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MB Quart NAU 460

360W Max, Nautic Series 4-Channel Marine Amplifier

Discontinued
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This item has been discontinued

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Seafaring Power

For those who have been involved with car audio in the last few year, you will recognize the name MB Quart. MB Quart has been a leading car audio company for many years and now the experience and quality of MB Quart has found its way to marine audio. One of the best way to improve your audio system is by upgrading your speakers. However upgraded speakers usually need a higher source of power to function correctly, enter MB Qaurt's NAU 460 4-channel Nautic series marine amplifier. This amplifier is perfect for anyone looking to amplify a set or two of speakers or even some entry level subwoofers at the bridged impedance. Equipped with UV and salt water resistant paint, silk screen, and heat sink enclosure will improve the life span of this amplifier by protecting it from any weather conditions. The non-corrosive aluminum casing will keep your amplifier looking nice for years to come. Variable high and low pass crossovers will give you complete control of all frequencies to better tune your system to your personal preferences. The amplifier conforms to the American Boat and Yacht Council(ABYC) marine electronic standards giving you a safe and reliable product. So if you are looking to amplify your audio system to get the best sound possible, then look no further than the MB Quart NAU 460 4-channel amplifier.

  • Nautic Series 4-Channel Class A/B Marine Amplifier
  • RMS Power Rating:
    • 4 ohms: 60 watts x 4 chan.
    • 2 ohms: 90 watts x 4 chan.
    • Bridged, 4 ohms: 180 watts x 2 chan.
  • MOSFET PWM power supply
  • UV and salt water resistant paint, silk screen and heat sink enclosure
  • Marine-grade conformal coated circuit boards resist corrosion from salt spray and moisture
  • Non-corrosive brushed aluminum casing
  • Conforms to the American Boat and Yacht Council (ABYC) marine electronic standards
  • LED power and protect indicators
  • Bass Boost (0-6 dB bass boost at 45 Hz)
  • 2/1 channel operation
  • Full range line outputs
  • 4-Way system protection circuitry (DC, short, thermal, overload)
  • Heavy duty aluminum alloy heatsink
  • Gold-plated RCA level inputs
  • Gold-plated screw terminals
  • Variable high-pass filter (40-250 Hz)
  • Variable low-pass filter (40-250 Hz)
  • Variable frequency: 40-250 Hz
  • Variable input level control (0.2V-6V)
  • Damping Factor: 180
  • Dimensions: 12-5/8"L x 9-1/2"W x 2-1/8"H
  • 4-gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits when purchased together with this amplifier.
  • 1-year SonicElectronix.com warranty

Power Specifications - Full Range Channels

RMS Power @ 4 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

60 watts x 4 channels
RMS Power @ 2 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

90 watts x 4 channels
Bridged RMS Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the RMS power created once an amplifier is bridged.

180 watts x 2 channels

Amplifier Specifications

Marine Certified
Marine certified means that the unit has been designed and manufactured with a marine use in mind. It will withstand the harsh conditions that come from marine use. Generally, they are treated against UV rays and treated with special protective coatings.
Yes
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.

AB
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.
4
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.

360 watts
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.
8 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
4 ohms
THD at Rated RMS Power
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
.05%
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.
No
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
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.

Low-pass (LP)
High-pass (HP)
Full (AP)
High-Pass Crossover Frequency
The high-pass crossover frequency can be a fixed crossover point or a variable crossover range. A variable high-pass crossover allows you to select a specific crossover point which allows frequencies above the set crossover point to pass, while making frequencies below the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

40 - 250 Hz
Low-Pass Crossover Frequency
The low-pass crossover frequency is typically used for subwoofers. It can be a fixed crossover point or a variable crossover range. A variable low-pass crossover allows you to select a specific crossover point which allows frequencies below the set crossover point to pass, while making frequencies above the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

40 - 250 Hz
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
93 dB
Channel Separation
Also referred to as crosstalk. The amount of interference on one stereo channel caused by the leaking of the other stereo channel. The higher the rating in decibels (dB), the better the Channel Separation.
80 dB
Bass Boost
The objective of the bass boost is to get more kick out of your subwoofer. It is a circuit that emphasizes the lower frequencies at a given point. The bass boost should always be set first before setting the gain. This feature is known for destroying subwoofers and is commonly used incorrectly, so be cautious.
0 - 6 dB
Bass/Gain Remote
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.
No
Fan Cooled
A great feature to have if an amp generates a large amount of heat. Cooling fans can help regulate the temperature to prevent the amp from overheating (burning).
No
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
25A x 2 
CEA-2006 Compliant
Amplifiers that have been tested to meet specific standards. When a car amplifier meets these standards, you can be sure that it will be able to produce the amount of power specified by the official CEA-2006 rating. Usually, these rating consist of the following items:
  • RMS Power
  • Signal-to-Noise Ratio

This rating applies to both external car amplifiers, as well as the amplifiers inside of in-dash stereos.

