Rockford Fosgate RM112D2B Prime 12" Dual 2-Ohm Subwoofer - Black

Rockford Fosgate RM112D2B Prime Marine 12" Dual 2-Ohm Subwoofer 12" Marine Bass, 1-Ohm Ready, Black Finish

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Product Overview

The Rockford Fosgate RM112D2B is a black 12" dual 2-ohm subwoofer from the Prime marine range, purpose-built for marine watercraft and powersport applications. The black finish counterpart to the RM112D2 (white), the RM112D2B delivers identical 12" Prime marine subwoofer performance and complete true marine-grade construction with dual 2-ohm voice coils that wire in parallel for a 1-ohm load for maximum power extraction from 1-ohm stable mono amplifiers, or in series for a 4-ohm load for specific configurations.

Sharing every material and construction specification with the RM112D2 and RM112D4B 100% UV stable ASA injection-moulded plastic parts, UV and salt-fog resistant Santoprene surround, injection-moulded mineral-filled polypropylene cone with UV inhibitors, moisture and fatigue-resistant Aramid fibre spider, ultra-flexible silicone lead wire, and proprietary corrosion-resistant spring-loaded push terminals the RM112D2B is the choice for installations requiring 12" dual 2-ohm performance in a black finish. Compatible with sealed, vented, and infinite baffle installations. Colour-matched black grille and removable trim ring included.

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Key Specifications

• Driver size: 12"
• Voice coil configuration: Dual 2-ohm (DVC)
• Wiring options: 1 ohm (parallel) / 4 ohm (series)
• Enclosure compatibility: Sealed / vented / infinite baffle
• Plastic parts: 100% UV stable ASA injection-moulded
• Cone: Injection-moulded mineral-filled polypropylene with UV inhibitors
• Surround: UV and salt-fog resistant Santoprene
• Spider: Moisture, tear and fatigue-resistant Aramid fibre
• Lead wire: Ultra-flexible fully insulated silicone
• Input terminals: Proprietary corrosion-resistant spring-loaded push terminals
• Grille: Colour-matched black (included)
• Trim ring: Removable (included)
• Colour: Black
• True marine-grade compliant
• Power handling: Confirm with supplier
• Frequency response: Confirm with supplier
• Sensitivity: Confirm with supplier
• Mounting depth: Confirm with supplier
• Cutout diameter: Confirm with supplier
• Shipping weight: Confirm with supplier

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Features & Benefits

• Dual 2-ohm voice coils 1-ohm parallel or 4-ohm series wiring: Wired in parallel, the RM112D2B presents a 1-ohm load for maximum power extraction from 1-ohm stable mono amplifiers such as the Rockford Fosgate TM500X1br Power Marine 500W mono amplifier. Wired in series, it presents a 4-ohm load for specific configurations. Identical wiring options to the RM112D2 (white) the sole difference is the black finish.
• Black finish colour-matched grille and trim: The RM112D2B fills the gap in the Prime marine 12" range: dual 2-ohm voice coils in a black finish. Where the RM112D2 provides the same wiring in white and the RM112D4B provides dual 4-ohm in black, the RM112D2B combines 1-ohm parallel capability with the black aesthetic preferred in darker vessel interiors and powersport builds.
• 12" driver diameter maximum output in the Prime marine subwoofer range: At 12 inches, the RM112D2B moves more air per unit of excursion than the 10" RM110 range, producing deeper low-frequency extension and higher output levels from the same amplifier power the natural choice for builds where maximum marine bass performance is the priority.
• True marine-grade compliance: Meets Rockford Fosgate's true marine-grade standard with every component purpose-selected for UV, salt fog, moisture, and vibration resistance engineered for the outdoor marine and powersport environment from the component level up.
• 100% UV stable ASA injection-moulded plastic parts: ASA engineering thermoplastic specifically formulated to resist UV-induced colour fading, surface degradation, and structural embrittlement under prolonged direct sun exposure on Australian watercraft and powersport vehicles.
• UV and salt-fog resistant Santoprene surround: Santoprene thermoplastic rubber maintains consistent mechanical compliance under UV radiation and salt fog exposure where conventional rubber surrounds crack and foam surrounds degrade essential for long-term subwoofer performance and reliability on the water.
• Injection-moulded mineral-filled polypropylene cone with UV inhibitors: Mineral filling increases cone stiffness and dimensional stability, resisting moisture absorption and maintaining pistonic accuracy at high excursion levels. UV inhibitors prevent polymer chain degradation under direct sun exposure.
• Moisture, tear and fatigue-resistant Aramid fibre spider: Resists moisture absorption that would alter compliance characteristics in wet marine environments, providing superior tear and fatigue resistance during high-excursion 12" subwoofer use.
• Ultra-flexible fully insulated silicone lead wire: Maintains flexibility across the wide temperature range of Australian outdoor environments, resisting cracking and hardening in conditions where standard PVC insulation degrades over time.
• Proprietary corrosion-resistant spring-loaded push terminals: Fast, tool-free wiring connection with corrosion resistance appropriate for saltwater and estuarine environments where standard binding post materials accelerate galvanic corrosion.
• Sealed, vented, and infinite baffle installation compatibility: Confirmed compatible with free-air (infinite baffle) installation allowing direct mounting in vessel transom panels and powersport enclosures where a dedicated subwoofer box is impractical, consistent with the full RM1 Prime marine subwoofer range.
• Available in black or white: The RM112D2B is the black finish variant. The RM112D2 is the white finish variant with identical voice coil specification confirm part numbers with your supplier for both options.

