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1981 Ford Thunderbird

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Universal gear includes car amplifiers, subs, and other products that do not install in a specific location or require fitment to integrate with a vehicle.

Overview Upgrade your Speakers Add a Subwoofer Add an Amplifier Digital Sound Processors Audio Installation & Accessories Add a Backup Camera Dads & Grads Sale

Universal-Fit Audio for 1981 Ford Thunderbird

When thinking of universal gear, we consider products like a car amp that gives more power to your speakers or subs, cell phone chargers, equalizers and sound processors, rear-seat entertainment and video monitors, as well as dash cameras.

Better sound with your factory radio

Better sound with a factory radio

Love your factory look or can't replace the stereo? We got you covered.

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Price Range
Product Fitment Type
Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.
Total Peak Power Output
The total peak power output is measured as the wattage per channel multiplied by the number of channels, and is calculated at the lowest level of operating impedance.

It is measured during a brief musical burst, such as a sudden drum accent. Some manufacturers display peak power ratings on the face of their products to increase the appeal.

The RMS power rating is more accurate, and we recommend using it for product comparison.
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
Remote bass/level controller
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
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MTX WET75.4 + Belva BAK44

400W Wet Series 4-Channel All Weather Class A/B Marine/Powersports Compact Amplifier + Belva 4 Gauge Amp Wiring kit

WET75.4, BAK44 big
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MTX WET75.4 + Belva BAK44

400W Wet Series 4-Channel All Weather Class A/B Marine/Powersports Compact Amplifier + Belva 4 Gauge Amp Wiring kit

• RMS Power: 75W x 4 @ 4 ohm, 100W x 4 @ 2 ohm
• Total Peak Power: 400W
• Plastic Cover Over Control-Adjustments
• Dimensions: 12.15"W x 6.40"L x 2.25"H

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• RMS Power: 75W x 4 @ 4 ohm, 100W x 4 @ 2 ohm
• Total Peak Power: 400W
• Plastic Cover Over Control-Adjustments
• Dimensions: 12.15"W x 6.40"L x 2.25"H

Alpine KTA-200M with NVX 8 Gauge Amp Kit

200W RMS Class D Monoblock Subwoofer Amplifier

KTA-200M, XKIT82 big
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Alpine KTA-200M with NVX 8 Gauge Amp Kit

200W RMS Class D Monoblock Subwoofer Amplifier

• Power stack Capable
• CTA-2006 Compliant
• Fits in the open space behind Alpine’s iLX-W650
• 100W x 1 RMS
• 200W x 1 RMS
• 400W x 1 DPP
• Includes Amplifier Wiring Kit

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• Power stack Capable
• CTA-2006 Compliant
• Fits in the open space behind Alpine’s iLX-W650
• 100W x 1 RMS
• 200W x 1 RMS
• 400W x 1 DPP
• Includes Amplifier Wiring Kit

NVX - Worth the Envy - Direct to Consumer Car Audio

Infinity DSP4425 with Amplifier Wiring Kit

200W 4-channel Class A/B Amplifier with Built in Digital Signal Processing (DSP)

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Infinity DSP4425 with Amplifier Wiring Kit

200W 4-channel Class A/B Amplifier with Built in Digital Signal Processing (DSP)

• 25 Watts RMS x 4 @ 4 ohm
• Total Peak Power: 200 Watts
• CEA-2006 Compliant Amplifier
• Soft start turn-on
• Speaker-level (high-level) inputs
• Includes Amplifier Wiring Kit

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• 25 Watts RMS x 4 @ 4 ohm
• Total Peak Power: 200 Watts
• CEA-2006 Compliant Amplifier
• Soft start turn-on
• Speaker-level (high-level) inputs
• Includes Amplifier Wiring Kit

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Rockford Fosgate Punch P300X2 with Amplifier Wiring Kit

300W RMS Punch Series 2-Channel Stereo Class AB Car Power Amplifier (P300X.2)

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Rockford Fosgate Punch P300X2 with Amplifier Wiring Kit

300W RMS Punch Series 2-Channel Stereo Class AB Car Power Amplifier (P300X.2)

• 100W x 2 Chan. @ 4 ohm
• 150W x 2 Chan. @ 2 ohm
• Built In NOMAD "Real Time" Analog Computer
• 2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• MESHA3 Reduces MOSFET Temperatures for Improved Durability