No

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
86%
4 Star
9%
3 Star
0%
2 Star
5%
1 Star
0%

Average Attribution Rating

Durability
4.5
Value
5.0
Features
4.7
Design
4.7
Usability
4.8
canyoun

lancaster, CA

Overall
Durability
Value
Features
Design
Usability
good amp

July 18, 2013

I've had this amp a couple months now and works very well. It has a good, clean sound and is powerful enough for my needs. The amp doesn't get really hot, even in this summer heat. Easy to install and would recommend for those on a budget.

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Roy

Huntingdon, PA

Overall
Durability
Value
Features
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Usability
mb quart nau 460

November 8, 2012

Excellent sound and volume, replaced my failed amp on my 20ft center console Triumph boat. Better clarity and volume, for less money than my original amp.

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Dan

Clarksville, IA

Overall
Durability
Value
Features
Design
Usability
Great Value!

October 11, 2012

Purchased this 6 months ago for my pontoon. With the assistance of my helpful Sonic Elec. rep I went with the Clarion deck, 2 MB quart marine amps, 2 pair of MB Quart 6.5's & 2 - 10" MB quart subs... this baby jams. No issues thus far, very happy with my purchase.

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Keith

Hollywood Florida

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Value
Features
Design
Usability
Great product!

September 10, 2012

I purchased two of them to use as an amp for my door mid's and highs in two different vehicles. They work awesome. A great amp,no distortion or clipping. Tried to use it bridged for a 12" infinity but got shut off on thermal after 20 minutes of excision. All and all a great amp would recommend to anyone. great product!

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Ron

Ponca City, OK

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Value
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Usability
Great Product

June 3, 2012

I was hesitant to buy this product as well as the NAU 660 that I bought at the same time. I knew MB Quart was a solid speaker company, but was not familiar with their amps. I bought these two amps to drive 10 seperate Polk Audio speakers in my boat (six in the boat, 4 on wakeboard tower), driven by an Alpine head deck. All I can say is WOW! I can run my system at Volume level 31 out of 35 with no detectable distortion and solid quality sound. I have had my boat out probably 20-25 times since the install and have not gone easy on the amps, so far they are still performing perfectly. The only issue I had on the install, was the speaker connection configuration is different between the 460 and 660, so if you happen to get one of each pay extra attention to the wiring diagram. I am one very pleased customer, and already have recommmended these amps to friends (who love the way my system sounds). I might add, I buy many products off of the internet and reviewing these two products are the first time I have taken the time to write reviews, only because of how impressed I have been with the products.

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Offshore Rafting

Arapahoe

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Durability
Value
Features
Design
Usability
Offshorerafting.com

April 2, 2012

I would recommend the MBquart marine amp because it delivered even better power then my JBL. It's a great value as it's low price compared to many other marine amps. Go for it you will be happy you did, then crank it up!

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McLovin

Orlando, FL

Overall
Durability
Value
Features
Design
Usability
THE best marine amp around.

March 11, 2012

In my 18' bowrider I'm currently running 4 of these amps to 12 Infinity 6x9s and 4 Polk 4". Let me tell you.. these things are INCREDIBLE. Hands down the best marine 4 channel amp that you can buy. I have people telling me that they can literally hear me over a mile away with perfect distortion free sound. Amps barely get warm to the touch. Totally flawless, crisp, perfect sound. Getting ready to add a 5th to run 2 - 10" Bazooka marine subs.

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Cody

Canada

Overall
Durability
Value
Features
Design
Usability
MB Quart NAU 460

February 28, 2012

Purchased this 4 channel amp last summer. Installed in my 18.5 ft legend fishing boat. I have it feeding a set of MB Quart 6x9's and 6.5's. Sounds really crisp and tight. Lots of clean volume when needed. I did need to return the first amp as it arrived with a bad chanel, but Sonic acted quickly to rectify the problem. I am happy with the set up.

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acwisn

WI

Overall
Durability
Value
Features
Design
Usability
So far so good

January 19, 2012

Bought the NAU 460 to replace a Jensen 760 amp in my 20 foot runabout boat. The Jensen died about 2 months after its one-year warranty! The NAU 460 appears well built and sounds very good for its price. It survived its first summer boating season, which is when it's driven in 90+ ambient temps and humid (but minimal direct water contact) conditions. The only reason I am giving it only 4 stars for overall and durability is that I've only had it for 6 months so far. We'll see how long this one lasts.

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tbrat44

saukville,wi

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Value
Features
Design
Usability
nau460, quality value..

