Rockford Fosgate M1D4-12B M1 12" DVC 4Ω Color Optix Marine Subwoofer - Black

Rockford Fosgate M1D4-12B M1 Series 12 Inch DVC 4-Ohm Color Optix Marine Subwoofer in Black

A marine grade 12 inch dual voice coil 4-ohm subwoofer in black with Color Optix RGB LED lighting, 300W RMS handling, and VersaSwitch impedance selection between 2-ohm and 8-ohm. Santoprene VAST surround, mineral-filled polypropylene cone, vented motor with nano-coated mesh screen, and integrated Deutsch/Amphenol plug-and-play connectors. Compatible with sealed (1.65 cu.ft) and vented (2.45 cu.ft) enclosures. IPX6 rated and ASTM B117 and G154 tested. Sold individually (1 each). Backed by a 2 year warranty.

Product Overview

The Rockford Fosgate M1D4-12B is an M1 series 12 inch dual voice coil (DVC) 4-ohm marine subwoofer in black, featuring Color Optix RGB LED illumination controllable via the PMX-RGB controller and RF Connect app (available on iOS and Android, sold separately). The M1 series sits between the M0 entry level and the premium M2 series, adding Color Optix lighting, Deutsch/Amphenol integrated connectors, VersaSwitch impedance selection, and ASTM and ISO-tested marine construction.

The VersaSwitch allows impedance to be changed between 2-ohm (parallel) and 8-ohm (series) by flipping a single switch, without any additional wiring. Integrated Deutsch/Amphenol connectors are moulded directly into the basket frame, providing error-proof plug-and-play connectivity for both the speaker signal and Color Optix RGB lighting. Conventional zinc nickel-plated marine grade brass spade terminals are also included as an alternative wiring option.

The cone is injection-moulded mineral-filled polypropylene with UV inhibitors, co-moulded with a Santoprene VAST surround. Rockford Fosgate's patented VAST technique increases the effective radiating cone area by up to 25%. A linear synthetic fiber blend spider provides consistent excursion control. The vented motor design with a water-repelling nano-coated mesh screen allows heat dissipation at high output levels while protecting the motor from water ingress. The 100% UV stable ASA plastic frame and grille resist discolouration in marine environments. Optically clear UV stable RGB lighting encapsulation protects the LED PCB throughout.

The M1D4-12B is compatible with both sealed (1.65 cu.ft / 46.72 litres) and vented (2.45 cu.ft / 69.38 litres) enclosure configurations. Tested to ASTM B117 (500-hour salt/fog), ASTM G154 (500-hour accelerated UV), and ISO60068-2-64 vibration standards. Klippel Verified certification applied. Sold individually - one subwoofer per purchase.

---

Features & Benefits

VersaSwitch - 2-Ohm or 8-Ohm Without Rewiring: The VersaSwitch allows the DVC 4-ohm voice coils to be configured to parallel (2-ohm) or series (8-ohm) by flipping a single switch, enabling flexible amplifier matching without additional wiring or soldering.

Color Optix RGB LED Lighting - App Controlled: Ultra-bright wide-angle RGB LEDs are protected by optically clear UV stable encapsulation, controllable via the PMX-RGB controller and RF Connect app on iOS and Android. The PMX-RGB controller is sold separately.

Integrated Deutsch/Amphenol Connectors - True Marine Ecosystem: Moulded in-frame Deutsch/Amphenol connectors combine speaker signal and Color Optix RGB lighting into a single error-proof plug-and-play connection. Zinc nickel-plated marine grade brass spade terminals are also included for standard wiring installations.

Santoprene VAST Surround - UV and Salt-Fog Resistant: The Santoprene VAST surround is co-moulded to the mineral-filled polypropylene cone and attaches vertically using Rockford Fosgate's patented VAST technique, increasing the effective radiating cone area by up to 25% for more bass output from the same 12 inch driver.

Vented Motor with Nano-Coated Water-Repelling Mesh Screen: The vented motor design allows heat to dissipate from the 2 inch (50mm) Kapton voice coil former at high output levels, while the nano-coated mesh screen prevents water from entering the motor assembly in spray-intensive marine environments.

