Rockford Fosgate M2D4-12S M2 Series 12" 400W RMS (1600W Peak Power Handling) 4 Ohms Dual Voice Coils Color Optix™ Sealed Enclosure Marine Subwoofer
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What's Inside?
- • 12" M2 Series Marine Subwoofer
- • Stainless steel grille
- • Sport grille (Black)
- • Grille frame (Black)
- • 11" LED power harnesses with 4-pin Deutsch connector on one end
- • (6) 3" Stainless steel Allen head screws
- • 4mm Allen head bit
- • 4.5mm Drill bit (for fiberglass enclosures only)
- • Rockford Fosgate contact information
- • Owner's Manual
Built for Salt, Sun, and Real Marine Abuse
The Rockford Fosgate M2D4-12S is designed for environments where ordinary subwoofers just do not last. It is engineered using ASTM B117 salt fog and ASTM G154 UV testing standards, so it is proven to resist corrosion, moisture, and constant sun exposure. Whether it is on a boat or an open-air marine setup, this sub is built to stay reliable and keep delivering solid bass even in tough conditions.
Serious Power With Flexible System Control
This subwoofer gives you real flexibility without overcomplicating your setup. The selectable dual impedance design lets you switch between 2 ohms and 8 ohms by wiring the dual 4 ohm voice coils in series or parallel, while still delivering strong performance at 400W RMS and 1600W peak power. It is also optimized specifically for compact sealed enclosures tuned to a 0.75 cubic foot box, giving you tight, accurate, and controlled bass that hits clean without needing a large enclosure.
Clean Bass Performance With Smart Engineering and Custom Style
The M2D4-12S combines durability, performance, and style in one clean package. The RGB lighting system behind the grille lets you customize colors like aqua, pink, yellow, or white, while the waterproof Deutsch connector keeps everything sealed and marine ready. VAST technology increases cone efficiency for stronger bass output in a compact design, and Klippel Verified engineering ensures low distortion and accurate sound reproduction. With stainless steel corrosion-resistant hardware and flexible wiring options, this subwoofer delivers tight bass, reliable performance, and a clean custom look built specifically for marine audio systems.
Frequently Asked Questions (FAQ)
- • Why Does My M2D4-12S Sound Boomy Instead of Tight?
An overly boomy response can occur when the enclosure volume, mounting location, or crossover settings do not suit the subwoofer. Verify that the sealed enclosure is close to Rockford's recommended 0.75 cu. ft. internal volume.
- • Why Is the Subwoofer Quiet Even With a Powerful Amplifier?
A high-rated amplifier does not automatically guarantee strong bass. Incorrect gain adjustment, low source signal, an unsuitable impedance setting, or poor speaker wiring can limit the actual output reaching the M2D4-12S.
- • How Do I Stop the Bass From Cancelling With My Main Speakers?
If the bass becomes thin when the main speakers are playing, phase or polarity may be reversed. Check the positive and negative speaker connections and adjust the amplifier's phase setting if available.
- • Why Does My M2D4-12S Vibrate the Surrounding Panel?
Strong low-frequency movement can expose loose panels, mounting hardware, or trim pieces that were quiet with smaller speakers. Tighten the enclosure mounting points and inspect nearby surfaces for resonance before changing the subwoofer settings.
- • What If My Amplifier Cannot Handle the Selected 2-Ohm Load?
The M2D4-12S uses a switchable impedance design, allowing 2Ω or 8Ω operation. If your amplifier is not stable at 2Ω, use the appropriate 8Ω configuration instead of forcing an unsafe load.
- • Why Does My Subwoofer Lose Output When the Boat or Vehicle Gets Moving?
Environmental noise can mask low-frequency output at speed, making the bass seem weaker than it is when stationary. Recheck the amplifier level and crossover rather than immediately increasing gain to maximum.
- • Why Is the M2D4-12S Hard to Mount in My Available Space?
The enclosure requires approximately an 11-inch cutout and 4.87-inch mounting depth. Tight installations should be measured carefully because nearby framing or wiring can interfere with the basket and terminals.
- • Why Does My Subwoofer Cut In and Out After Installation?