January 14, 2012

Basically purchased the NAU460 with the advice from a friend. The amp has worked perfectly. If I need another one some day, I will most certainly purchase another one of these!!!

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Nick

Springfield, MO

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Value
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Review of the MB Quart NAU 460

December 30, 2011

I bought this amp b/c it was a good brand, with great reviews and perfect for the application. It fit perfectly in the space it was bought for and supplies awesome power to the JL Audio MX 650's. It saw heavy use right after it was installed and powered up. It hasn't overheated or had any issues at all. To say I am happy with this amp is an understatement. So far, it has been flawless. I'll see how it did being outside all winter and how it handles being heavily used on the boat this season.

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Tom

Lilburn, GA

Overall
Durability
Value
Features
Design
Usability
Good Stuff

November 4, 2011

Put this in my 1967 British Roadster before a long road trip, it rained the last 10 hours of the return trip (Irene). This amp sat in a puddle about 2" deep and never missed a beat. It came through the soaking better than I did.

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JCB2

Mobile, AL

Overall
Durability
Value
Features
Design
Usability
Great amp!

November 3, 2011

I have only had the amp for a few months but it sounds and performs great. I don't know why anyone would spend 2-3 times as much on other amps that are rated the same.

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Valeriu

Tampa, FL

Overall
Durability
Value
Features
Design
Usability
Very good buy

September 29, 2011

Installed it in the boat pushing 1 10" marine bazooka. 2 8's Rockford fosgate sounds great I am impressed, Good product.

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Conrad

Canada

Overall
Durability
Value
Features
Design
Usability
mediocre

August 29, 2011

Bought this amp to power a set of Rockford component speakers and bridged two channels to power a Rockford sub. All this is in my 19' bow rider. The amp sounds good and I had no issues with it when first installed. It's getting to the end of it's first season and I am starting to have overheating issues. I'll let it cool down and it turns back on but then a few songs later it'll power down again. Debating on what to buy to replace it. I guess you get what you pay for.

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jak

Australia

Overall
Durability
Value
Features
Design
Usability
Decent amp

June 30, 2011

Used in a car running 4 mb quart speakers, although this is a marine amplifier. Performed fine, no overheating problems.

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darrin

johnstown, OH

Overall
Durability
Value
Features
Design
Usability
nice product

June 27, 2011

The MB Quart in my view is a well priced item. The amp makes a great addition to the system.

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Craig

Gray, LA

Overall
Durability
Value
Features
Design
Usability
nice

May 9, 2011

This amp is very affordable with a good clear sound and it runs cool i have it mounted in my console and worried it would over heat, so far so good.

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Steve

Berlin, CT

Overall
Durability
Value
Features
Design
Usability
Good value

March 29, 2011

Installed easy, much like any other amp. It currently runs 4 JL Audio 7.7" components on the deck of my boat. I paired it with an MB Quartz head unit and it sounds great. It does what it should and doesn't cost a bunch of money, not much else to say.

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Jason H

Charleston, sc

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Value
Features
Design
Usability
Great amp at a great price

November 6, 2010

I have a 26 foot Sea Ray bowrider and installed two of these amps with Polk db series speakers. I replaced the crap stock clarion amps and speakers that only lasted 3 years. I LOVE THIS AMP!! Its sounds great with the Polk's. Don't be scared by the price.

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Accessory Tools and Products

Accessories added

Stinger SK4681

8 Gauge 4000 Series Complete Amplifier Wiring Kit

Your Price $39.99

Belva BAK82

8 Gauge Amplifier Installation Kit with 2-Channel RCA Interconnects

Your Price $17.99

Kicker K-Series RCA Interconnect Cable

19 ft. of 4-Channel RCA cable with dual twisted-pair conductors, hyper-flex technology, and gold plated contacts for maximum signal transfer!

Your Price $29.95

Kicker 4-Channel RCA Audio Interconnect Cable

4 Meters (13 ft.) 4-Channel K-Series RCA Audio Interconnect Cable

Your Price $19.95

StreetWires ZN7 RCA Interconnect Cable

16.4 ft. of 4-Channel RCA Cable with hyper twist construction, oxygen free copper, and precision machined tips.

Your Price $59.99

StreetWires SCP1215BL - 12 AWG Speaker Wire

12 Gauge Wire - 15 ft. of Speaker Cable with Twisted Construction

Your Price $24.95

StreetWires FB8

8 Gauge Firewall Bushing

Your Price $6.95

Car/Marine Audio Installation Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $12.99

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Product Summary

Manufacturer

Model Number

NAU460

UPC

806576215851

Weight

10.00lbs

Internal SKU

nau460

Internal Product ID

17758

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: MB Quart NAU 460