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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.
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.
Series
Many brands group their products into series or lines of products to help customers know the level of quality (good, better, best for example). You can filter by series and the brand using our guided browsing.
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
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.
Top-Mount Depth (Mounting 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.
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.
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.

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.
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.
Sensitivity
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".
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
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.

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.
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Alpine S2-W8D4

900W Peak (300W RMS) 8" S-Series Dual 4-ohm Car Subwoofer

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Alpine S2-W8D4

900W Peak (300W RMS) 8" S-Series Dual 4-ohm Car Subwoofer

• Peak Power: 900 watts
• RMS Power: 300 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Polypropylene Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 3.71"
• Sensitivity: 82.7 dB

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Alpine Status HDZ-W10

2400W Peak (800W RMS) 10" Status Series Dual 4-ohm Car Subwoofer

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Alpine Status HDZ-W10

2400W Peak (800W RMS) 10" Status Series Dual 4-ohm Car Subwoofer

• Peak Power: 2400 watts
• RMS Power: 800 watts
• Impedance: Dual 4 ohm
• Pulp/Mica Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 7-7/16"
• Sensitivity: 82.2 dB

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List price $1080.00
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Alpine S2-W10D2

1800W Peak (600W RMS) 10" S-Series Dual 2-ohm Car Subwoofer

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Alpine S2-W10D2

1800W Peak (600W RMS) 10" S-Series Dual 2-ohm Car Subwoofer

• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Carbon Fiber Polypropylene Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.54"
• Sensitivity: 84.7 dB

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List price $290.00
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Alpine R2-W12D4 2nd Gen (Pair, Two Subwoofers)

2250W Peak (750W RMS) 12" 750W R-Series Dual 4-Ohm Car Subwoofers

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Alpine R2-W12D4 2nd Gen (Pair, Two Subwoofers)

2250W Peak (750W RMS) 12" 750W R-Series Dual 4-Ohm Car Subwoofers

• Includes Two Subwoofers
• Peak Power: 2250 watts
• RMS Power: 750 watts
• Impedance: Dual 4 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (H.A.M.R) Surround
• Mount depth: 6.43"
• Sensitivity: 84.6 dB

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List price $1080.00
-37% $683.90

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• Includes Two Subwoofers
• Peak Power: 2250 watts
• RMS Power: 750 watts
• Impedance: Dual 4 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (H.A.M.R) Surround
• Mount depth: 6.43"
• Sensitivity: 84.6 dB

Lowest price in 30 days

Alpine S2-W12D4 - Pair

1800W Peak (600W RMS) 12" S-Series Dual 4-ohm Car Subwoofer

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Alpine S2-W12D4 - Pair

1800W Peak (600W RMS) 12" S-Series Dual 4-ohm Car Subwoofer

• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Polypropylene Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.89"
• Sensitivity: 86.2 dB

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List price $640.00
-33% $431.90

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• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Polypropylene Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.89"
• Sensitivity: 86.2 dB

Alpine W12S4 BassLine (Pair)

Two 750W Max (250W RMS) 12" BassLine Series Single 4 ohm Car Subwoofers

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Alpine W12S4 BassLine (Pair)

Two 750W Max (250W RMS) 12" BassLine Series Single 4 ohm Car Subwoofers

• 1500W Max
• 500W RMS
• Polypropylene-Mica cone
• High-excursion poly-foam surround
• High-strength custom steel frame
• Progressive Wavelit Ribs (P.W.R.) cone design

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List price $280.00
-19% $227.90

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• 1500W Max
• 500W RMS
• Polypropylene-Mica cone
• High-excursion poly-foam surround
• High-strength custom steel frame
• Progressive Wavelit Ribs (P.W.R.) cone design

Lowest price in 30 days

Alpine S2-W10D4 - Pair

1800W Peak (600W RMS) 10" S-Series Dual 4-ohm Car Subwoofer

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Alpine S2-W10D4 - Pair

1800W Peak (600W RMS) 10" S-Series Dual 4-ohm Car Subwoofer

• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Polypropylene Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.54"
• Sensitivity: 84.9 dB

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List price $580.00
-34% $383.90

In stock

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• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Polypropylene Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.54"
• Sensitivity: 84.9 dB

Lowest price in 30 days

Alpine S2-W10D2 - Pair

1800W Peak (600W RMS) 10" S-Series Dual 2-ohm Car Subwoofer

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Alpine S2-W10D2 - Pair

1800W Peak (600W RMS) 10" S-Series Dual 2-ohm Car Subwoofer

• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Carbon Fiber Polypropylene Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.54"
• Sensitivity: 84.7 dB

Save 15% Off Package Deals at Checkout!
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List price $580.00
-34% $383.90

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Only 1 Left!

