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Rockford Fosgate M210S4B (Black)

10" 4 ohm Marine M2 Series Subwoofer


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Rockford Fosgate PM210S4B

OUR PRICE: $249.99

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The RF Marine M2 full-range are perfect for anyone looking to add some real power to their vessel. UV and moisture resistants assure great performance in even the harshest of marine environments.

  • 10" Rockford Fosgate Marine M2 Series Subwoofer
  • Power Handling:
    • Peak: 500 watts
    • RMS: 250 watts
  • Impedance: 4 ohm
  • Injection molded mineral filled parabolic polypropylene cone
  • UV and Salt-Fog resistant TPE (Thermo-Plastic Elastomer) surround
  • High temperature KaptonŽ former with polyimide insulated copper wire
  • Internal magnetic shielding for reduced electromagnetic interference potential
  • 2" Voice coil
  • Linear, high excursion matched motor magnetics and suspension design
  • Frequency response: 40-250 Hz
  • Sensitivity: 86 dB
  • Color is black
  • Also available in: White
  • 1-year warranty

Product History:

Rockford Fosgate PM210S4B thumbnail
(newest, current model)
Rockford Fosgate M210S4B thumbnail
(previous model, replaced by Rockford Fosgate PM210S4B)

Subwoofer Specifications

Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

Round / Circle
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
500 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
250 watts
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Thermo-Plastic Elastomer
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Minimum Sealed Box Volume
This value indicates the minimum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
0.75 cubic feet
Maximum Sealed Box Volume
This value indicates the maximum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
0.75 cubic feet
Minimum Ported Box Volume
This value indicates the minimum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.25 cubic feet
Maximum Ported Box Volume
This value indicates the maximum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.25 cubic feet
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
86 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
40 - 250 Hz
Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
10 mm
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

Cutout Diameter
The actual diameter of the hole you will need to cut out if you are creating a new mounting location for this speaker, or if you are mounting a subwoofer in a box.
Recommended Enclosure Type
This is the recommended type of enclosure that the subwoofer should be installed into. Some subwoofers are specially designed for particular enclosures.

Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.

Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".

Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.

Ported / Vented
Subwoofer Grille
Most subwoofers are able to accommodate a universal grille; however, some subs include a grille and others have a specific, optional grille available for purchase separately. If "yes", then the subwoofer includes a grille. If "optional (sold separately)" the matching grille will need to be purchased in addition to the sub.
Yes - Included
Re-Cone Kit Available
Some higher end subwoofers have replaceable cone assemblies. In case of a blown woofer, a recone kit allows for a simple replacement, as opposed to purchasing an entire new subwoofer.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Atchison, KS

Excellent sound

July 26, 2013

I love the look of this product the grill looks amazing in my boat!!! The sound they produce is awesome for the price!!!! I have the whole Rockford Fosgate system in my boat!!!! Awesome!!!

17 of 29 found this helpful

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Austin, TX


August 28, 2012

I purchased these subs from Sonic and couldn't be more pleased!! These subs FAR exceeded my expectations!! Sonic offered these at an unbelievable price! Thanks Sonic and Rockford for ROCKING MY BOAT THIS SUMMER!!!

19 of 36 found this helpful

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Party on the Lake!

SLC, Utah


August 14, 2014

The Rockford Fosgate M210S4 10" sub looks amazing installed. A cut out stencil would have been helpful since it was a new installation but the measurement specs were included. I have this single 10 inch connected to a high quality amp's bridged channel with 200 watts RMS output at 4 ohms, with dedicated low frequency inputs. The infinite baffle sound is very comfortable for everyone in the boat, not too thundery or anemically mellow. I did get a hint of vibration when the sound is way, way up during a song with huge synthesized base, so I'm not sure if that was because the cone action was actually able to hit the cover, or if amp's input sensitivity was a little too high causing a clip, or if the sound output was just rattling something else nearby. Regardless, it was minor and will be adjusted so am very pleased with this purchase. I also appreciate Sonic's pricing, shipping and warranty.

18 of 36 found this helpful

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Phoenix, AZ

Marine Subs that Sound Great

September 17, 2013

Definitely built to withstand the marine environment and they produce that great Fosgate bass sound. Rated at 250 watts each RMS, I have two wired in parallel and crossed over at 90 HZ. They will go down to around 40 HZ in a small box. The stainless steel grills are thick and kick proof. The speakers also have a built in cover to protect them from water and sun. The speaker grills including the outer rings are larger then normal so be sure to measure and factor the grills in.

8 of 16 found this helpful

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San Diego, CA

Awesome sub and a great price

May 23, 2010

Great sub for a boat or if you're just looking for a quality durable sub. Looks sweet too!

12 of 24 found this helpful

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Boat guy


Great speakers

June 15, 2014

Put 4 of these speakers on my boat. Hooked a 400 watt amp up. Have loss of hearing now! Great speakers! Great price!

14 of 33 found this helpful

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Items we think you might want
M210S4 main
Rockford Fosgate M210S4 (White)

• 500W Peak
• 250W RMS
• 4 ohm
• polypropylene cone
• Thermo-Plastic Elastomer Surround
• KaptonŽ Former
• Magnetic Shielding
• White

Your Price $249.99

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Product Summary


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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Rockford Fosgate M210S4B (Black)