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1981 Ford Thunderbird

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Universal subwoofers that fit most vehicles, including your 1981 Thunderbird.

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Universal Subwoofers for 1981 Ford Thunderbird


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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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Diamond Audio DES84 (Open Box, Great)

500W Peak (250W RMS) 8" DES Series Dual 4-ohm Car Subwoofer

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Diamond Audio DES84 (Open Box, Great)

500W Peak (250W RMS) 8" DES Series Dual 4-ohm Car Subwoofer

• Peak Power: 500 watts
• RMS Power: 250 watts
• Fiber-Reinforced High Strength Paper Cone
• Impedance: Dual 4 ohm
• Sensitivity: 82.1 dB

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$239.99
$215.99 with coupon | Price details

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• Peak Power: 500 watts
• RMS Power: 250 watts
• Fiber-Reinforced High Strength Paper Cone
• Impedance: Dual 4 ohm
• Sensitivity: 82.1 dB

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Sundown Audio SML-8 D4 8" (SML8D4) (Open Box, Great)

800W Peak (400W RMS) 8" SML Series Dual 4-ohm Shallow Car Subwoofer (SW-SML8D4)

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Sundown Audio SML-8 D4 8" (SML8D4) (Open Box, Great)

800W Peak (400W RMS) 8" SML Series Dual 4-ohm Shallow Car Subwoofer (SW-SML8D4)

• Peak Power: 800 watts
• RMS Power: 400 watts
• Impedance: Dual 4 ohm
• Pressed Paper cone
• Pressed Foam surround
• Mount depth: 3.9"
• Sensitivity: 82.5 dB

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List price $203.99
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• Peak Power: 800 watts
• RMS Power: 400 watts
• Impedance: Dual 4 ohm
• Pressed Paper cone
• Pressed Foam surround
• Mount depth: 3.9"
• Sensitivity: 82.5 dB

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Rockford Fosgate Power T2 T2S2-16 (Open Box, Great)

5000W Peak (2500W RMS) 16" Power Series Single 2-ohm Car Subwoofer

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Rockford Fosgate Power T2 T2S2-16 (Open Box, Great)

5000W Peak (2500W RMS) 16" Power Series Single 2-ohm Car Subwoofer

• Peak Power: 5000 watts
• RMS Power: 2500 watts
• Impedance: Single 2 ohm
• Glass Fiber Cone
• Injection molded foam Surround
• Mount depth: 10.47"
• Sensitivity: 90 dB

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List price $1299.99
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• Peak Power: 5000 watts
• RMS Power: 2500 watts
• Impedance: Single 2 ohm
• Glass Fiber Cone
• Injection molded foam Surround
• Mount depth: 10.47"
• Sensitivity: 90 dB

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Diamond Audio DES82 (Open Box, Great)

500W Peak (250W RMS) 8" DES Series Dual 2-ohm Car Subwoofer

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Diamond Audio DES82 (Open Box, Great)

500W Peak (250W RMS) 8" DES Series Dual 2-ohm Car Subwoofer

• Peak Power: 500 watts
• RMS Power: 250 watts
• Fiber-Reinforced High Strength Paper Cone
• Impedance: Dual 2 ohm
• Sensitivity: 82 dB

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List price $219.99
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• Peak Power: 500 watts
• RMS Power: 250 watts
• Fiber-Reinforced High Strength Paper Cone
• Impedance: Dual 2 ohm
• Sensitivity: 82 dB

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Alpine R2-W12D2 (Open Box, Great)

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

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Alpine R2-W12D2 (Open Box, Great)

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

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List price $540.00
-40% $323.96
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• 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

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DS18 SLC8S (Open Box, Great)

400W Peak (200W RMS) 8" SELECT Series Single 4-ohm Car Subwoofer

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DS18 SLC8S (Open Box, Great)

400W Peak (200W RMS) 8" SELECT Series Single 4-ohm Car Subwoofer

• Peak Power: 400 watts
• RMS Power: 200 watts
• Impedance: Single 4 ohm
• Paper Cone
• Foam Surround
• Mount depth: 3.85"
• Sensitivity: 84 dB

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List price $82.95
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• Peak Power: 400 watts
• RMS Power: 200 watts
• Impedance: Single 4 ohm
• Paper Cone
• Foam Surround
• Mount depth: 3.85"
• Sensitivity: 84 dB

Limited time!

