Year-End SaleEnds 1/1/26. Limited quantities. No rainchecks.

Skip to content
Cart
Main Content
product image
MB Quart

MB Quart - Nautic Class AB Bridgeable Multichannel MOSFET Amplifier with Variable Crossovers - Gray

Model: NA540.6
SKU: 4400229
This item is no longer available in new condition. See similar items below
  • Key Specs
    • Continuous Watts x Channel @ Ohms: 60 W x 6 x 4 Ohms; 90 W x 6 x 2 Ohms; 180 W x 3 x 4 Ohms
    • Maximum Watts x Channel @ Ohms: 90X6X4 (This is the maximum load the speaker, subwoofer or amp can drive.)
    • Amplifier Class: AB (An amplifier's mode of operation, specifically the conditions in which its electrical current flows for the duration of an audio signal, determines its class. Each class has its strengths and weaknesses when it comes to power efficiency, levels of crossover distortion, and overall sound quality.)
    • Number Of Channels: 6
    • Bass Boost: Variable (Circuitry that boosts the bass response of the amplifier, improving audio reproduction enhancing the sound of low frequencies. Fixed boost means the level of bass response is preset, whereas variable boost allows the user to make adjustments.)
    • Bridgeable: true (Bridging an amplifier increases the power it supplies to the speaker(s).)
    • Low-Pass Crossover: Variable (Devices with this function allow only audio frequencies below a chosen cut-off frequency to pass through to a speaker or sound system. A device may have a cut-off frequency predetermined by its manufacturer (fixed), multiple cut-off frequency options to choose from (selectable), or have the capability for the frequency to be configured by the user (variable).)
    • High-Pass Crossover: Variable (Devices with this function allow only audio frequencies above a chosen cut-off frequency to pass through to a speaker or sound system. A device may have a cut-off frequency predetermined by its manufacturer (fixed), multiple cut-off frequency options to choose from (selectable), or have the capability for the frequency to be configured by the user (variable).)
    • Speaker-Level Inputs: true (Also referred to as high-level inputs. Enables the amplifier to receive a sound signal from another device that does not have RCA, or low-level, inputs.)
  • General
    • Brand: MB Quart
    • Model Number: NA540.6
    • Product Name: Nautic Class AB Bridgeable Multichannel MOSFET Amplifier with Variable Crossovers
    • Color: Gray
    • Mounting Hardware Included: false
  • Audio Power
    • Continuous Watts x Channel @ Ohms: 60 W x 6 x 4 Ohms; 90 W x 6 x 2 Ohms; 180 W x 3 x 4 Ohms
    • Maximum Watts x Channel @ Ohms: 90X6X4 (This is the maximum load the speaker, subwoofer or amp can drive.)
    • Total Power Handling Maximum: 90 watts
    • Watts Per Channel Maximum: 180 watts
    • Amplifier Class: AB (An amplifier's mode of operation, specifically the conditions in which its electrical current flows for the duration of an audio signal, determines its class. Each class has its strengths and weaknesses when it comes to power efficiency, levels of crossover distortion, and overall sound quality.)
  • Audio
    • Number Of Channels: 6
    • Minimum Frequency Response: 10 hertz (Describes the maximum range of frequencies or musical tones a product can reproduce, from very low tones to very high treble tones. The minimum frequency or musical tone the speaker can reproduce. High treble tones have higher frequencies while low tones and deep bass have lower frequencies.)
    • Maximum Frequency Response: 45 kilohertz (Describes the maximum range of frequencies or musical tones a product can reproduce, from very low tones to very high treble tones. The maximum frequency or musical tone the speaker can reproduce. High treble tones have higher frequencies while low tones and deep bass have lower frequencies.)
    • Total Harmonic Distortion: 0.05 percent (Measurement of the harmonic sound distortion. The lower the percentage, the cleaner the sound.)
    • Signal-to-Noise Ratio (SNR): 93 decibels (The ratio of the desired signal's strength to the level of background noise. A ratio higher than 1:1, which equates to greater than 0 decibels, indicates more signal than noise.)
    • Bass Boost: Variable (Circuitry that boosts the bass response of the amplifier, improving audio reproduction enhancing the sound of low frequencies. Fixed boost means the level of bass response is preset, whereas variable boost allows the user to make adjustments.)
  • Features
    • Bridgeable: true (Bridging an amplifier increases the power it supplies to the speaker(s).)
    • Low-Pass Crossover: Variable (Devices with this function allow only audio frequencies below a chosen cut-off frequency to pass through to a speaker or sound system. A device may have a cut-off frequency predetermined by its manufacturer (fixed), multiple cut-off frequency options to choose from (selectable), or have the capability for the frequency to be configured by the user (variable).)
    • High-Pass Crossover: Variable (Devices with this function allow only audio frequencies above a chosen cut-off frequency to pass through to a speaker or sound system. A device may have a cut-off frequency predetermined by its manufacturer (fixed), multiple cut-off frequency options to choose from (selectable), or have the capability for the frequency to be configured by the user (variable).)
    • MOSFET Power Supply: true (A specific type of power supply with the advantages of high switching speed and efficiency at low voltages.)
    • Remote Control Included: No
    • Marine: false
  • Input
    • Line-Level Inputs: true (Also referred to as low-level inputs. Enables the amplifier to receive a sound signal from another device via RCA cables.)
    • Speaker-Level Inputs: true (Also referred to as high-level inputs. Enables the amplifier to receive a sound signal from another device that does not have RCA, or low-level, inputs.)
  • Output
    • Preamp Outputs: true
  • Dimensions
    • Product Height: 2.2 inches (The out of box height of the item. Height is measured as the vertical distance from the bottom of the item to the top as it would be primarily used or placed.)
    • Product Width: 9.4 inches (The out of box width of the item. Width is measured as the horizontal distance from one side of the item to the other as it would be primarily used or placed.)
    • Product Depth: 17.1 inches (The out of box depth of the item. Depth is measured as the distance from the front of the item to the back as it would be primarily used or placed.)
    • Product Weight: 11.09 pounds (The out of box weight of the item.)
  • Warranty
    • Warranty - Parts: 1 year
    • Warranty - Labor: 1 year
  • Compatibility
    • Voice Assistant Built-in: No (A digital assistant built into the device that uses voice commands to answer questions and control smart devices.)
  • Other
    • UPC: 806576221906

