What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

Our take on the Rockford Fosgate R2D4-10

by Jo Greene

Rockford Fosgate's Prime R2 subs deliver strong bass in your car, and they are definitely built to last. The R2D4-10 sub features a 10" mica-injected polypropylene cone that works with a high-density poly-foam surround to punch out fat, deep notes. Rockford Fosgate stitches the tinsel leads that carry the signal to the voice coils directly into the cone — they'll hang tough through heavy use so you get consistent, reliable performance. The stamped solid-steel frame offers venting usually found in high-end subs that keeps this sub running cool.

Dual 4-ohm voice coils allow you to wire this sub for 2- or 8-ohm impedance, giving you more flexibility in setting up your system. Rockford Fosgate optimizes this Prime sub for both sealed and ported enclosures so you can choose the type of bass you want in your ride.

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Highlights:

10" subwoofer with dual 4-ohm voice coils
mica-injected polypropylene woofer cone with poly-foam surround
stamped solid-steel frame
power range: 50-250 watts RMS (500 watts peak power)
frequency response: 45-250
sensitivity: 87 dB
top-mount depth: 4-3/8"
sealed box volume: 0.59 cubic feet
ported box volume: 1.4 cubic feet
warranty: 1 year
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Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and specs chart | What’s in the box? | In-depth notes

Features and Specs


Size Loading...	10 -inch
Impedance Loading...	4 ohms
Cone Material Loading...	Mica injected poly
Surround Material Loading...	Poly-foam
Ideal Sealed Box Volume (cubic feet) Loading...	0.59
Ideal Ported Box Volume (cubic feet) Loading...	1.4
Port diameter (inches) Loading...	4
Port length (inches) Loading...	13
Free-Air Loading...	No
Dual Voice Coil Loading...	Yes
Sensitivity Loading...	87 dB at 1 watt
Frequency Response Loading...	45 - 250 Hz
RMS Power Range (Watts) Loading...	50-250
Peak Power Handling (Watts) Loading...	500
Top Mount Depth (inches) Loading...	4 7/16
Bottom Mount Depth (inches) Loading...	N/A
Cutout Diameter or Length (inches) Loading...	9 1/16
Vas (liters) Loading...	39
Fs (Hz) Loading...	35
Qts Loading...	0.53
Xmax (millimeters) Loading...	6.5
Parts Warranty Loading...	1 Year
Labor Warranty Loading...	1 Year

Product Research

What's in the box?

Download owner's manual

10" Dual 4-ohm voice coil subwoofer
Eight 1-1/8" Allen head screws
4mm Allen head bit
Installation/Operation manual (English/ French/ Spanish/ German)

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At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Features
Enclosure Compatibility

Features

Overview: The Rockford Fosgate Prime R2D4-10 is a 10-inch subwoofer with dual 4Ω voice coils. The sub features a StampCast steel frame, quick-release compression terminals, and a mica injected polypropylene cone. An anodized aluminum voice coil former and spider venting help keep the subwoofer cool.

Steel Basket: The R2D4-10 subwoofer features a StampCast steel basket for added rigidity.

Compression Terminals: The Prime R2D4-10 features spring post terminals which accommodate speaker wire up to 12 gauge.

CEA-2031 Compliant: Power handling on the Rockford Fosgate Prime R2D4-10 subwoofer conforms to CEA-2031 industry standards. This means the subwoofer has the capacity to handle power under continuous demand, not instantaneous power handling, that over time, can damage voice coils.

Enclosure Compatibility

Sealed Box: Rockford recommends a sealed enclosure with an optimum internal volume of 0.59 cubic feet (from 0.5 to 0.75 cubic feet is acceptable). Sealed enclosures provide the most control over a woofer, will handle a lot of power, and provide accurate sonic reproduction, making them suitable to all types of music.

Ported Box: Rockford recommends a ported enclosure with an internal volume of 1.4 cubic feet using one 4" diameter x 13" long port; this yields a tuning frequency of 43 Hz. Ported (or vented) enclosures typically provide better overall efficiency than sealed so they are suitable for use with smaller amplifiers, giving you more bass output from less power. However, this efficiency comes at the expense of very low frequency output (below 40Hz).