Add to Cart

• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Carbon Fiber Polypropylene Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.54"
• Sensitivity: 84.7 dB

Lowest price in 30 days

Alpine R2-W12D2 - Pair

2250W Peak (750W RMS) 12" R2-Series Dual 2-ohm Car Subwoofer

R2W12D2_2 big
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Alpine R2-W12D2 - Pair

2250W Peak (750W RMS) 12" R2-Series Dual 2-ohm Car Subwoofer

• Peak Power: 2250 watts
• RMS Power: 750 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 6.43"
• Sensitivity: 85 dB

Save 15% Off Package Deals at Checkout!
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6
List price $1080.00
-33% $719.90

In stock

Add to Cart

• Peak Power: 2250 watts
• RMS Power: 750 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 6.43"
• Sensitivity: 85 dB

Alpine SWT-10S4 - Pair

1000W Peak (350W RMS) 10" SWT Series Single 4-ohm Shallow Car Subwoofer

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Alpine SWT-10S4 - Pair

1000W Peak (350W RMS) 10" SWT Series Single 4-ohm Shallow Car Subwoofer

• Peak Power: 1000 watts
• RMS Power: 350 watts
• Impedance: Single 4 ohm
• Kevlar Reinforced Pulp Paper Cone
• Polyurethane Surround
• Mount depth: 4-3/16"
• Sensitivity: 85.1 dB

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List price $600.00
-21% $474.90

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Only 3 Left!

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• Peak Power: 1000 watts
• RMS Power: 350 watts
• Impedance: Single 4 ohm
• Kevlar Reinforced Pulp Paper Cone
• Polyurethane Surround
• Mount depth: 4-3/16"
• Sensitivity: 85.1 dB

Lowest price in 30 days

Alpine R2-W8D2 - Pair

1000W Peak (350W RMS) 8" R2-Series Dual 2-ohm Car Subwoofer

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Alpine R2-W8D2 - Pair

1000W Peak (350W RMS) 8" R2-Series Dual 2-ohm Car Subwoofer

• Peak Power: 1000 watts
• RMS Power: 350 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.56"
• Sensitivity: 83.6 dB

Save 15% Off Package Deals at Checkout!
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List price $720.00
-33% $479.90

In stock

Only 2 Left!

Add to Cart

• Peak Power: 1000 watts
• RMS Power: 350 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.56"
• Sensitivity: 83.6 dB

Alpine RS-W10D4 - Pair

1800W Peak (600W RMS) 10” R-Series Dual 4-ohm Shallow Car Subwoofer

RSW10D4_2 big
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Alpine RS-W10D4 - Pair

1800W Peak (600W RMS) 10” R-Series Dual 4-ohm Shallow Car Subwoofer

• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Polypropylene Cone
• Butyl Rubber Surround
• Mount depth: 3.19"
• Sensitivity: 78 dB

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List price $1680.00
-17% $1,399.90

In stock

Only 1 Left!

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• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Polypropylene Cone
• Butyl Rubber Surround
• Mount depth: 3.19"
• Sensitivity: 78 dB

Lowest price in 30 days

Alpine S2-W8D4 - Pair

900W Peak (300W RMS) 8" S-Series Dual 4-ohm Car Subwoofer

S2W8D4_2 big
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Alpine S2-W8D4 - Pair

900W Peak (300W RMS) 8" S-Series Dual 4-ohm Car Subwoofer

• Peak Power: 900 watts
• RMS Power: 300 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Polypropylene Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 3.71"
• Sensitivity: 82.7 dB

Save 15% Off Package Deals at Checkout!
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1
List price $500.00
-33% $335.90

In stock

Add to Cart

• Peak Power: 900 watts
• RMS Power: 300 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Polypropylene Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 3.71"
• Sensitivity: 82.7 dB

Lowest price in 30 days

Alpine Status HDZ-W12 - Pair

2400W Peak (800W RMS) 12" Status Series Dual 4-ohm Car Subwoofer

HDZW12_2 big
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Alpine Status HDZ-W12 - Pair

2400W Peak (800W RMS) 12" Status Series Dual 4-ohm Car Subwoofer

• Peak Power: 2400 watts
• RMS Power: 800 watts
• Impedance: Dual 4 ohm
• Pulp/Mica Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 7-3/8"
• Sensitivity: 83.7 dB

Save 15% Off Package Deals at Checkout!
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List price $2400.00
-33% $1,599.90

In stock

Only 1 Left!