DS18 IXS12.4S (Open Box, Great)

1600W Peak (800W RMS) 12" IXS Series Single 4-ohm Shallow Car Subwoofer

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DS18 IXS12.4S (Open Box, Great)

1600W Peak (800W RMS) 12" IXS Series Single 4-ohm Shallow Car Subwoofer

• Peak Power: 1600 watts
• RMS Power: 800 watts
• Paper Cone
• Rubber Surround
• Impedance: Single 4 ohm
• Mount depth: 4.33"
• Sensitivity: 85.1 dB

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List price $263.95
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• Peak Power: 1600 watts
• RMS Power: 800 watts
• Paper Cone
• Rubber Surround
• Impedance: Single 4 ohm
• Mount depth: 4.33"
• Sensitivity: 85.1 dB

Limited time!

Kicker L7R152 (45L7R152) (Open Box, Good)

1800W Peak (900W RMS) 15” Solo-Baric L7R Series Dual 2-ohm Subwoofer

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Kicker L7R152 (45L7R152) (Open Box, Good)

1800W Peak (900W RMS) 15” Solo-Baric L7R Series Dual 2-ohm Subwoofer

• Peak Power: 1800 watts
• RMS Power: 900 watts
• Impedance: Dual 2 ohm
• Injection-molded SoloKon Cone
• Ribbed Santoprene Surround
• Mount depth: 8 3/8"
• Sensitivity: 88.05 dB

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List price $399.99
-45% $221.99
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• Peak Power: 1800 watts
• RMS Power: 900 watts
• Impedance: Dual 2 ohm
• Injection-molded SoloKon Cone
• Ribbed Santoprene Surround
• Mount depth: 8 3/8"
• Sensitivity: 88.05 dB

Limited time!

Pioneer TS-A30S4 (Open Box, Great)

1400W Peak (400W RMS) 12" A-Series Single 4-ohm Car Subwoofer

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Pioneer TS-A30S4 (Open Box, Great)

1400W Peak (400W RMS) 12" A-Series Single 4-ohm Car Subwoofer

• Peak Power: 1400 watts
• RMS Power: 400 watts
• Impedance: Single 4 ohm
• Injection Molded Polypropylene Cone
• Rubber Surround
• Mount depth: 5-3/8"
• Sensitivity: 87 dB

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List price $115.00
-39% $69.99
$62.99 with coupon | Price details

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• Peak Power: 1400 watts
• RMS Power: 400 watts
• Impedance: Single 4 ohm
• Injection Molded Polypropylene Cone
• Rubber Surround
• Mount depth: 5-3/8"
• Sensitivity: 87 dB

Rockford Fosgate Power T3S1-19 (Open Box, Great)

6000W Peak (3000W RMS) 19" Power Series Single 1-ohm Super Car Subwoofer

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Rockford Fosgate Power T3S1-19 (Open Box, Great)

6000W Peak (3000W RMS) 19" Power Series Single 1-ohm Super Car Subwoofer

• Peak Power: 6000 watts
• RMS Power: 3000 watts
• Impedance: Single 1 ohm
• Glass Fiber Cone
• Injection molded foam Surround
• Mount depth: 15.62"
• Sensitivity: 91 dB

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List price $2199.99
-15% $1,869.99

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• Peak Power: 6000 watts
• RMS Power: 3000 watts
• Impedance: Single 1 ohm
• Glass Fiber Cone
• Injection molded foam Surround
• Mount depth: 15.62"
• Sensitivity: 91 dB

Limited time!

