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1977 Audi Fox

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Use our shopping filters to find the right 2/3/4-channel amp to power upgraded speakers properly.

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

Amps for Adding Speakers for 1977 Audi Fox

Some vehicles require an amp bypass module, a line-output converter like the NVX XLCA2 or AudioControl LC2i, or a DSP to integrate with your factory radio and avoid bass roll-off. Bass roll-off occurs when a factory radio's crossover is designed only for the original equipment speakers, resulting in a not complete signal being sent to your new aftermarket amp.

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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.
Amplifier Key Features
Amplifiers can offer a diverse array of features. If you select more than one feature, then you will view amplifiers that have ALL features selected. These include speaker-level inputs that facilitate seamless integration with factory audio systems, Bluetooth connectivity suitable for ATV/UTV or Classic vehicle setups, built-in DSPs that provide enhanced control over your audio signal, and a host of other functionalities to explore.
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.
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.
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.
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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.
Sonic Certified Amplifier
Sonic Certified amplifiers have been tested by the experts at Sonic Electronix to meet or exceed the wattage ratings provided by the manufacturer. If this is marked as Yes, then you can trust the wattage ratings. If marked as No, then we have tested the amplifier and it did not meet the advertised wattage ratings. If marked as Not Tested, then the Sonic Electronix experts have not yet been able to test the amp.
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.

Amp Bluetooth Connectivity
This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.
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MTX Thunder TH900.6

900W RMS Class D Thunder Series 6 Channel Car Amplifier

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MTX Thunder TH900.6

900W RMS Class D Thunder Series 6 Channel Car Amplifier

• 75 watts x 6 channel @ 4 ohm
• 150 watts x 6 channel @ 2 ohm
• Bridged: 300 watts x 3 channel @ 4 ohm
• Total RMS Power: 900 watts
• Class D 1 ohm Stable 6-Channel-Channel Amplifier

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Rockford Fosgate Power T400X2ad

400W RMS Class AD Power Series 2 Channel Amplifier

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Rockford Fosgate Power T400X2ad

400W RMS Class AD Power Series 2 Channel Amplifier

• 200 watts x 2 channel @ 4 ohm
• 200 watts x 2 channel @ 2 ohm
• Bridged: 400 watts x 1 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class AD 2 ohm Stable 2-Channel Amplifier

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NVX - Worth the Envy - Direct to Consumer Car Audio

Diamond Audio DES400.4D

800W RMS Class D Diamond Elite Series 4-Channel Full Range Car Amplifier

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Diamond Audio DES400.4D

800W RMS Class D Diamond Elite Series 4-Channel Full Range Car Amplifier

• 140 watts x 4 channel @ 4 ohm
• 170 watts x 4 channel @ 2 ohm
• Bridged: 400 watts x 2 channel @ 4 ohm
• Total RMS Power: 800 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier

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DS18 Hydro NXL-X600.4D

1600W Peak Class D HYDRO Series 4-Channel Marine and Powersports Amplifier

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DS18 Hydro NXL-X600.4D

1600W Peak Class D HYDRO Series 4-Channel Marine and Powersports Amplifier

• 150 watts x 4 channel @ 4 ohm
• 200 watts x 4 channel @ 2 ohm
• Bridged: 400 watts x 2 channel @ 4 ohm
• Total RMS Power: 1600 watts
• IPX6 waterproof rating
• Class D 2 ohm Stable 4-Channel-Channel Amplifier

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• 150 watts x 4 channel @ 4 ohm
• 200 watts x 4 channel @ 2 ohm
• Bridged: 400 watts x 2 channel @ 4 ohm
• Total RMS Power: 1600 watts
• IPX6 waterproof rating
• Class D 2 ohm Stable 4-Channel-Channel Amplifier

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Deaf Bonce Machete MFA 2.80

240W RMS Class D Machete Series 2-Channel Car Amplifier

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Deaf Bonce Machete MFA 2.80

240W RMS Class D Machete Series 2-Channel Car Amplifier

• 80 watts x 2 channel @ 4 ohm
• 120 watts x 2 channel @ 2 ohm
• Bridged: 240 watts x 1 channel @ 4 ohm
• Total RMS Power: 240 watts
• Class D 2 ohm Stable 2-Channel Amplifier

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NVX XAPK4 + XIV25 (XKIT42 Sub)

NVX XAPK4 + XIV25 (XKIT42 Sub)

$109.99

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DS18 FX6

4500W Peak (1500W RMS) Class D FX Series 6-Channel Car Amplifier with LED

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DS18 FX6

4500W Peak (1500W RMS) Class D FX Series 6-Channel Car Amplifier with LED

• 180 watts x 6 channel @ 4 ohm
• 250 watts x 6 channel @ 2 ohm
• Bridged: 500 watts x 3 channel @ 4 ohm
• Total RMS Power: 1500 watts
• Class D 2 ohm Stable 6-Channel-Channel Amplifier