Add to Cart

• Peak Power: 2400 watts
• RMS Power: 800 watts
• Impedance: Dual 4 ohm
• Pulp/Mica Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 7-3/8"
• Sensitivity: 83.7 dB

Alpine SWT-10S2 - Pair

1000W Peak (350W RMS) 10" SWT Series Single 2-ohm Shallow Car Subwoofer

SWT10S2_2 big
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Alpine SWT-10S2 - Pair

1000W Peak (350W RMS) 10" SWT Series Single 2-ohm Shallow Car Subwoofer

• Peak Power: 1000 watts
• RMS Power: 350 watts
• Impedance: Single 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• Polyurethane Surround
• Mount depth: 4-3/16"
• Sensitivity: 84.8 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
List price $600.00
-17% $499.90

In stock

Only 2 Left!

Add to Cart

• Peak Power: 1000 watts
• RMS Power: 350 watts
• Impedance: Single 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• Polyurethane Surround
• Mount depth: 4-3/16"
• Sensitivity: 84.8 dB

Lowest price in 30 days

Alpine R2-W10D2 - Pair

2250W Peak (750W RMS) 10" R2-Series Dual 2-ohm Car Subwoofer

R2W10D2_2 big
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Alpine R2-W10D2 - Pair

2250W Peak (750W RMS) 10" R2-Series Dual 2-ohm Car Subwoofer

• Peak Power: 2250 watts
• RMS Power: 750 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 5.92"
• Sensitivity: 82.3 dB

Save 15% Off Package Deals at Checkout!
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List price $960.00
-33% $639.90

In stock

Only 1 Left!

Add to Cart

• Peak Power: 2250 watts
• RMS Power: 750 watts
• Impedance: Dual 2 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 5.92"
• Sensitivity: 82.3 dB

Lowest price in 30 days

Alpine R2-W8D4 - Pair

1000W Peak (350W RMS) 8" R2-Series Dual 4-ohm Car Subwoofer

R2W8D4_2 big
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Alpine R2-W8D4 - Pair

1000W Peak (350W RMS) 8" R2-Series Dual 4-ohm Car Subwoofer

• Peak Power: 1000 watts
• RMS Power: 350 watts
• Impedance: Dual 4 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.56"
• Sensitivity: 83.7 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
List price $720.00
-33% $479.90

In stock

Only 2 Left!

Add to Cart

• Peak Power: 1000 watts
• RMS Power: 350 watts
• Impedance: Dual 4 ohm
• Kevlar Reinforced Pulp Paper Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 4.56"
• Sensitivity: 83.7 dB

Alpine RS-W12D2 - Pair

1800W Peak (600W RMS) 12” R-Series Dual 2-ohm Shallow Car Subwoofer

RSW12D2_2 big
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Alpine RS-W12D2 - Pair

1800W Peak (600W RMS) 12” R-Series Dual 2-ohm Shallow Car Subwoofer

• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Polypropylene Cone
• Butyl Rubber Surround
• Mount depth: 3.22"
• Sensitivity: 82 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
3
List price $1920.00
-17% $1,599.90

In stock

Only 3 Left!

Add to Cart

• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Polypropylene Cone
• Butyl Rubber Surround
• Mount depth: 3.22"
• Sensitivity: 82 dB

Lowest price in 30 days

Alpine Status HDZ-W10 - Pair

2400W Peak (800W RMS) 10" Status Series Dual 4-ohm Car Subwoofer

HDZW10_2 big
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Alpine Status HDZ-W10 - Pair

2400W Peak (800W RMS) 10" Status Series Dual 4-ohm Car Subwoofer

• Peak Power: 2400 watts
• RMS Power: 800 watts
• Impedance: Dual 4 ohm
• Pulp/Mica Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 7-7/16"
• Sensitivity: 82.2 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
List price $2160.00
-33% $1,439.90

In stock

Only 2 Left!

Add to Cart

• Peak Power: 2400 watts
• RMS Power: 800 watts
• Impedance: Dual 4 ohm
• Pulp/Mica Cone
• High-Amplitude Multi-Roll (HAMR) Surround
• Mount depth: 7-7/16"
• Sensitivity: 82.2 dB

Alpine RS-W12D4 - Pair

1800W Peak (600W RMS) 12” R-Series Dual 4-ohm Shallow Car Subwoofer

RSW12D4_2 big
Go to item page Right Arrow Icon of Right Arrow

Alpine RS-W12D4 - Pair

1800W Peak (600W RMS) 12” R-Series Dual 4-ohm Shallow Car Subwoofer

• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Polypropylene Cone
• Butyl Rubber Surround
• Mount depth: 3.22"
• Sensitivity: 81 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
1
List price $1920.00
-17% $1,599.90

In stock

Only 3 Left!

Add to Cart

• Peak Power: 1800 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Polypropylene Cone
• Butyl Rubber Surround
• Mount depth: 3.22"
• Sensitivity: 81 dB

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    • Owner's manual
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    • Vehicle produced after 2005: Inside driver's side door
    • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

    • You see only parts engineered for your exact vehicle
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.

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