Kicker CWRT674 (48CWRT674) (Like New (Open Box))

300W Peak (150W RMS) 6.75” CompRT Series Dual 4-ohm Shallow Subwoofer

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Kicker CWRT674 (48CWRT674) (Like New (Open Box))

300W Peak (150W RMS) 6.75” CompRT Series Dual 4-ohm Shallow Subwoofer

• Peak Power: 300 watts
• RMS Power: 150 watts
• Impedance: Dual 4 ohm
• Polypropylene Cone
• Santoprene Rubber Surround
• Mount depth: 2-3/4"
• Sensitivity: 82.6 dB

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• Peak Power: 300 watts
• RMS Power: 150 watts
• Impedance: Dual 4 ohm
• Polypropylene Cone
• Santoprene Rubber Surround
• Mount depth: 2-3/4"
• Sensitivity: 82.6 dB

JL Audio 13W7AE-D1.5 (Open Box, Great)

1500W RMS 13.5” W7AE Series Dual 1.5-ohm Car Subwoofer

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JL Audio 13W7AE-D1.5 (Open Box, Great)

1500W RMS 13.5” W7AE Series Dual 1.5-ohm Car Subwoofer


• RMS Power: 1500 watts
• Impedance: Dual 1.5 ohm
• Polypropylene Cone
• Polyester Foam Surround
• Mount depth: 10.50"
• Sensitivity: 86.3 dB

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$1,884.99

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• RMS Power: 1500 watts
• Impedance: Dual 1.5 ohm
• Polypropylene Cone
• Polyester Foam Surround
• Mount depth: 10.50"
• Sensitivity: 86.3 dB

JL Audio 10TW3-D4 (Open Box, Great)

400W RMS 10" TW3 Series Dual 4-ohm Shallow Subwoofer

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JL Audio 10TW3-D4 (Open Box, Great)

400W RMS 10" TW3 Series Dual 4-ohm Shallow Subwoofer

• RMS Power: 400 watts
• Polymer/Mica Composite Cone
• Rubber Surround
• Impedance: Dual 4 ohm
• Mount depth: 3.25"
• Sensitivity: 82.10 dB

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-15% $441.99

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• RMS Power: 400 watts
• Polymer/Mica Composite Cone
• Rubber Surround
• Impedance: Dual 4 ohm
• Mount depth: 3.25"
• Sensitivity: 82.10 dB

Limited time!

JBL Stadium 82SSI (Like New (Open Box))

1200W Peak (400W RMS) 8” Stadium Series Single 2-or 4-ohm Car Subwoofer

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JBL Stadium 82SSI (Like New (Open Box))

1200W Peak (400W RMS) 8” Stadium Series Single 2-or 4-ohm Car Subwoofer

• Peak Power: 1200 watts
• RMS Power: 400 watts
• Impedance: Single 2 or 4 ohm
• Glass Fiber Cone
• Rubber Surround
• Mount depth: 5.348"
• Sensitivity: 91 dB

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List price $299.95
-26% $220.96
$198.86 with coupon | Price details

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• Peak Power: 1200 watts
• RMS Power: 400 watts
• Impedance: Single 2 or 4 ohm
• Glass Fiber Cone
• Rubber Surround
• Mount depth: 5.348"
• Sensitivity: 91 dB

Limited time!

JL Audio 6W3V3-4 (Like New (Open Box))

150W RMS 6.5" W3v3 Series Single 4-ohm Car Subwoofer

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JL Audio 6W3V3-4 (Like New (Open Box))

150W RMS 6.5" W3v3 Series Single 4-ohm Car Subwoofer

• RMS Power: 150 watts
• Impedance: Single 4 ohm
• Mineral-Filled Polypropylene Cone
• Nitrile Butadiene Rubber NBR Surround
• Mount depth: 4.25"
• Sensitivity: 80.49 dB

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List price $319.99
-15% $271.99
$244.79 with coupon | Price details

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• RMS Power: 150 watts
• Impedance: Single 4 ohm
• Mineral-Filled Polypropylene Cone
• Nitrile Butadiene Rubber NBR Surround
• Mount depth: 4.25"
• Sensitivity: 80.49 dB

Limited time!

Kicker L7S84 (44L7S84) (Open Box, Great)

900W Peak (450W RMS) 8” Solo-Baric L7S Series Dual 4-ohm Subwoofer

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Kicker L7S84 (44L7S84) (Open Box, Great)

900W Peak (450W RMS) 8” Solo-Baric L7S Series Dual 4-ohm Subwoofer

• Peak Power: 900 watts
• RMS Power: 450 watts
• Impedance: Dual 4 ohm
• Injection Molded Polypropylene Cone
• Ribbed Santoprene Surround
• Mount depth: 4-3/4"
• Sensitivity: 82.37 dB

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List price $239.99
-36% $153.99
$138.59 with coupon | Price details

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• Peak Power: 900 watts
• RMS Power: 450 watts
• Impedance: Dual 4 ohm
• Injection Molded Polypropylene Cone
• Ribbed Santoprene Surround
• Mount depth: 4-3/4"
• Sensitivity: 82.37 dB

Limited time!

