Description
Rockford Fosgate M210S4B Marine Grade 10 Inch 4-Ohm Subwoofer in Black
A marine grade 10 inch 4-ohm subwoofer delivering 250W RMS and 500W peak power, purpose-built for boat, watercraft, and powersports applications. UV and salt-fog resistant construction throughout. Compatible with sealed, vented, or infinite baffle installations. Backed by a 1 year warranty.
Product Overview
The Rockford Fosgate M210S4B is a True Marine Grade 10 inch 4-ohm subwoofer in black, engineered for demanding marine and powersports environments. Built to withstand the devastating effects of moisture, UV radiation, salt fog, and temperature extremes, the M210S4B carries full ASTM test standard compliance and CEA-2031 certified power handling.
The injection molded mineral-filled parabolic polypropylene cone body features UV inhibitors, and the surround is constructed from UV and salt-fog resistant TPE (Thermo-Plastic Elastomer). The aramid fiber spider is moisture, tear, and fatigue resistant. A 16 gauge corrosion-resistant removable stainless steel grille cover insert and proprietary corrosion-resistant gold-plated bare-wire push-type input terminals complete the marine-grade build. The FlexFit basket allows fine-tuning of the subwoofer mounting position via slot-mounted frame pattern. Compatible with sealed, vented, or infinite baffle installations. The white version of this subwoofer is available as the M210S4.
Features & Benefits
True Marine Grade Construction – ASTM Tested: The M210S4B meets True Marine Grade compliance standards, tested to ASTM specifications for resistance to UV radiation, moisture, salt fog, and extreme temperatures. Every material and component is chosen for long-term outdoor performance.
UV and Salt-Fog Resistant TPE Surround: The TPE (Thermo-Plastic Elastomer) surround is engineered specifically to resist UV degradation and salt-fog corrosion, maintaining flexibility and performance in harsh marine conditions over the long term.
Aramid Fiber Spider – Moisture, Tear and Fatigue Resistant: The aramid fiber spider provides exceptional resistance to moisture absorption, tearing, and fatigue, ensuring consistent linear excursion and long-term reliability in wet environments.
Linear High Excursion Motor Design: Matched motor magnetics and suspension design deliver linear, high excursion movement with 10mm Xmax, keeping bass output clean and controlled at higher volume levels.
FlexFit Basket for Precise Mounting: The slot-mounted frame pattern allows fine-tuning of the subwoofer’s mounting position during installation, giving installers the flexibility to achieve optimal fit in a range of enclosure configurations.
Corrosion-Resistant Stainless Steel Grille and Gold-Plated Terminals: The removable 16 gauge stainless steel grille cover insert and proprietary gold-plated bare-wire push-type input terminals resist corrosion throughout the service life of the subwoofer.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | M210S4B |
| Size | 10 inch |
| Colour | Black |
| Nominal Impedance | 4-Ohm |
| Power Handling | 250W RMS / 500W Max |
| SPL | 86 dB (1W/1m) |
| Fs (Hz) | 45 |
| Vas (Litres) | 20.2 |
| Qts | 0.57 |
| Qes | 0.64 |
| Qms | 9.00 |
| Xmax | 10.0mm |
| Re (Ohms) | 3.6 |
| Le (mH) | 0.3 |
| Sd (cm2) | 346 |
| Woofer Displacement | 0.154 cu.ft. (4.35 Litres) |
| Voice Coil Diameter | 1.95 inch (49.53mm) |
| Cutout Diameter | 9.00 inch (22.82cm) |
| Mounting Depth | 5.54 inch (14.07cm) |
| Magnet Weight | 54.4 oz (1.54kg) |
| Speaker Connector | Corrosion Resistant 8 AWG Spring Load |
| Compatible Enclosures | Sealed, Vented, Infinite Baffle |
| CEA-2031 Compliant | Yes |
| ASTM Tested | Yes |
| Shipping Weight | 6.5kg |
| Warranty | 1 Year |
Compatible With / Goes Well With
The M210S4B is suited to marine watercraft, pontoon boats, ski boats, wakeboard boats, and powersports applications requiring a compact 10 inch subwoofer. Compatible with sealed, vented, or infinite baffle enclosure configurations. The white version of this subwoofer is available as the M210S4 for applications requiring colour-matched white hardware.
Goes Well With:
- M5-1000X1 – Rockford Fosgate M5 series 1000W marine monoblock amplifier for maximum output with the M210S4B
- M5-800X4 – M5 series 800W 4-channel marine amplifier for full system builds pairing the M210S4B with marine full-range speakers
- M210S4 – White version of this subwoofer for applications requiring a white finish
- M2WL-8 / M2WL-8B – Rockford Fosgate M2 series 8 inch marine wakeboard tower speakers to complement the M210S4B in a full marine audio system
Frequently Asked Questions
What enclosure types are compatible with the M210S4B?
The M210S4B is compatible with sealed, vented, and infinite baffle (free air) enclosure installations. For infinite baffle applications, the subwoofer can be mounted directly into a boat hull panel or similar structure without a dedicated enclosure box, making it well suited to installations where space is limited.
What amplifier power does the M210S4B require?
The M210S4B handles 250W RMS at 4 ohms. For best performance, pair it with a monoblock or multichannel marine-grade amplifier rated between 125W and 250W RMS at 4 ohms. The Rockford Fosgate M5-1000X1 marine monoblock amplifier is a recommended pairing for maximum output.
What is the difference between the M210S4B and the M212S4?
The M210S4B is a 10 inch subwoofer in black handling 250W RMS, while the M212S4 is a 12 inch subwoofer in white handling 300W RMS. The 12 inch unit delivers greater bass extension and output capability, while the 10 inch is the better choice where enclosure space is more limited or a smaller footprint is preferred. Both share the same True Marine Grade construction and ASTM-tested materials.
Is the M210S4B suitable for saltwater marine environments?
Yes. The M210S4B is built to True Marine Grade compliance standards, with UV and salt-fog resistant TPE surround, a corrosion-resistant stainless steel grille, gold-plated input terminals, and ASTM-tested materials throughout. It is designed for both freshwater and saltwater marine environments.
Does the M210S4B come in a white version?
Yes. The white version of this subwoofer is available as the M210S4, sharing the same specifications and True Marine Grade construction. Contact us or refer to the M210S4 product page for more details.
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