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• 100W x 2 Chan. @ 4 ohm
• 150W x 2 Chan. @ 2 ohm
• Built In NOMAD "Real Time" Analog Computer
• 2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• MESHA3 Reduces MOSFET Temperatures for Improved Durability

DS18 SXE-3000.4D/BK (Black) with Belva 4 Gauge Amp Kit

3000W Peak (1000W RMS) Class D SXE Series 4-Channel Car Amplifier

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DS18 SXE-3000.4D/BK (Black) with Belva 4 Gauge Amp Kit

3000W Peak (1000W RMS) Class D SXE Series 4-Channel Car Amplifier

• 200 watts x 4 channel @ 4 ohm
• 320 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 1,000 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• Includes Amplifier Wiring Kit

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• 200 watts x 4 channel @ 4 ohm
• 320 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 1,000 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• Includes Amplifier Wiring Kit

Hertz HCP 1MDK with NVX 4 Gauge Amp Kit

2480 Peak Monoblock Class-D Marine Car Audio Amplifier

HCP1MDK_XKIT42 big
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Hertz HCP 1MDK with NVX 4 Gauge Amp Kit

2480 Peak Monoblock Class-D Marine Car Audio Amplifier

• 600 watts x 1 channel @ 4 ohm
• 1100 watts x 1 channel @ 2 ohm
• Total RMS Power: 1240 watts
• Corrosion Protection
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 600 watts x 1 channel @ 4 ohm
• 1100 watts x 1 channel @ 2 ohm
• Total RMS Power: 1240 watts
• Corrosion Protection
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Massive Audio T2 with Amplifier Wiring Kit

800 Watts RMS @ 1 Ohm Monoblock Amplifier + NVX 4 Gauge Amp Wiring Kit

T2, XKIT42 big
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Massive Audio T2 with Amplifier Wiring Kit

800 Watts RMS @ 1 Ohm Monoblock Amplifier + NVX 4 Gauge Amp Wiring Kit

• 200 Watts RMS x 1 @ 4 ohm
• 400 Watts RMS x 1 @ 2 ohm
• 800 Watts RMS x 1 @ 1 ohm
• Total Peak Power: 1600 Watts
• CEA-2006 Compliant/Preamp Outputs/LPF
• 4.25"W x 7.99"L x1.6 "H
• Includes Amplifier Wiring Kit

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• 200 Watts RMS x 1 @ 4 ohm
• 400 Watts RMS x 1 @ 2 ohm
• 800 Watts RMS x 1 @ 1 ohm
• Total Peak Power: 1600 Watts
• CEA-2006 Compliant/Preamp Outputs/LPF
• 4.25"W x 7.99"L x1.6 "H
• Includes Amplifier Wiring Kit

DS18 SXE-1200.4/BK (Black) with Belva 4 Gauge Amp Kit

1200W Peak (400W RMS) Class AB SXE Series 4-channel Car Amplifier

SXE12004BK_BAK44 big
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DS18 SXE-1200.4/BK (Black) with Belva 4 Gauge Amp Kit

1200W Peak (400W RMS) Class AB SXE Series 4-channel Car Amplifier

• 60 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class A/B 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• Includes Amplifier Wiring Kit

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• 60 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class A/B 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• Includes Amplifier Wiring Kit

Hifonics HCM-400.4D with Belva 4 Gauge Amp Kit

400W Peak Colossus Mini Series Class-D 4-Channel Amplifier with Bass Remote

HCM4004D_BAK44 big
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Hifonics HCM-400.4D with Belva 4 Gauge Amp Kit

400W Peak Colossus Mini Series Class-D 4-Channel Amplifier with Bass Remote

• 4 x 50 @ 4 ohm
• 4 x 100 @ 2 ohm
• Bridged: 2 x 200 @ 4 ohm
• Total Peak Power: 400W
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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61
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• 4 x 50 @ 4 ohm
• 4 x 100 @ 2 ohm
• Bridged: 2 x 200 @ 4 ohm
• Total Peak Power: 400W
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Massive Audio T2 with Belva 8 Gauge Amp Kit

