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.

5-Channel (4)

1 - Monoblock (2)

2-Channel (2)

4-Channel (2)

6-Channel (1)

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.

Bass Boost (6)

Compact Design (3)

Speaker Level Inputs (3)

Weather-Resistant (8)

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.

D (8)

AB / D (1)

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 250 watts (7)

250–500 watts (1)

500–1,000 watts (3)

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 500 watts (9)

500–1,000 watts (2)

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.

Nautic Series (4)

Discus Series (3)

NA2 Series (1)

Minimum Impedance Unbridged

The lowest impedance the amplifier will handle when it is not bridged.

2 (7)

1 (3)

Minimum Impedance Bridged

The lowest impedance the amplifier will handle when it is bridged.

4 ohms (5)

2 ohms (1)

Not Bridgeable (1)

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 (5)

No (3)

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.

Not Tested (3)

Yes (1)

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.

No (6)

1 pair (2)

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.

High-Pass (HP) (6)

Low-Pass (LP) (8)

Subsonic (4)

Amp Bluetooth Connectivity

This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.

No (5)

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MB Quart NA2-400.2

400W Peak NA2 Series Class-D 2-Channel 2-Ohm Stable Amplifier

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MB Quart NA2-400.2

400W Peak NA2 Series Class-D 2-Channel 2-Ohm Stable Amplifier

• 100 Watts RMS x 2 @ 4 ohm
• 200 Watts RMS x 2 @ 2 ohm
• Total Peak Power: 400 Watts
• Marine and Powersports Certified
• Built-In Low-Pass and Hi-Pass Filters
• Aluminum Heatsink
• Dimensions: 3.7" W x 5.51" L x 1.77"

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MB Quart NA2-400.1

400W Peak NA2 Series Class-D Monoblock 2-Ohm Compact Marine Amplifier

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MB Quart NA2-400.1

400W Peak NA2 Series Class-D Monoblock 2-Ohm Compact Marine Amplifier

• 200 Watts RMS x 1 @ 4 ohm
• 400 Watts RMS x 1 @ 2 ohm
• Total Peak Power: 400 Watts
• Marine and Powersports Certified
• Built-In Low-Pass and Subsonic Filters
• 0 - +12 Bass Boost
• Aluminum Heatsink
• Dimensions: 3.7" W x 5.51" L x 1.77"

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MB Quart NA2-500.5

500W Peak NA2 Series Class-D 5-Channel 2-Ohm Stable Powersports Amplifier

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MB Quart NA2-500.5

500W Peak NA2 Series Class-D 5-Channel 2-Ohm Stable Powersports Amplifier

• 40 watts x 4 chan., 100 watts x 1 chan. @ 4 ohm
• 80 watts x 4 chan., 200 watts x 1 chan. @ 2 ohm
• Total Peak Power: 500 Watts
• Marine and Powersports Certified
• Built-In Low-Pass and Subsonic Filters
• Aluminum Heatsink
• Dimensions: 3.7" W x 8.46" L x 1.77"

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MB Quart NA2-320.4

320W Peak NA2 Series Class-D 4-Channel 2 ohm Stable Amplifier

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MB Quart NA2-320.4

320W Peak NA2 Series Class-D 4-Channel 2 ohm Stable Amplifier

• 40 watts RMS x 4 @ 4 ohm
• 80 watts RMS x 4 @ 2 ohm
• 320 watts Total Power
• Switchable High-Pass Filters
• 0-12dB Boost
• Aluminum Heatsink
• Dimensions: 3.7" W x 5.51" L x 1.77" H

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• 40 watts RMS x 4 @ 4 ohm
• 80 watts RMS x 4 @ 2 ohm
• 320 watts Total Power
• Switchable High-Pass Filters
• 0-12dB Boost
• Aluminum Heatsink
• Dimensions: 3.7" W x 5.51" L x 1.77" H

MB Quart NA3-750.1

750W RMS Class D Nautic Series Monoblock Marine Amplifier with Bass Remote

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MB Quart NA3-750.1

750W RMS Class D Nautic Series Monoblock Marine Amplifier with Bass Remote

• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• 750 watts x 1 channel @ 1 ohm
• Total RMS Power: 750 watts
• Class D 1 ohm Stable Monoblock Amplifier

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• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• 750 watts x 1 channel @ 1 ohm
• Total RMS Power: 750 watts
• Class D 1 ohm Stable Monoblock Amplifier

MB Quart NA3-1000.5 (Open Box, Good)

Nautic Marine 1000 Watt 5 Channel Marine Amplifier with Bass Remote

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MB Quart NA3-1000.5 (Open Box, Good)