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NVX XKIT46

NVX XKIT46

$129.99

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JL Audio VX700/5i

700W RMS Class D VXi Series 5 Channel Car Amplifier with Built-in DSP

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JL Audio VX700/5i

700W RMS Class D VXi Series 5 Channel Car Amplifier with Built-in DSP

• 75 watts x 4 channel + 180 watts x 1 channel @ 4 ohm
• 100 watts x 4 channel + 300 watts x 1 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 300 watts x 1 channel @ 2 ohm
• Total RMS Power: 700 watts
• Class D 2 ohm Stable 5-Channel Amplifier
• Includes integrated DSP

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DS18 Hydro NXL-M4

1800W Peak Class D HYDRO Series 4-Channel Full Range Marine and Powersports Amplifier

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DS18 Hydro NXL-M4

1800W Peak Class D HYDRO Series 4-Channel Full Range Marine and Powersports Amplifier

• 150 watts x 4 channel @ 4 ohm
• 230 watts x 4 channel @ 2 ohm
• Bridged: 440 watts x 2 channel @ 4 ohm
• Total Peak Power: 1800 watts
• IPX5 waterproof rating
• Class D 2 ohm Stable 4-Channel-Channel Amplifier

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• 150 watts x 4 channel @ 4 ohm
• 230 watts x 4 channel @ 2 ohm
• Bridged: 440 watts x 2 channel @ 4 ohm
• Total Peak Power: 1800 watts
• IPX5 waterproof rating
• Class D 2 ohm Stable 4-Channel-Channel Amplifier

DS18 Hydro NXL-M5

3600W Peak (1520W RMS) Class D Hydro Series 5-Channel Car Amplifier with Bass Remote

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DS18 Hydro NXL-M5

3600W Peak (1520W RMS) Class D Hydro Series 5-Channel Car Amplifier with Bass Remote

• 150 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 230 watts x 4 channel + 600 watts x 1 channel @ 2 ohm
• Bridged: 440 watts x 2 channel @ 4 ohm + 600 watts x 1 channel @ 2 ohm
• Total RMS Power: 1520 watts
• Class D 2 ohm Stable 5-Channel-Channel Amplifier

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• 150 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 230 watts x 4 channel + 600 watts x 1 channel @ 2 ohm
• Bridged: 440 watts x 2 channel @ 4 ohm + 600 watts x 1 channel @ 2 ohm
• Total RMS Power: 1520 watts
• Class D 2 ohm Stable 5-Channel-Channel Amplifier

Limited time!

Wet Sounds Sinister-SDX2

1250W RMS Class D Sinister Series 2 Channel Marine Amplifier

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Wet Sounds Sinister-SDX2

1250W RMS Class D Sinister Series 2 Channel Marine Amplifier

• 400 watts x 2 channel @ 4 ohm
• 620 watts x 2 channel @ 2 ohm
• Bridged: 1250 watts x 1 channel @ 4 ohm
• Total RMS Power: 1250 watts
• Class D 2 ohm Stable 2-Channel Marine Amplifier

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• 400 watts x 2 channel @ 4 ohm
• 620 watts x 2 channel @ 2 ohm
• Bridged: 1250 watts x 1 channel @ 4 ohm
• Total RMS Power: 1250 watts
• Class D 2 ohm Stable 2-Channel Marine Amplifier

Diamond Audio HXM800.4D

800W RMS Class D Motorsport Series 4-Channel Full Range Car, Marine and Powersport Amplifier with Bluetooth

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Diamond Audio HXM800.4D

800W RMS Class D Motorsport Series 4-Channel Full Range Car, Marine and Powersport Amplifier with Bluetooth

• 120 watts x 4 channel @ 4 ohm
• 200 watts x 4 channel @ 2 ohm
• Bridged: 400 watts x 2 channel @ 4 ohm
• Total RMS Power: 800 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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DS18 Hydro NXL-M6

2700W Peak (1380W RMS) Class D NXL Series 6-Channel Car Amplifier

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DS18 Hydro NXL-M6

2700W Peak (1380W RMS) Class D NXL Series 6-Channel Car Amplifier

• 150 watts x 6 channel @ 4 ohm
• 230 watts x 6 channel @ 2 ohm
• Bridged: 440 watts x 3 channel @ 4 ohm
• Total RMS Power: 1380 watts
• Class D 2 ohm Stable 6-Channel Amplifier

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• 150 watts x 6 channel @ 4 ohm
• 230 watts x 6 channel @ 2 ohm
• Bridged: 440 watts x 3 channel @ 4 ohm
• Total RMS Power: 1380 watts
• Class D 2 ohm Stable 6-Channel Amplifier

Massive Audio TX44

960W RMS Class D Trident Series 4 Channel Marine Amplifier with Bluetooth

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Massive Audio TX44

960W RMS Class D Trident Series 4 Channel Marine Amplifier with Bluetooth

• 120 watts x 4 channel @ 4 ohm
• 240 watts x 4 channel @ 2 ohm
• Bridged: 480 watts x 2 channel @ 4 ohm
• Total RMS Power: 960 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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• 120 watts x 4 channel @ 4 ohm
• 240 watts x 4 channel @ 2 ohm
• Bridged: 480 watts x 2 channel @ 4 ohm
• Total RMS Power: 960 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Limited time!