Sealed and Vented Enclosure Compatible: The M1D4-12B supports both sealed (1.65 cu.ft) and vented (2.45 cu.ft) enclosure configurations, giving installers the flexibility to match the subwoofer to the available space and desired bass response characteristic.

ASTM and ISO Tested - Purpose-Built Marine Construction: Tested to ASTM B117 (500-hour salt/fog), ASTM G154 (500-hour accelerated UV), and ISO60068-2-64 vibration standards. IPX6 water intrusion rating confirms protection against powerful jets of water from any direction.

---

Technical Specs

---

Compatible With / Goes Well With

The M1D4-12B is suited to marine watercraft, pontoon boats, ski boats, and any vessel requiring a 12 inch marine subwoofer with Color Optix lighting. Compatible with sealed (1.65 cu.ft) and vented (2.45 cu.ft) enclosures. The VersaSwitch enables pairing with amplifiers rated at 2-ohm or 8-ohm. Sold individually - two units are required for a stereo or dual subwoofer installation.

Goes Well With:

• PMX-RGB - Rockford Fosgate Color Optix RGB controller required to access full Color Optix lighting control and RF Connect app integration
• M5-1000X1 - M5 series 1000W marine monoblock amplifier, compatible with the M1D4-12B at both 2-ohm and 8-ohm VersaSwitch settings
• M2-500X1 - M2 series 500W mono marine amplifier for a matched M2 ecosystem pairing at 2-ohm or 8-ohm
• M5-1500X5 - M5 series 1500W 5-channel marine amplifier for full system builds pairing the M1D4-12B with marine full-range speakers
• M1D4-12 - White version of this subwoofer for colour-matched installations
• M2D4-12I - M2 series premium 12 inch Color Optix infinite baffle subwoofer for comparison

---

Frequently Asked Questions

What impedance settings does the VersaSwitch provide on the M1D4-12B?

The M1D4-12B uses DVC 4-ohm voice coils. The VersaSwitch configures the coils to parallel (2-ohm total) or series (8-ohm total) without any rewiring. Use the 2-ohm setting when pairing with an amplifier rated for lower impedance loads for maximum output, or the 8-ohm setting for amplifiers better suited to a higher impedance. Contact us if you need help selecting the correct setting for your amplifier.

What enclosure types are compatible with the M1D4-12B?

The M1D4-12B is compatible with both sealed (1.65 cu.ft / 46.72 litres) and vented (2.45 cu.ft / 69.38 litres) enclosure configurations. A sealed enclosure delivers tighter, more accurate bass with a shallower roll-off, while a vented enclosure produces more output at the tuning frequency with a steeper low-frequency roll-off below the port tuning point. Choose based on your installation space and preferred bass character.

What is the difference between the M1D4-12B and the M2D4-12I?

The M1D4-12B is the M1 series 12 inch DVC 4-ohm subwoofer in black, compatible with sealed and vented enclosures, using a Santoprene VAST surround and linear synthetic fiber blend spider. The M2D4-12I is the premium M2 series 12 inch DVC 4-ohm infinite baffle subwoofer, optimised for free-air hull mounting without an enclosure, featuring ASTM-tested construction and industry-first moulded in-frame connectors. The VersaSwitch settings also differ: M1D4-12B switches between 2-ohm and 8-ohm, while M2D4-12I switches between 2-ohm and 8-ohm as well. Choose the M1D4-12B for sealed or vented enclosure builds; choose the M2D4-12I for infinite baffle installations where no enclosure is available.

Is the M1D4-12B sold as a single unit or as a pair?

The M1D4-12B is sold individually - one subwoofer per purchase. If your installation requires two subwoofers, two units will need to be added to the order.

Does the Color Optix lighting require a separate controller?

Yes. Color Optix RGB lighting requires the PMX-RGB controller and the RF Connect app (available on iOS and Android) to access full colour control, lighting effects, and brightness adjustment. The PMX-RGB controller is sold separately. The subwoofer can also be used without the controller at a fixed default colour setting straight out of the box.