M212S4B 12" Marine Subwoofer - Black

The M212S4B is a black 12” subwoofer designed for marine watercraft or powersports applications. It features a stainless steel grille is UV and moisture resistant and can be used in sealed, vented or infinite baffle installations.

  • True Marine Grade compliance
  • UV stable Centrex® injection molded plastic parts
  • Proprietary corrosion resistant gold plated bare-wire input push-type terminals
  • Injection molded mineral filled parabolic polypropylene cone body with UV inhibitors
  • UV and Salt-Fog resistant TPE (Thermo-Plastic Elastomer) surround
  • 16 gauge corrosion resistant removable Stainless Steel grille cover insert
  • Internal magnetic shielding for reduced electromagnetic interference potential
  • Fully insulated ultra-flexible lead wire
  • High temperature Kapton® former with polyimide insulated copper wire
  • Moisture, tear and fatigue resistant aramid fiber spider
  • Linear, high excursion matched motor magnetics and suspension design
  • Removable trim ring
ASTM Test Standards
VAST Surround - Marine
Flex Fit Basket - Marine

M212S4B

Rockford Fosgate's M2 marine grade standard takes into account the devastating effects of the outdoor environment and takes extreme measures to ensure optimum performance.

Just because you're on the water doesn't mean you have to go without bass. Put this 12" in your boat and you just may redefine "party barge!" This subwoofer is designed for free air/infinite baffle applications.


Updated: 12/15/2014
CEA-2031

CEA-2031

Power handling on Rockford Fosgate speakers conform to CEA-2031 industry standards.
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ASTM Test Standards

ASTM Test Standards

Marine Grade standards ensure resistance to extreme environments.
Learn more
VAST Surround - Marine

VAST Surround - Marine

The Vertical Attach Surround Technique significantly increases a subwoofer's effective radiating...
Learn more
Flex Fit Basket - Marine

Flex Fit Basket - Marine

The slot mounted frame pattern allows fine-tuning of the marine speaker's mounting position.
Learn more
CEA-2031 Compliant: CEA-2031 Guidelines
Size: 12"
Nominal Impedance: 4-Ohm
Power Handling (Watts RMS): 300 Watts RMS
600 Watts Max
Voice Coil Diameter: 1.95" (49.53 mm)
Magnet Weight (oz): 93.6 oz. (2.65 kg.)
Speaker Connector: Corrossion resistant 8 AWG spring load
Fs (Hz): 35
Re (Ohms): 3.10
Le (mH): 0.3
Qms: 9.00
Qes: 0.55
Qts: 0.52
Vas (Liters): 44.3
Sd (cm2): 510
SPL (dB @ 1w/1m): 87
Xmax (mm): 12.0
Woofer Displacement (in): 0.053 cu.ft. (1.50 Liters)
Cutout Diameter (in): 10.95 in. (27.82 cm)
Mounting Depth (in): 6.58 in. (16.72 cm)
Shipping Weight: 20.1 Lbs. (9.15 Kg.)

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Return Authorization

Contact the Authorized Rockford Fosgate Dealer you purchased this product from. If you need further assistance, call 1-800-669-9899 for Rockford Customer Service. You must obtain an RA# (Return Authorization number) to return any product to Rockford Fosgate. You are responsible for shipment of product to Rockford.

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EBP
Amp Power Range
Sealed Recommended Design
This is the optimum recommended sealed woofer enclosure and replicates the optimum enclosure listed in the owner's manual. You may notice slight differences between online information and the owner's manual due to continual improvement on usage of our products.
M210S4_M212S4_sealed.gif
  • All sides use 3/4" (18mm) thick MDF.
  • All box dimensions are external.
  • Dimensions above include Vb + woofer displacement.
    Standard Metric
Vb 1.00 cu. ft. 28.32 Liters
F3 53.70 Hz  
Qtc 0.82  
Height 15.50 in. 39.37 cm
Width 17.63 in. 44.77 cm
Depth 12.00 in. 30.48 cm
Spk. Cutout 0.000 in. 0.000 cm
Spk. Depth 6.58 in. 16.71 cm
Vd 0.000 cu. ft. 0.000 Liters
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Vented Recommended Design
This is the optimum recommended vented woofer enclosure and replicates the optimum enclosure listed in the owner's manual. You may notice slight differences between online information and the owner's manual due to continual improvement on usage of our products.
M210S4_M212S4_vented.gif
  • All sides use 3/4" (18mm) thick MDF.
  • All box dimensions are external.
  • Dimensions above include Vb + woofer/port displacement.
  • Port diagram for reference only and may require alternate placement.
  • An infrasonic filter is required for reliable performance in vented designs.
    Standard Metric
Vb 1.50 cu. ft. 42.48 Liters
F3 37.20 Hz  
Fb 40.00 Hz  
Height 15.50 in. 39.37 cm
Width 20.25 in. 51.44 cm
Depth 12.50 in. 31.75 cm
Np 1 port  
Dp 3.00 in. diameter 7.62 cm diameter
Lp 5.74 in. long 14.58 cm long
Spk. Cutout 0.000 in. 0.000 cm
Spk. Depth 6.58 in. 16.71 cm
Vd 0.000 cu. ft. 0.000 Liters
Vp 0.023 cu. ft. 0.665 Liters
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Infinite Baffle Design
An Infinite Baffle represents an application where the compliance of the air volume within the enclosure is greater than the compliance on the speaker's suspension (Vas).
An infrasonic filter is required for reliable performance in IB designs.
M210S4_M212S4_ib.gif
  • Baffle board uses 3/4" (18mm) thick MDF.
  • Baffle board & cavity air leaks can cause significant performance loss.
  • For optimum results, ensure cavity & baffle board are air tight.
  • An infrasonic filter is required for reliable performance in IB designs.
    Standard Metric
Fc 50.10 Hz  
F3 50.50 Hz  
Qtc 0.58  
Spk. Cutout 0.00 in. 0.00 cm
Spk. Depth 6.58 in. 16.71 cm
Vd 0.00 cu. ft. 0.00 Liters
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