Rockford Fosgate RM110D4B Prime 10" Dual 4-Ohm Subwoofer - Black

Rockford Fosgate RM110D4B Prime Marine 10" Dual 4-Ohm Subwoofer Marine-Grade Bass, 2-Ohm Ready, Black Finish

Product Overview

The Rockford Fosgate RM110D4B is a black 10" dual 4-ohm subwoofer from the Prime marine range, purpose-built for marine watercraft and powersport applications. The 2-ohm stable counterpart to the RM110D2B, the RM110D4B shares the complete Prime marine-grade construction and weatherproofing technology of the D2 variant 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 with dual 4-ohm voice coils that wire in parallel for a 2-ohm load or in series for an 8-ohm load.

The RM110D4B is the natural pairing for 2-ohm stable mono amplifiers such as the Rockford Fosgate PM300X1, and is compatible with sealed, vented, and infinite baffle installations giving it the same broad enclosure flexibility as the RM110D2B for transom panel, bulkhead, and powersport free-air mounting where a dedicated subwoofer enclosure is impractical. Colour-matched black grille and removable trim ring included.

Key Specifications

• Driver size: 10"
• Voice coil configuration: Dual 4-ohm (DVC)
• Wiring options: 2 ohm (parallel) / 8 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

Features & Benefits

• Dual 4-ohm voice coils 2-ohm parallel or 8-ohm series wiring: The key differentiator from the RM110D2B. Wired in parallel, the RM110D4B presents a 2-ohm load the natural pairing for 2-ohm stable mono amplifiers including the Rockford Fosgate PM300X1 Punch Marine mono amplifier. Wired in series, it presents an 8-ohm load for specific multi-driver or bridged amplifier configurations. Choose the RM110D4B when your amplifier is 2-ohm stable; choose the RM110D2B for 1-ohm stable amplifiers.
• 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 not a weatherised automotive subwoofer adapted for outdoor use.
• 100% UV stable ASA injection-moulded plastic parts: ASA (Acrylonitrile Styrene Acrylate) engineering thermoplastic specifically formulated to resist UV-induced colour fading, surface degradation, and structural embrittlement under the prolonged direct sun exposure common 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 directly contributing to long-term subwoofer performance and reliability in marine environments.
• 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 change compliance characteristics in humid and wet marine environments, providing superior tear and fatigue resistance compared to standard fabric spiders during high-excursion subwoofer use.
• Ultra-flexible fully insulated silicone lead wire: Maintains flexibility across the wide temperature range of Australian outdoor environments, resisting cracking and hardening over time in conditions where standard PVC insulation degrades. Extends fatigue life at high excursion.
• Proprietary corrosion-resistant spring-loaded push terminals: Fast tool-free wiring connection with corrosion resistance appropriate for saltwater and estuarine marine 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 building a sealed or ported box is impractical consistent with the RM110D2B's installation flexibility.
• Colour-matched black grille and removable trim ring: 100% UV stable colour-matched black grille provides a factory-finished appearance. The removable trim ring allows clean installation in custom flush-mount applications.
• Available in black or white: The RM110D4B is the black finish variant. A white finish version is available separately confirm part number with your supplier.

Technical Specs

Compatible With

• Rockford Fosgate PM300X1 Punch Marine 300W mono amplifier (2-ohm parallel wiring natural pairing)
• Rockford Fosgate Power Marine TM400X2ad and TM400X4ad amplifiers (2-ohm parallel wiring confirm channel power 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
• RM110D2B (dual 2-ohm variant) for 1-ohm stable amplifier pairings
• White finish variant available separately confirm part number with supplier

Frequently Asked Questions

What is the difference between the RM110D4B and RM110D2B? Both are 10" Prime marine subwoofers in black with identical construction, materials, and marine-grade compliance. The RM110D4B has dual 4-ohm coils (2-ohm parallel / 8-ohm series), while the RM110D2B has dual 2-ohm coils (1-ohm parallel / 4-ohm series). Choose the RM110D4B for 2-ohm stable amplifier pairings including the PM300X1; choose the RM110D2B for 1-ohm stable amplifiers such as the TM500X1br.

What impedance does the RM110D4B present to the amplifier? The RM110D4B has dual 4-ohm voice coils. Wired in parallel, it presents a 2-ohm load the standard configuration for pairing with 2-ohm stable mono amplifiers. Wired in series, it presents an 8-ohm load for specific configurations. Confirm your amplifier's stable impedance rating before wiring.

Can the RM110D4B be installed in infinite baffle without an enclosure? Yes. The RM110D4B is confirmed compatible with infinite baffle (free-air) installation, allowing direct mounting in vessel transom panels and powersport enclosures where a dedicated subwoofer box is impractical. Confirm the recommended free-air parameters with Rockford Fosgate documentation before installing in this configuration.

Is the RM110D4B the right choice for pairing with the PM300X1 Punch Marine amplifier? Yes. The PM300X1 delivers 300W RMS at 2 ohms the parallel wiring impedance of the RM110D4B making it the natural amplifier pairing for this subwoofer in a Punch Marine system build. Confirm the RM110D4B's power handling with your supplier to ensure the match is within the driver's rated capacity.

Is the RM110D4B available in white? The RM110D4B is the black finish variant. A white finish version is available separately confirm the part number with your supplier before ordering.