Infinity Kappa 83WDSSI (INFSUBKA83WDSSIAM) (Open Box, Great)

1200W Peak (400W RMS) 8” Kappa Series Single 2-or 4-ohm Car Subwoofer

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Infinity Kappa 83WDSSI (INFSUBKA83WDSSIAM) (Open Box, Great)

1200W Peak (400W RMS) 8” Kappa Series Single 2-or 4-ohm Car Subwoofer

• Peak Power: 1200 watts
• RMS Power: 400 watts
• Impedance: Single 2 or 4 ohm
• Glass Fiber Cone
• Rubber Surround
• Mount depth: 5.42"
• Sensitivity: 91 dB

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List price $289.95
-32% $195.97
$176.37 with coupon | Price details

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• Peak Power: 1200 watts
• RMS Power: 400 watts
• Impedance: Single 2 or 4 ohm
• Glass Fiber Cone
• Rubber Surround
• Mount depth: 5.42"
• Sensitivity: 91 dB

Sundown Audio SML-10 D2 10" (SML10D2) (Open Box, Great)

1200W Peak (600W RMS) 10" SML Series Dual 2-ohm Shallow Car Subwoofer (SW-SML10D2)

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Sundown Audio SML-10 D2 10" (SML10D2) (Open Box, Great)

1200W Peak (600W RMS) 10" SML Series Dual 2-ohm Shallow Car Subwoofer (SW-SML10D2)

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Pressed Paper cone
• Pressed Foam surround
• Mount depth: 3.78"
• Sensitivity: 86.1 dB

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List price $263.99
-36% $167.99

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• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 2 ohm
• Pressed Paper cone
• Pressed Foam surround
• Mount depth: 3.78"
• Sensitivity: 86.1 dB

Sundown Audio SA-15 v.3 D4 10" (SA15V3D4) (Open Box, Good)

3000W Peak (1500W RMS) 15" SA Series Dual 4-ohm Car Subwoofer (SAV315D4)

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Sundown Audio SA-15 v.3 D4 10" (SA15V3D4) (Open Box, Good)

3000W Peak (1500W RMS) 15" SA Series Dual 4-ohm Car Subwoofer (SAV315D4)

• Peak Power: 3000 watts
• RMS Power: 1500 watts
• Impedance: Dual 4 ohm
• Competition Grade Paper Cone
• Foam Surround
• Mount depth: 8.65"
• Sensitivity: 87.08 dB

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List price $539.99
-50% $269.99
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• Peak Power: 3000 watts
• RMS Power: 1500 watts
• Impedance: Dual 4 ohm
• Competition Grade Paper Cone
• Foam Surround
• Mount depth: 8.65"
• Sensitivity: 87.08 dB

Limited time!

Massive Audio GTX122H (Open Box, Great)

1600W Peak (800W RMS) 12" GTX Series Dual 2-ohm Car Subwoofer

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Massive Audio GTX122H (Open Box, Great)

1600W Peak (800W RMS) 12" GTX Series Dual 2-ohm Car Subwoofer

• Peak Power: 1600 watts
• RMS Power: 800 watts
• Impedance: Dual 2 ohm
• UV-treated Non-Pressed Paper cone
• Pressed Foam surround
• Mount depth: 6.69"
• Sensitivity: 88 dB

10% Off Open Box!
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List price $199.99
-37% $125.99
$113.39 with coupon | Price details

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• Peak Power: 1600 watts
• RMS Power: 800 watts
• Impedance: Dual 2 ohm
• UV-treated Non-Pressed Paper cone
• Pressed Foam surround
• Mount depth: 6.69"
• Sensitivity: 88 dB

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    FAQ for Universal Subwoofers in 1981 Thunderbird

    Q: Can I upgrade or change the Universal Subwoofers in 1981 Ford Thunderbird?

    A: Yes this page includes all the best Universal Subwoofers that work in your Thunderbird.

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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
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