1600W Peak (800W RMS) Trident Series Class D 1 Ohm Powersports Monoblock Amplifier

MAT2_BAK82 big
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Massive Audio T2 with Belva 8 Gauge Amp Kit

1600W Peak (800W RMS) Trident Series Class D 1 Ohm Powersports Monoblock Amplifier

• 200 watts x 1 channel @ 4 ohm
• 400 watts x 1 channel @ 2 ohm
• 800 watts x 1 channel @ 1 ohm
• Total RMS Power: 800 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 200 watts x 1 channel @ 4 ohm
• 400 watts x 1 channel @ 2 ohm
• 800 watts x 1 channel @ 1 ohm
• Total RMS Power: 800 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

AudioControl ACX-300.2 with NVX 8 Gauge Amp Kit

300W RMS ACX Series Class-D 2-Channel Marine Amplifier

ACX3002_XKIT82 big
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AudioControl ACX-300.2 with NVX 8 Gauge Amp Kit

300W RMS ACX Series Class-D 2-Channel Marine Amplifier

• 75 watts x 2 channel @ 4 ohm
• 150 watts x 2 channel @ 2 ohm
• Bridged: 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 2 ohm Stable 2-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 75 watts x 2 channel @ 4 ohm
• 150 watts x 2 channel @ 2 ohm
• Bridged: 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 2 ohm Stable 2-Channel Amplifier
• Includes Amplifier Wiring Kit

Sound Extreme by ECOXGEAR SEI-AMP30011 with NVX 8 Gauge Amp Kit

300W RMS Class-D Monoblock High Definition Marine Amplifier

A30011_XKIT82 big
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Sound Extreme by ECOXGEAR SEI-AMP30011 with NVX 8 Gauge Amp Kit

300W RMS Class-D Monoblock High Definition Marine Amplifier

• 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 4 ohm Stable Monoblock Amplifier
• Marine-grade sealed die-cast aluminum chassis
• Includes Amplifier Wiring Kit

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61
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• 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 4 ohm Stable Monoblock Amplifier
• Marine-grade sealed die-cast aluminum chassis
• Includes Amplifier Wiring Kit

DS18 SMD-3000.1D with NVX 1/0 Gauge Amp Kit

3000W RMS Class D SMD Series Monoblock Car Amplifier with Bass Remote

SMD30001D_XKIT02 big
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DS18 SMD-3000.1D with NVX 1/0 Gauge Amp Kit

3000W RMS Class D SMD Series Monoblock Car Amplifier with Bass Remote

• 1300 watts x 1 channel @ 4 ohm
• 2200 watts x 1 channel @ 2 ohm
• 3000 watts x 1 channel @ 1 ohm
• Total RMS Power: 3000 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 1300 watts x 1 channel @ 4 ohm
• 2200 watts x 1 channel @ 2 ohm
• 3000 watts x 1 channel @ 1 ohm
• Total RMS Power: 3000 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Rockford Fosgate T1000-4AD + Free NVX XFLOC4 Line-Output-Converter and Amp Kit

1000W 4-Channel Power Amplifier + NVX 4-Channel L.O.C + 4 Gauge Amp Kit

T1000-4AD, XFLOC4, BAK44 big
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Rockford Fosgate T1000-4AD + Free NVX XFLOC4 Line-Output-Converter and Amp Kit

1000W 4-Channel Power Amplifier + NVX 4-Channel L.O.C + 4 Gauge Amp Kit

• 1000W RMS
• 250W x 4-Chan @ 4 Ohm
• NOMAD Real Time Computer Protection
• 50-500 Hz LP/AP/HP Crossovers
• Constant Power

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• 1000W RMS
• 250W x 4-Chan @ 4 Ohm
• NOMAD Real Time Computer Protection
• 50-500 Hz LP/AP/HP Crossovers
• Constant Power

Crunch PZ2-2030.2D with Amplifier Wiring Kit

1000W RMS Powerzone 2 Series Class-D 2-Channel Car Amplifier Package

PZ2-2030.2D, BAK42 big
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Crunch PZ2-2030.2D with Amplifier Wiring Kit

