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 (138)

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 (75)

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 (198)

No (124)

Optional (80)

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 (67)

Yes - with included adapter (19)

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

Includes 6.5" & 6x9" Coaxial Speaker, Baffle Kits, (4) Damping, Roller

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

Includes 6.5" & 6x9" Coaxial Speaker, Baffle Kits, (4) Damping, Roller

• 180 watts Peak Each, 60 watts RMS Each
• 1/2" PEI (Polyetherimide) Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

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• 180 watts Peak Each, 60 watts RMS Each
• 1/2" PEI (Polyetherimide) Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

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NVX Audio Upgrade Kit – QB12SPA with 2 Pair 6.5" Speakers

1200W MAX (350W RMS) Single 12" Amplified Ported Sub Enclosure w/ Remote Bass Knob, 2 Pair 6.5" Coaxial Speakers, Amp Kit, Sound Damping, and Roller

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NVX Audio Upgrade Kit – QB12SPA with 2 Pair 6.5" Speakers

1200W MAX (350W RMS) Single 12" Amplified Ported Sub Enclosure w/ Remote Bass Knob, 2 Pair 6.5" Coaxial Speakers, Amp Kit, Sound Damping, and Roller

• 12" Amplified Loaded Subwoofer System
• 350 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control
• Includes 6.5(2) Co-axial Speaker and Damping Kits

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

1000W Peak (500W RMS) Loaded Single 10" Vented Square Truck Enclosure with 600W RMS Class D Monoblock Amplifier, 8 Gauge OFC Wiring Kit + Accessories

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

1000W Peak (500W RMS) Loaded Single 10" Vented Square Truck Enclosure with 600W RMS Class D Monoblock Amplifier, 8 Gauge OFC Wiring Kit + Accessories

Kicker 1000W Peak Loaded Single 10-Inch Vented Square Truck Enclosure
600W RMS Class D Monoblock Car/Marine/Powersports Amplifier with Bass Remote
Full Spec 8 Gauge 100-Percent OFC Complete 2-Channel Amplifier Wiring Kit
Includes Two Premium Polyurethane Foam Can Insulator Sleeve Koozies
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Kicker 1000W Peak Loaded Single 10-Inch Vented Square Truck Enclosure
600W RMS Class D Monoblock Car/Marine/Powersports Amplifier with Bass Remote
Full Spec 8 Gauge 100-Percent OFC Complete 2-Channel Amplifier Wiring Kit
Includes Two Premium Polyurethane Foam Can Insulator Sleeve Koozies
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Kicker 50VCWC124 Subwoofer + NVX VADM1 v2 Amplifier w/ Free Amp Install Kit

600W Peak Loaded Single 12" Vented Subwoofer Enclosure with 600W RMS Class D Monoblock Amplifier, 8 Gauge OFC Wiring Kit, and NVX Koozie Accessories

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

600W Peak Loaded Single 12" Vented Subwoofer Enclosure with 600W RMS Class D Monoblock Amplifier, 8 Gauge OFC Wiring Kit, and NVX Koozie Accessories

Kicker 600W Peak (300W RMS) Loaded Single 12" Hatchback Vented Enclosure
NVX 600W RMS Class D Monoblock Amplifier with Bass Remote
Full Spec 8 Gauge 100% OFC 2-Channel Wiring Kit
High-Quality RCA for Amplifiers up to 800 Watts
Premium Polyurethane Foam Can Insulator Sleeve

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Kicker 600W Peak (300W RMS) Loaded Single 12" Hatchback Vented Enclosure
NVX 600W RMS Class D Monoblock Amplifier with Bass Remote
Full Spec 8 Gauge 100% OFC 2-Channel Wiring Kit
High-Quality RCA for Amplifiers up to 800 Watts
Premium Polyurethane Foam Can Insulator Sleeve

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

2000W RMS Class D SMD Series Monoblock Car Amplifier with Bass Remote and 100% Copper True Spec 1/0 Gauge Amplifier Installation Kit + Accessories

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

2000W RMS Class D SMD Series Monoblock Car Amplifier with Bass Remote and 100% Copper True Spec 1/0 Gauge Amplifier Installation Kit + Accessories