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Technical Specs

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Compatible With

• Rockford Fosgate TM500X1br Power Marine 500W mono amplifier (1-ohm parallel wiring natural pairing)
• Rockford Fosgate PM300X1 Punch Marine 300W mono amplifier (4-ohm series wiring confirm power output at 4 ohms with supplier)
• Sealed, vented, and infinite baffle marine enclosures confirm recommended enclosure volume with Rockford Fosgate documentation before building a sealed or vented box
• Marine vessels: bow riders, ski boats, pontoons, fishing boats, and tinnies with transom or hull subwoofer mounting locations
• Powersport applications: UTVs and side-by-sides with under-seat or roll-cage subwoofer enclosures
• RM112D2 (dual 2-ohm white variant) same voice coil spec, white finish
• RM112D4B (dual 4-ohm black variant) same black finish, 2-ohm parallel wiring for different amplifier pairings
• RM110D2B (10" dual 2-ohm black variant) for applications where 12" diameter is too large

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Frequently Asked Questions

What is the difference between the RM112D2B and RM112D2? Both are 12" Prime marine subwoofers with dual 2-ohm voice coils (1-ohm parallel / 4-ohm series) and identical construction, materials, and marine-grade compliance. The RM112D2B is the black finish variant; the RM112D2 is the white finish variant. Choose based on your vessel interior colour preference and aesthetic requirements.

What is the difference between the RM112D2B and RM112D4B? Both are 12" Prime marine subwoofers in a black finish with identical construction and marine-grade compliance. The RM112D2B has dual 2-ohm coils (1-ohm parallel / 4-ohm series) for 1-ohm stable amplifier pairings. The RM112D4B has dual 4-ohm coils (2-ohm parallel / 8-ohm series) for 2-ohm stable amplifier pairings. Choose based on your amplifier's stable impedance rating.

What impedance does the RM112D2B present to the amplifier? The RM112D2B has dual 2-ohm voice coils. Wired in parallel, it presents a 1-ohm load suitable for 1-ohm stable mono amplifiers such as the TM500X1br. Wired in series, it presents a 4-ohm load. Confirm your amplifier's stable impedance rating before wiring.

Can the RM112D2B be installed in infinite baffle without an enclosure? Yes. The RM112D2B is confirmed compatible with infinite baffle (free-air) installation, allowing direct mounting in vessel transom panels and powersport enclosures without a dedicated subwoofer box. Confirm the recommended free-air parameters with Rockford Fosgate documentation before installing in this configuration.

Is the black finish UV stable for permanent outdoor marine installation? Yes. The black finish is produced using 100% UV stable ASA injection-moulded plastic parts specifically formulated to resist UV-induced colour fading, surface degradation, and structural embrittlement under prolonged direct sun exposure maintaining the black finish integrity under the intense UV conditions common on Australian watercraft.