1000W RMS Powerzone 2 Series Class-D 2-Channel Car Amplifier Package

• 4 ohm: 2 x 500
• 2 ohm: 2 x 1000
• 4 ohm: 1 x 2000
• Total RMS Power: 2000 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 4 ohm: 2 x 500
• 2 ohm: 2 x 1000
• 4 ohm: 1 x 2000
• Total RMS Power: 2000 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-1325.1 with Belva 8 Gauge Amp Kit

1325W Peak Class AB V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

DR13251_BAK82 big
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Crunch DR-1325.1 with Belva 8 Gauge Amp Kit

1325W Peak Class AB V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

• 650 watts x 1 channel @ 4 ohm
• 1325 watts x 1 channel @ 2 ohm
• Total peak power output: 1325 watts
• Class A/B 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 650 watts x 1 channel @ 4 ohm
• 1325 watts x 1 channel @ 2 ohm
• Total peak power output: 1325 watts
• Class A/B 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-3125.2D with Belva 4 Gauge Amp Kit

3125W Peak Class D V-Drive Series 2-Channel Full Range Car Amplifier

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Crunch DR-3125.2D with Belva 4 Gauge Amp Kit

3125W Peak Class D V-Drive Series 2-Channel Full Range Car Amplifier

• 780 watts x 2 channel @ 4 ohm
• 1560 watts x 2 channel @ 2 ohm
• Bridged: 3125 watts x 1 channel @ 4 ohm
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 780 watts x 2 channel @ 4 ohm
• 1560 watts x 2 channel @ 2 ohm
• Bridged: 3125 watts x 1 channel @ 4 ohm
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Kenwood eXcelon XM160-2 with NVX 8 Gauge Amp Kit

160W RMS eXcelon Series Class D 2-Channel Compact Amplifier for select 2014-up Harley-Davidson® motorcycles

XM1602_XKIT82 big
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Kenwood eXcelon XM160-2 with NVX 8 Gauge Amp Kit

160W RMS eXcelon Series Class D 2-Channel Compact Amplifier for select 2014-up Harley-Davidson® motorcycles

• 80 watts x 2 channel @ 2 ohm
• Total RMS Power: 160 watts
• Class D 2 ohm Stable 2-Channel Amplifier
• Plug & Play Power, Speaker, & Input Wiring
• Includes Amplifier Wiring Kit

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-21% $524.99

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• 80 watts x 2 channel @ 2 ohm
• Total RMS Power: 160 watts
• Class D 2 ohm Stable 2-Channel Amplifier
• Plug & Play Power, Speaker, & Input Wiring
• Includes Amplifier Wiring Kit

American Bass GODFATHER 11D with NVX 8 Gauge Amp Kit

Godfather Series Class-D Monoblock Amplifier

GF11D_XKIT82 big
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American Bass GODFATHER 11D with NVX 8 Gauge Amp Kit

Godfather Series Class-D Monoblock Amplifier

• Adjustable bass boost for customizable sound preferences
• Class D Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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61
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-22% $2,450.45

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• Adjustable bass boost for customizable sound preferences
• Class D Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Rockford Fosgate PM400X4 + NVX XFLOC4 Line-Output-Converter + Amp Kit

400W 4-Channel Marine Amplifier + NVX 4-Channel L.O.C + Amp Kit

PM400X4, XFLOC4, BAK44 big
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Rockford Fosgate PM400X4 + NVX XFLOC4 Line-Output-Converter + Amp Kit

400W 4-Channel Marine Amplifier + NVX 4-Channel L.O.C + Amp Kit

• RMS: 50 watts x 4 chan. @ 4 ohm, 100 watts x 4 chan. @ 2 ohm, Bridged 200 watts x 2 chan. @ 4 ohm
• CEA-2006 Compliant
• Features C.L.E.A.N. Set-up
• Protected against Dust, UV, & Corrosion
• Marine grade two part epoxy coating on circuit boards

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Universal Icon Universal – fits most vehicles.

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60
List price $623.72
-17% $519.99

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• RMS: 50 watts x 4 chan. @ 4 ohm, 100 watts x 4 chan. @ 2 ohm, Bridged 200 watts x 2 chan. @ 4 ohm
• CEA-2006 Compliant
• Features C.L.E.A.N. Set-up
• Protected against Dust, UV, & Corrosion
• Marine grade two part epoxy coating on circuit boards

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    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 1981 Ford Thunderbird?

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