DS18 SMD-2000.1D 2000W RMS Class D SMD Series Monoblock Car Amplifier
Wired Bass Remote for Easy Level Control
NVX XKIT02 100% Copper 1/0 Gauge True Spec Amplifier Installation Kit
1.0 Farad Digital Power Capacitor
Complete Wiring Solution includes RCA Interconnects and 20 ft Speaker Cable

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DS18 SMD-2000.1D 2000W RMS Class D SMD Series Monoblock Car Amplifier
Wired Bass Remote for Easy Level Control
NVX XKIT02 100% Copper 1/0 Gauge True Spec Amplifier Installation Kit
1.0 Farad Digital Power Capacitor
Complete Wiring Solution includes RCA Interconnects and 20 ft Speaker Cable

DS18 SMD-5000.1D + NVX Amp Kit + Capacitor

5000W RMS Class D SMD Series Monoblock Car Amplifier with Bass Remote and 2-Channel True Spec 1/0 Gauge Amplifier Installation Kit + Accessories

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DS18 SMD-5000.1D + NVX Amp Kit + Capacitor

5000W RMS Class D SMD Series Monoblock Car Amplifier with Bass Remote and 2-Channel True Spec 1/0 Gauge Amplifier Installation Kit + Accessories

DS18 SMD-5000.1D 5000W RMS Class D Monoblock Car Amplifier
Integrated VM-1 Voltmeter and Digital RGB LED Lights with Remote
NVX 1.0 Farad Digital Power Capacitor and Bass Remote
True Spec 1/0 Gauge 100% Copper Amplifier Installation Kit
Complete Wiring Solution with RCA Interconnect and 20 ft Speaker Cable

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DS18 SMD-5000.1D 5000W RMS Class D Monoblock Car Amplifier
Integrated VM-1 Voltmeter and Digital RGB LED Lights with Remote
NVX 1.0 Farad Digital Power Capacitor and Bass Remote
True Spec 1/0 Gauge 100% Copper Amplifier Installation Kit
Complete Wiring Solution with RCA Interconnect and 20 ft Speaker Cable

Audio Control LC-5.1300 with NVX 4 Gauge Amp Kit

1300w 5-channel summing amplifier + NVX XKIT46

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Audio Control LC-5.1300 with NVX 4 Gauge Amp Kit

1300w 5-channel summing amplifier + NVX XKIT46

• 5-Channel amplifier
• RMS Power: _125W x 4 @ 4 ohm, 200 W x 4 @ 2 ohm, 500W x 1 @ 2 ohm
• Select summing capabilities
• Eight speaker input

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• 5-Channel amplifier
• RMS Power: _125W x 4 @ 4 ohm, 200 W x 4 @ 2 ohm, 500W x 1 @ 2 ohm
• Select summing capabilities
• Eight speaker input

Rockford Fosgate Punch PM1000X5 with Amplifier Wiring Kit

1000W 5-Channel Powersports/Marine Amplifier

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Rockford Fosgate Punch PM1000X5 with Amplifier Wiring Kit

1000W 5-Channel Powersports/Marine Amplifier

• RMS: 75 watts x 4 chan. + 150 watts x 1 chan. @ 4 ohm, 125 watts x 4 chan. + 300 watts x 1 chan. @ 2 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
• Includes NVX XKIT46 4 Gauge Amp Wiring Kit

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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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Rockford Fosgate Prime R500X1D 500W RMS Mono Class D Amplifier + Amp Kit + Cap

500W RMS Prime Series Class D Monoblock Amplifier Package

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Rockford Fosgate Prime R500X1D 500W RMS Mono Class D Amplifier + Amp Kit + Cap

500W RMS Prime Series Class D Monoblock Amplifier Package

• RMS: 300W x 1 @ 4 ohm, 500W x 1 @ 2 ohm
• Total RMS Power: 500W
• CEA-2006 Compliant
• Remote PLC (Punch Level Control) Included
• Efficient Class-D circuit topology
• Dimensions: 8-1/2"L x 6-3/4"W x 2"H