Kicker PXA400.4 (48PXA4004)

800W Peak (400W RMS) Class D PXA Series 4-Channel Marine and Powersports Amplifier

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Kicker PXA400.4 (48PXA4004)

800W Peak (400W RMS) Class D PXA Series 4-Channel Marine and Powersports Amplifier

• 100 watts x 4 channel @ 4 ohm
• 150 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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List price $549.99
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-27% $399.96

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DS18 MP.4A

480W Peak (160W RMS) Class D HYDRO Series 4-Channel Marine and Powersports Amplifier

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DS18 MP.4A

480W Peak (160W RMS) Class D HYDRO Series 4-Channel Marine and Powersports Amplifier

• 40 watts x 4 channel @ 4 ohm
• Total RMS Power: 160 watts
• Class D 4 ohm Stable 4-Channel Amplifier
• IPX5 waterproof rating with salt and fog protection

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List price $179.95
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• 40 watts x 4 channel @ 4 ohm
• Total RMS Power: 160 watts
• Class D 4 ohm Stable 4-Channel Amplifier
• IPX5 waterproof rating with salt and fog protection

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Hertz Venezia V5

1700W RMS Class D Venezia Series 5-Channel Marine Amplifier

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Hertz Venezia V5

1700W RMS Class D Venezia Series 5-Channel Marine Amplifier

• 130 watts x 4 channel + 490 watts x 1 channel @ 4 ohm
• 220 watts x 4 channel + 820 watts x 1 channel @ 2 ohm
• Bridged: 440 watts x 2 channel @ 4 ohm + 490 watts x 1 channel @ 4 ohm
• Bridged: 440 watts x 2 channel @ 4 ohm + 820 watts x 1 channel @ 2 ohm
• Total RMS Power: 1700 watts
• Class D 2 ohm Stable 5-Channel Amplifier

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• 130 watts x 4 channel + 490 watts x 1 channel @ 4 ohm
• 220 watts x 4 channel + 820 watts x 1 channel @ 2 ohm
• Bridged: 440 watts x 2 channel @ 4 ohm + 490 watts x 1 channel @ 4 ohm
• Bridged: 440 watts x 2 channel @ 4 ohm + 820 watts x 1 channel @ 2 ohm
• Total RMS Power: 1700 watts
• Class D 2 ohm Stable 5-Channel Amplifier

Massive Audio TX48

1600W RMS Class D Trident Series 4 Channel Marine Amplifier with Bluetooth

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Massive Audio TX48

1600W RMS Class D Trident Series 4 Channel Marine Amplifier with Bluetooth

• 200 watts x 4 channel @ 4 ohm
• 400 watts x 4 channel @ 2 ohm
• Bridged: 800 watts x 2 channel @ 4 ohm
• Total RMS Power: 1600 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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• 200 watts x 4 channel @ 4 ohm
• 400 watts x 4 channel @ 2 ohm
• Bridged: 800 watts x 2 channel @ 4 ohm
• Total RMS Power: 1600 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Crunch DR-1325.4D

1325W Peak Class D V-Drive Series 4-Channel Car Amplifier

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Crunch DR-1325.4D

1325W Peak Class D V-Drive Series 4-Channel Car Amplifier

• 165 watts x 4 channel @ 4 ohm
• 330 watts x 4 channel @ 2 ohm
• Bridged: 660 watts x 2 channel @ 4 ohm
• Total peak power output: 1325 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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Diamond Audio MICRO82U

600W RMS Class D Micro8U Series 2-Channel Full Range Car Amplifier

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Diamond Audio MICRO82U

600W RMS Class D Micro8U Series 2-Channel Full Range Car Amplifier

• 200 watts x 2 channel @ 2 ohm
• 300 watts x 2 channel @ 1 ohm
• Bridged: 600 watts x 1 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 2-Channel Amplifier

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Save 30% off an NVX XKIT82 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT82 Amp Kit! No code needed — discount applies automatically at checkout.
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Diamond Audio HXM800.2D

800W RMS Class D MotorSport Series 2-Channel Car, Marine and Powersport Amplifier

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Diamond Audio HXM800.2D

800W RMS Class D MotorSport Series 2-Channel Car, Marine and Powersport Amplifier

• 300 watts x 2 channel @ 4 ohm
• 400 watts x 2 channel @ 2 ohm
• Bridged: 800 watts x 1 channel @ 4 ohm
• Total RMS Power: 800 watts
• Class D 2 ohm Stable 2-Channel Amplifier

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$499.99

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Save 30% on an NVX XKIT42 Amp Kit with Purchase! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT42 Amp Kit! No code needed — discount applies automatically at checkout.
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    FAQ for Multi-channel Amplifiers for Adding Speakers in 1977 Fox

    Q: Can I upgrade or change the Multi-channel Amplifiers for Adding Speakers in 1977 Audi Fox?

    A: Yes this page includes all the best Multi-channel Amplifiers for Adding Speakers that work in your Fox.

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