Rockford Fosgate R2SD4-12 Prime 12" R2 4-Ohm DVC Shallow Subwoofer

12" Shallow 4-Ohm DVC Subwoofer 200W RMS, Elevated Shallow Motor Assembly, Mica-Injected Polypropylene Cone, StampCast Basket. Sealed Enclosure Only.

Product Overview

The Rockford Fosgate Prime R2SD4-12 is a 12" 4-Ohm Dual Voice Coil (DVC) shallow subwoofer rated at 200W RMS the 12" 4-Ohm variant of the R2 shallow platform. It combines the larger 12" cone area for increased bass output with the reduced mounting depth of the shallow elevated motor assembly, suited to sealed enclosures in under-seat, behind-seat, and other depth-constrained locations. Optimised for sealed enclosures only.

The 4-Ohm DVC provides wiring options of 2-Ohm (parallel), 8-Ohm (series), or 4-Ohm per coil for bi-amplification broader amplifier compatibility than the 2-Ohm DVC R2SD2-12 variant. Sold as an individual unit. Construction is consistent across the R2SD 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 (shallow)
• Voice coil configuration: Dual Voice Coil (DVC)
• Impedance: 4-Ohm per coil (2-Ohm parallel / 8-Ohm series / 4-Ohm biamp)
• Power handling (RMS): 200W (confirmed)
• Peak power: Not specified — confirm with Rockford Fosgate
• Motor assembly: Shallow (elevated motor structure)
• Sensitivity: Not specified — confirm with Rockford Fosgate
• Frequency response: Not specified — confirm with Rockford Fosgate
• Xmax: Not specified — confirm with Rockford Fosgate
• Mounting depth: Shallow — exact depth not confirmed (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 only ✓
• 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

• 12" Shallow Motor Assembly — Larger 12" cone area in a shallow format — more air movement and greater bass output than the 10" shallow models, with the same reduced mounting depth suited to depth-constrained installations.
• Sealed Enclosure Only — Optimised for sealed enclosures exclusively. Tight, accurate bass output matched to the shallow motor's design. Do not use in a vented enclosure.
• 200W RMS Power Handling — Confirmed 200W RMS.
• 4-Ohm DVC — Three Wiring Options:
  • 2-Ohm (parallel): Most common configuration — compatible with most 2-Ohm-rated mono amplifiers
  • 8-Ohm (series): Suits amplifiers with minimum impedance requirements above 4-Ohm
  • 4-Ohm per coil (biamp): Each coil to a separate amplifier channel
• Mica-Injected Polypropylene Cone — Stiffened polypropylene for accurate bass with moisture resistance.
• StampCast Basket with Integrated Spider Venting — Motor cooling via basket ventilation.
• Anodized Aluminium Voice Coil Former — Improved heat radiation.
• 12 AWG Compression Terminals — Secure wiring connection for 200W RMS.
• Linear Spider with Embedded 16 AWG Tinsel Leads — Consistent compliance; integrated leads reduce flex fatigue.

Technical Specs

Compatible With / Goes Well With

Enclosure — sealed only. Do not install in a vented enclosure.

Wiring:

• 2-Ohm → parallel (most common)
• 8-Ohm → series
• 4-Ohm per coil → biamp

Pairs well with:

• Rockford Fosgate T1000-1BDCP or T1500-1BDCP mono amplifiers at the appropriate impedance
• A shallow sealed 12" enclosure to Rockford Fosgate's recommended volume

Frequently Asked Questions

Can the R2SD4-12 be used in a ported enclosure?

No — the R2SD4-12 is optimised for sealed enclosures only. Do not install in a vented enclosure.

What are the wiring options for the 4-Ohm DVC?

2-Ohm (parallel — most common), 8-Ohm (series), and 4-Ohm per coil for bi-amplification.

What mounting depth is required?

Confirmed as shallow, but the exact millimetre figure is not in the supplier data. Confirm from the official Rockford Fosgate R2SD4-12 datasheet before purchasing.

What enclosure volume is recommended?

Not confirmed in the supplier data. Pull the Rockford Fosgate R2SD4-12 datasheet for the recommended sealed volume.

Why choose 4-Ohm DVC over 2-Ohm DVC for this application?

The 4-Ohm DVC wires to 2-Ohm or 8-Ohm — both widely supported by mono amplifiers. The 2-Ohm DVC's 1-Ohm parallel option requires an amplifier specifically rated stable at 1-Ohm, which many amps are not. The 4-Ohm DVC gives broader amplifier compatibility with no trade-off in the driver itself.