Intermittent bass can be caused by a loose speaker connection, poor power or ground connection, or an improperly seated marine connector. The M2D4-12S uses integrated Deutsch/Amphenol connections, so inspect the plugs and wiring carefully if the problem occurs after installation.
- • Why Won't the Color Optix Lighting Respond to My Controller?
The M2D4-12S can operate as an audio subwoofer even when its lighting system has a problem. Color Optix requires the appropriate PMX-RGB controller and RF Connect App, so verify the controller power, cable connections, and app communication separately from the audio wiring.
- • Could an Incorrect Installation Make a Good Subwoofer Appear Defective?
Yes. Rockford Fosgate notes that products returned for service can sometimes have no trouble found because of incorrect installation. Before replacing the M2D4-12S, check polarity, impedance, amplifier settings, wiring, connectors, and enclosure installation.
- Diameter : 12 Inch
- Sensitivity : 88 dB
- Impedance : 4 Ohm
- Frequency Response : 20-750 Hz
- RMS Power Range : 400 Watts
- Peak Power Handling : 1600 Watts
- Color : White
- Mounting Depth : 4.87 Inches
Features:
- Marine Environmental Validation: Engineered using ASTM B117 salt/fog and ASTM G154 UV testing standards to ensure reliable operation and resistance to corrosion, moisture, and UV exposure.
- Selectable Dual Impedance Design: Integrated switch enables easy configuration between 2Ω and 8Ω by wiring dual 4Ω voice coils in series or parallel, maintaining 400W RMS and 1600W peak power handling.
- Compact Sealed Enclosure Optimization: Specifically tuned for small sealed box applications with a recommended 0.75 ft³ enclosure volume for controlled, accurate, and impactful bass response.
- Dynamic RGB Lighting System: Built-in red, green, and blue LEDs behind the grille provide customizable lighting effects with multiple color combinations including white, aqua, yellow, and pink.
- Marine-Grade LED Connectivity: Includes a 4-pin waterproof Deutsch DT Series connector and harness for secure installation, with compatibility for external RGB lighting controllers (sold separately).
- Dual Terminal Connectivity Options: Features both standard quick-slide terminals and a sealed 2-pin Deutsch connector for flexible, corrosion-resistant wiring.
- Enhanced Cone Efficiency Technology: Utilizes VAST (Vertical Attach Surround Technique) to maximize effective cone area and improve bass output without increasing overall basket size.
- Precision Acoustic Engineering: Klippel Verified design optimizes motor structure, suspension movement, and voice coil alignment for reduced distortion and improved sound accuracy.
- Corrosion-Resistant Construction: Built with stainless steel mounting hardware designed to withstand long-term exposure to saltwater and harsh marine conditions.
- Sealed Box Performance Tuning: Optimized specifically for compact sealed enclosures, delivering tight, deep, and controlled low-frequency response ideal for marine audio systems.
Specifications:
- Size: 12"
- Nominal Impedance (Ohms): 2-Ohm or 8-Ohm Switchable
- Power Handling (Watts RMS): 400 Watts RMS/ 1,600 Watts PEAK
- Voice Coil Type: Dual Voice Coil
- Voice Coil Diameter: 1.95" (49.53 mm)
- Magnet Weight (oz): 61.09 oz. (1.7 Kg)
- Frequency Response (Hz): 20 Hz - 750 Hz
- Fs (Hz): 32
- Le (mH): 3.43
- Re (Ohms): 6.5
- Sd (cm2): 539
- Qms: 4.26
- Qes: 1.08
- Qts: 0.85
- Vas: 7
- SPL (dB @ 1w/1m): 88
- SPL (dB @ 2.8v): 89
- Xmax (mm): 15
- Speaker Connector: 2-pin Deutsch™ and 1/8" Spade
- Cutout Diameter: 11” (279.4 mm)
- Mounting Depth: 4.87" (123.8 mm)
- Sealed Box Volume (Vb): 0.75 (21 Liters)
- Woofer Displacement: 0.121 (3.43 Liters
- UPC: 780687355678
- Weight: 10
- Authorized Internet Dealer
Warranty: 2 Year(s) Warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to OnlineCarstereo.com for replacement within 2 Year(s) from the original date of purchase with proper return authorization.