Deliver thumping bass and maximum sound while cruising the lake with this MBQuart nautical amplifier. Corrosion-resistant connections keep the amp securely attached to your radio, and the built-in diagnostics reduce distortion. This MBQuart nautical amplifier can also be used in a car or truck to boost sound for tailgate parties or joyriding.

  • 540W total power: RMS rating of 90W x 6 @ 2 ohms, 6 channels driven for robust audio.
  • Variable high- and low-pass crossovers: Ensure flexible operation.
  • 4 ohms impedance: Conducts power evenly to keep the speaker at an appropriate level.
  • 0.05% THD (Total Harmonic Distortion): Provides clean sound.
  • 93dB signal-to-noise ratio: Offers crisp audio.
  • 0-9dB bass boost: Lets you add punchy bass to your music.
  • MOSFET power supply: Delivers efficient performance.
  • 6-channel output: Allows easy system expansion.
  • Class AB circuitry: Ensures reliable power handling.
  • 540W total power: RMS rating of 90W x 6 @ 2 ohms, 6 channels driven for robust audio.
  • Variable high- and low-pass crossovers: Ensure flexible operation.
  • 4 ohms impedance: Conducts power evenly to keep the speaker at an appropriate level.
  • 0.05% THD (Total Harmonic Distortion): Provides clean sound.
  • 93dB signal-to-noise ratio: Offers crisp audio.
  • 0-9dB bass boost: Lets you add punchy bass to your music.
  • MOSFET power supply: Delivers efficient performance.
  • 6-channel output: Allows easy system expansion.
  • Class AB circuitry: Ensures reliable power handling.
Whats Included
  • MB QUART Nautic Class AB Bridgeable Multichannel MOSFET Amplifier with Variable Crossovers
  • MB QUART Nautic Class AB Bridgeable Multichannel MOSFET Amplifier with Variable Crossovers

Today's top picks

Sponsored