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Crunch GP-1500.1 Amplifier + Free Amp Wiring Kit

1500 Watts Ground Pounder Mono Subwoofer Car Amplifier

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Crunch GP-1500.1 Amplifier + Free Amp Wiring Kit

1500 Watts Ground Pounder Mono Subwoofer Car Amplifier

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

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

NVX VAD17001 with Amplifier Wiring Kit

1700W RMS Class D Monoblock Car/Marine/Powersports Amp with Bass Remote (Marine Certified) + Amp Kit

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NVX VAD17001 with Amplifier Wiring Kit

1700W RMS Class D Monoblock Car/Marine/Powersports Amp with Bass Remote (Marine Certified) + Amp Kit

• RMS: 800 x 1 @ 4 ohm, 1350W x 1 @ 2 ohm, 1700W x 1 @ 1 ohm
• Total RMS Power: 1700W
• CEA-2006 Compliant
• Wired Bass Remote Included
• Efficient Class D Design
• Dimensions: 10.1"W x 5.4"D x 2.0H
• Includes Amplifier Wiring Kit

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Cerwin-Vega XED4004D with Belva 4 Gauge Amp Kit

400W Peak (360W RMS) XED Series Class-D 4-Channel Amplifier

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Cerwin-Vega XED4004D with Belva 4 Gauge Amp Kit

400W Peak (360W RMS) XED Series Class-D 4-Channel Amplifier

• 60 watts x 4 channel @ 4 ohm
• 90 watts x 4 channel @ 2 ohm
• Bridged: 170 watts x 2 channel @ 4 ohm
• Total RMS Power: 360 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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JBL DSP4086 (DSP 4086) + Amp Kit

8-Channel Class D Amplifier Design with Digital Signal Processing + NVX Premium 8 Gauge Amp Wiring Kit

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JBL DSP4086 (DSP 4086) + Amp Kit

8-Channel Class D Amplifier Design with Digital Signal Processing + NVX Premium 8 Gauge Amp Wiring Kit

• 40 Watts RMS x 8 @ 4 ohm
• 60 Watts RMS x 8 @ 2 ohm
• Total Peak Power: 1000 Watts
• CEA-2006 Compliant
• Frequency Response:10Hz to 22kHz

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• 40 Watts RMS x 8 @ 4 ohm
• 60 Watts RMS x 8 @ 2 ohm
• Total Peak Power: 1000 Watts
• CEA-2006 Compliant
• Frequency Response:10Hz to 22kHz

NVX NBA201 with Amplifier Wiring Kit

1400W Peak (700W) RMS N-Series Class A/B 2-Channel Amplifier

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NVX NBA201 with Amplifier Wiring Kit

1400W Peak (700W) RMS N-Series Class A/B 2-Channel Amplifier

• 200 watts x 2 channel @ 4 ohm
• 350 watts x 2 channel @ 2 ohm
• Bridged: 1400 watts x 1 channel @ 4 ohm
• Total RMS Power: 700 watts
• CEA-2006 Compliant
• Includes Amplifier Wiring Kit

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• 200 watts x 2 channel @ 4 ohm
• 350 watts x 2 channel @ 2 ohm
• Bridged: 1400 watts x 1 channel @ 4 ohm
• Total RMS Power: 700 watts
• CEA-2006 Compliant
• Includes Amplifier Wiring Kit

Hertz HCP2 + Belva BAK42

400W Class AB 2-Channel Car Audio Subwoofer Amplifier + Belva 4 Gauge Amp Wiring kit

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Hertz HCP2 + Belva BAK42

400W Class AB 2-Channel Car Audio Subwoofer Amplifier + Belva 4 Gauge Amp Wiring kit

• 65 Watts RMS x 2 @ 4 ohm
• 100 Watts RMS x 2 @ 2 ohm
• CEA-2006 Compliant
• Refined Heatsink with High Convection Capability
• Automatic Remote Turn-On/Off function
• Dimensions: 8.46" x 7.48" x 1.97"

