option. Most amplifiers are rated stable at 2-Ohm; the 4-Ohm DVC at 2-Ohm parallel is the most common subwoofer wiring configuration in car audio installations.
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