Nautic Marine 1000 Watt 5 Channel Marine Amplifier with Bass Remote

• 75 Watts Peak x 4 + 100 Watts x 1 @ 4 ohm
• 150 Watts Peak x 4 + 200 Watts x 1 @ 2 ohm
• Total Peak Power: 1000 Watts
• CEA-2006 Compliant
• NMMA Certified
• Audiophile Marine Standard
• LED system protection circuit diagnostics
• Class SQ & Class Q1

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MB Quart DA2-500.5D

500W Peak Class D Discus Series 5-Channel Marine and Powersports Amplifier

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MB Quart DA2-500.5D

500W Peak Class D Discus Series 5-Channel Marine and Powersports Amplifier

• 35 watts x 4 channel + 150 watts x 1 channel @ 4 ohm
• 50 watts x 4 channel + 225 watts x 1 channel @ 2 ohm
• 350 watts x 1 channel @ 1 ohm
• Bridged: 100 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 1 ohm Stable 5-Channel Amplifier

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MB Quart DA2-520.4D

520W Peak Class D Discus Series 4-Channel Marine and Powersports Amplifier

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MB Quart DA2-520.4D

520W Peak Class D Discus Series 4-Channel Marine and Powersports Amplifier

• 90 watts x 4 channel @ 4 ohm
• 130 watts x 4 channel @ 2 ohm
• Bridged: 260 watts x 2 channel @ 4 ohm
• Total RMS Power: 520 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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• 90 watts x 4 channel @ 4 ohm
• 130 watts x 4 channel @ 2 ohm
• Bridged: 260 watts x 2 channel @ 4 ohm
• Total RMS Power: 520 watts
• Class D 2 ohm Stable 4-Channel Amplifier

MB Quart DA2-500.2D

500W Peak Class D Discus Series 2-Channel Marine and Powersports Amplifier

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MB Quart DA2-500.2D

500W Peak Class D Discus Series 2-Channel Marine and Powersports Amplifier

• 150 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 1 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel Amplifier

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• 150 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 1 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel Amplifier

MB Quart NA3-600.6

Nautic Marine 600 Watt 6 Channel Marine Amplifier

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MB Quart NA3-600.6

Nautic Marine 600 Watt 6 Channel Marine Amplifier

• 50 Watts Peak x 6
• 100 Watts Peak x 6 @ 2 ohm
• Total Peak Power: 600 Watts
• CEA-2006 Compliant
• NMMA Certified
• Audiophile Marine Standard
• LED system protection circuit diagnostics
• Class SQ

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MB Quart NA710.5 (Like New (Open Box))

360W RMS 5-Channel Nautical Series Class SQ Marine Amplifier

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MB Quart NA710.5 (Like New (Open Box))

360W RMS 5-Channel Nautical Series Class SQ Marine Amplifier

• Full-Range RMS: 60W x 4 @ 4 ohm, 90W x 4 @ 2 ohm
• Subwoofer RMS: 200W x 1 @ 4 ohm, 350W x 1 @ 2 ohm
• Marine Ready
• Raven Black Finish
• Preamp RCA Outputs
• Dimensions: 9-1/2"W x 18"L x 2-1/4"H

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MB Quart Marine Amplifiers for Boats

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MB Quart NA2-400.2

MB Quart NA2-400.2

MB Quart NA2-400.1

MB Quart NA2-400.1

MB Quart NA2-500.5

MB Quart NA2-500.5

MB Quart NA2-320.4

MB Quart NA2-320.4

MB Quart NA3-750.1

MB Quart NA3-750.1

MB Quart NA3-1000.5 (Open Box, Good)

MB Quart NA3-1000.5 (Open Box, Good)

MB Quart DA2-500.5D

MB Quart DA2-500.5D

MB Quart DA2-520.4D

MB Quart DA2-520.4D

MB Quart DA2-500.2D

MB Quart DA2-500.2D

MB Quart NA3-600.6

MB Quart NA3-600.6

MB Quart NA710.5 (Like New (Open Box))

MB Quart NA710.5 (Like New (Open Box))

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MB Quart NA2-400.2

MB Quart NA2-400.2

MB Quart NA2-400.1

MB Quart NA2-400.1

MB Quart NA2-500.5

MB Quart NA2-500.5

MB Quart NA2-320.4

MB Quart NA2-320.4

MB Quart NA3-750.1

MB Quart NA3-750.1

MB Quart NA3-1000.5 (Open Box, Good)

MB Quart NA3-1000.5 (Open Box, Good)

MB Quart DA2-500.5D

MB Quart DA2-500.5D

MB Quart DA2-520.4D

MB Quart DA2-520.4D

MB Quart DA2-500.2D

MB Quart DA2-500.2D

MB Quart NA3-600.6

MB Quart NA3-600.6

MB Quart NA710.5 (Like New (Open Box))

MB Quart NA710.5 (Like New (Open Box))

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