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

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

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DS18 SXE-1200.4/RD (Red) 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: @ 4 ohm
• Total RMS Power: 400 watts
• Class A/B 2 ohm Stable 4-Channel-Channel Amplifier (Red)
• Includes Amplifier Wiring Kit

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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

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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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Pioneer GM-D9701 with Amplifier Wiring Kit

1200W RMS Class D Monoblock Amplifier w/ Wired Bass Boost Remote

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Pioneer GM-D9701 with Amplifier Wiring Kit

1200W RMS Class D Monoblock Amplifier w/ Wired Bass Boost Remote

• RMS: 500W x 1 @ 4 ohm, 800W x 1 @ 2 ohm, 1200W x 1 @ 1 ohm
• Total Peak Power: 2400W
• CEA-2006 Compliant
• Variable Bass Boost: 0 to +18 dB
• Class D Circuitry
• Includes Amplifier Wiring Kit
• Dimensions: 12-3/8"W x 7-7/8"D x 2-3/8"H

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Alpine S2-A55V with Amplifier Wiring Kit

540W RMS S-Series Class-D 5-Channel Amplifier + NVX 4 Gauge 6-Channel Wiring Kit

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Alpine S2-A55V with Amplifier Wiring Kit

540W RMS S-Series Class-D 5-Channel Amplifier + NVX 4 Gauge 6-Channel Wiring Kit

• 40 watts x 4 channel + 200 watts x 1 channel @ 4 ohm
• 60 watts x 4 channel + 300 watts x 1 channel @ 2 ohm
• Bridged: 120 watts x 2 channel @ 4 ohm + 300 watts x 1 channel @ 2 ohm
• Total RMS Power: 540 watts
• Class D 2 ohm Stable 5-Channel-Channel Amplifier

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Car Amplifier Packages & Bundles for your 2011 S40

Your Vehicle

Product results for your vehicle – confirm details to verify fitment.

Shop the Category

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

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

NVX Audio Upgrade Kit – QB12SPA with 2 Pair 6.5" Speakers

NVX Audio Upgrade Kit – QB12SPA with 2 Pair 6.5" Speakers

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

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

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

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

DS18 SMD-5000.1D + NVX Amp Kit + Capacitor

DS18 SMD-5000.1D + NVX Amp Kit + Capacitor

Audio Control LC-5.1300 with NVX 4 Gauge Amp Kit

Audio Control LC-5.1300 with NVX 4 Gauge Amp Kit

Rockford Fosgate Punch PM1000X5 with Amplifier Wiring Kit

Rockford Fosgate Punch PM1000X5 with Amplifier Wiring Kit

Kenwood KAC-D3104 with Amplifier Wiring Kit

Kenwood KAC-D3104 with Amplifier Wiring Kit

Rockford Fosgate Prime R500X1D 500W RMS Mono Class D Amplifier + Amp Kit + Cap

Rockford Fosgate Prime R500X1D 500W RMS Mono Class D Amplifier + Amp Kit + Cap

Crunch GP-1500.1 Amplifier + Free Amp Wiring Kit

Crunch GP-1500.1 Amplifier + Free Amp Wiring Kit

NVX VAD17001 with Amplifier Wiring Kit

NVX VAD17001 with Amplifier Wiring Kit

Cerwin-Vega XED4004D with Belva 4 Gauge Amp Kit

Cerwin-Vega XED4004D with Belva 4 Gauge Amp Kit

JBL DSP4086 (DSP 4086) + Amp Kit

JBL DSP4086 (DSP 4086) + Amp Kit

NVX NBA201 with Amplifier Wiring Kit

NVX NBA201 with Amplifier Wiring Kit

Hertz HCP2 + Belva BAK42

Hertz HCP2 + Belva BAK42

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

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

NVX VCW84v3 + NDA12001 + XKIT42

NVX VCW84v3 + NDA12001 + XKIT42

Pioneer GM-D9701 with Amplifier Wiring Kit

Pioneer GM-D9701 with Amplifier Wiring Kit

Alpine S2-A55V with Amplifier Wiring Kit

Alpine S2-A55V with Amplifier Wiring Kit

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