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.

Up to 249.99 watts (22)

250–499.99 watts (83)

500–999.99 watts (137)

1,000–1,499.99 watts (61)

1,500 watts or more (66)

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.

Up to 499.99 watts (19)

500–999.99 watts (41)

1,000–1,999.99 watts (74)

2,000–2,999.99 watts (42)

3,000 watts or more (32)

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.

Yes (197)

No (124)

Optional (79)

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.

Yes (225)

No (73)

Optional (66)

Yes - with included adapter (18)

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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• 180 watts Peak Each, 60 watts RMS Each
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Kicker 12" Subwoofer (43VC124) & Amplifier (46CXA4001T) w/ Free Amp Install Kit

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DS18 SMD-5000.1D 5000W RMS Class D Monoblock Car Amplifier
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1500 Watts Ground Pounder Mono Subwoofer Car Amplifier

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• Bass Remote Included
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• Variable Electronic Crossover
• Bass Remote Included
• Subsonic Filter
• Switchable Bass Boost

NVX VCW84v3 + NDA12001 + XKIT42

1300 Watt Peak 8” VC-Series v3 Dual 4-Ohm Car Subwoofer + Monoblock Amplifier with Remote Bass Knob with Complete 2-Channel Amplifier Wiring Kit w/ RCA for Amplifiers up to 1500 Watts

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NVX VCW84v3 + NDA12001 + XKIT42

1300 Watt Peak 8” VC-Series v3 Dual 4-Ohm Car Subwoofer + Monoblock Amplifier with Remote Bass Knob with Complete 2-Channel Amplifier Wiring Kit w/ RCA for Amplifiers up to 1500 Watts

• Two 8" VCW84v3 VC-Series v3 1300W RMS Subwoofers
• 2400W Peak (1200W RMS) Class D NDA12001 Monoblock Amplifier
• XKIT42 Complete 4 AWG Amplifier Wiring Kit
• 1-year Warranty from the Original Purchase Date

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Universal – fits most vehicles.

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Kenwood KAC-D3104 with Amplifier Wiring Kit

Class D 4-Channel Amplifier (600 Watts Peak Power)

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Kenwood KAC-D3104 with Amplifier Wiring Kit

Class D 4-Channel Amplifier (600 Watts Peak Power)

• 4 ohm: 50 watts x 4 chan.
• 2 ohm: 75 watts x 4 chan.
• Total Peak Power: 600 Watts
• Speaker Level Input
• Signal Sensing Turn-On
• Variable Low Pass/High Pass Filter
• Includes Amplifier Wiring Kit

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Car Amplifier Packages & Bundles for your 1990 740

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Kicker TCWRT82 Subwoofer + CXA400.1 Amp + Bass Remote w/ Free Amp Install Kit

Kicker TCWRT82 Subwoofer + CXA400.1 Amp + Bass Remote w/ Free Amp Install Kit

Kicker 52VCVR122 + NVX VADM1 v2 w/ Free Amp Install Kit

Kicker 52VCVR122 + NVX VADM1 v2 w/ Free Amp Install Kit

Kicker TL7T102 Subwoofer + NVX VADM1 v2 Amplifier w/ Free Amp Install Kit

Kicker TL7T102 Subwoofer + NVX VADM1 v2 Amplifier w/ Free Amp Install Kit

2 Kicker Subwoofers (CWTB82) + NVX Amplifier (VADM2v2) w/ Free Amp Install Kit

2 Kicker Subwoofers (CWTB82) + NVX Amplifier (VADM2v2) w/ Free Amp Install Kit

Kicker TCWRT102 + NVX VADM1 v2 w/ Free Amp Install Kit

Kicker TCWRT102 + NVX VADM1 v2 w/ Free Amp Install Kit

Kicker CWRT84 (48CWRT84) w/ NVX Amplifier + Amp Kit

Kicker CWRT84 (48CWRT84) w/ NVX Amplifier + Amp Kit

Kicker CXA660.5T (46CXA6605T) w/ Remote Bass Controller

Kicker CXA660.5T (46CXA6605T) w/ Remote Bass Controller

Kicker CDF124 Subwoofer + CXA400.1 Amp + Remote w/ Free Amp Install Kit

Kicker CDF124 Subwoofer + CXA400.1 Amp + Remote w/ Free Amp Install Kit

Kicker TL7R102 Subwoofer + NVX VADM1 v2 Amplifier w/ Free Amp Install Kit

Kicker TL7R102 Subwoofer + NVX VADM1 v2 Amplifier w/ Free Amp Install Kit

DS18 SMD-300.4AB 4-Channel Amplifier + NVX Amp Kit

DS18 SMD-300.4AB 4-Channel Amplifier + NVX Amp Kit

NVX 6.5" & 6x9" E-Series Speaker with Installation Kit

NVX 6.5" & 6x9" E-Series Speaker with Installation Kit

Hifonics A1200.1D with Belva 8 Gauge Amp Kit

Hifonics A1200.1D with Belva 8 Gauge Amp Kit

Kicker 12" Subwoofer (43VC124) & Amplifier (46CXA4001T) w/ Free Amp Install Kit

Kicker 12" Subwoofer (43VC124) & Amplifier (46CXA4001T) w/ Free Amp Install Kit

DS18 SMD-2000.1D w/ NVX Amp Kit + 1.0 Farad Capacitor

DS18 SMD-2000.1D w/ NVX Amp Kit + 1.0 Farad Capacitor

Kicker 50VCWC124 Subwoofer + NVX VADM1 v2 Amplifier w/ Free Amp Install Kit

Kicker 50VCWC124 Subwoofer + NVX VADM1 v2 Amplifier w/ Free Amp Install Kit

DS18 SMD-5000.1D + NVX Amp Kit + Capacitor

DS18 SMD-5000.1D + NVX Amp Kit + Capacitor

DS18 SXE-1200.4/RD (Red) with Belva 4 Gauge Amp Kit

DS18 SXE-1200.4/RD (Red) with Belva 4 Gauge Amp Kit

Crunch GP-1500.1 Amplifier + Free Amp Wiring Kit

Crunch GP-1500.1 Amplifier + Free Amp Wiring Kit

NVX VCW84v3 + NDA12001 + XKIT42

NVX VCW84v3 + NDA12001 + XKIT42

Kenwood KAC-D3104 with Amplifier Wiring Kit

Kenwood KAC-D3104 with Amplifier Wiring Kit

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