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MB Quart NAU 260

360W Max, Nautic Series 2-Channel Marine Amplifier (NAU 260, NAU-260)

Discontinued
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This item has been discontinued

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  • Nautic Series 2-Channel Class A/B Marine Amplifier
  • RMS Power Rating:
    • 4 ohms: 60 watts x 2 chan.
    • 2 ohms: 90 watts x 2 chan.
    • Bridged, 4 ohms: 180 watts x 1 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: 7-7/8"L x 9-1/2"W x 2-1/8"H
  • 8-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 2 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 2 channels
RMS Power @ 1 ohm

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 1 ohm, 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.

Not Stable
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 1 channels
Peak Power Output
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison.

Not Specified

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.
2
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.

180 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.
15A 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
60%
4 Star
30%
3 Star
0%
2 Star
10%
1 Star
0%

Average Attribution Rating

Durability
4.6
Value
4.6
Features
4.4
Design
4.9
Usability
4.6
Sandman

Harleyville SC

Overall
Durability
Value
Features
Design
Usability
MB Quart NAU 260

February 18, 2013

I am so very good for great phones amps Vernie design

0 of 0 found this helpful

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Sandman

Harleyville SC

Overall
Durability
Value
Features
Design
Usability
MB Quart NAU 260

February 18, 2013

I am so very good for great phones amps Vernie design

0 of 0 found this helpful

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Bjorn

Canada

Overall
Durability
Value
Features
Design
Usability
Im Impressed

November 28, 2012

This little amp rocks, I have really tested this amp to the limit and it still does the same thing it did when I bought it. I use it a lot for all my out-door fun in rain or shine..

0 of 0 found this helpful

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Aus10c

Fort Worth, TX

Overall
Durability
Value
Features
Design
Usability
Ok Amp

October 15, 2012

Rating is 260 watts. Probably putting out about 150. My intent was to put this in my boat to power two coaxial speakers but it would not power them. Had to go with a bigger amp.

0 of 0 found this helpful

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bikegide2000

Japan

Overall
Durability
Value
Features
Design
Usability
It is a very good product!

January 3, 2012

I use it for the subwoofer of the ship, and thank you!

0 of 0 found this helpful

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Steven

Kennesaw, GA

Overall
Durability
Value
Features
Design
Usability
Works Great

December 2, 2011

Had this in my boat for 2 years. No issues. Works perfect.

0 of 0 found this helpful

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mando

miami ,fl

Overall
Durability
Value
Features
Design
Usability
great amp

April 3, 2011

i build custom cars and harleys i bought this for a friend/customer for his 2007 roadking ,i needed an amp that was clean in looks and sound and marine proof (we live in miami fl.) anyways its all that i asked for and a great price ,we have played it for hours and hours not one glitch and you figure this is a show bike mostly so its parked with music on pretty loud for long periods of time, anyways yes i would buy another with out hesitation .....................

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Sam

Tulsa Ok

Overall
Durability
Value
Features
Design
Usability
Great Amp for the price.

November 7, 2010

I bought this amp and installed it in my boat to power Two speakers on my wakeboard tower. Great power for the price.

0 of 0 found this helpful

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Karen

Ogden, UT

Overall
Durability
Value
Features
Design
Usability
Well worth the $$$!

January 11, 2010

Used this amp in my Yamaha Rhino to hook in my Ipod. Works great, withstands the elements too. Will put same/similar setup in my Polaris RZR.

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Stevolibido

Houston, TX

Overall
Durability
Value
Features
Design
Usability
high end, low price

October 18, 2009

The MB Quart NAU 260 packs extreme performance and features in a very low cost package. Why pay more? You could spend tons more but the difference wouldn't be worth it.

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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

Monster Cable BAP300

8 Gauge Amplifier Installation Power Kit (No RCA Interconnects)

Your Price $44.95

NVX V Series RCA Audio Interconnect Cable

V-Series: 5m (16.40 ft) 2-Channel RCA Audio Interconnect Cable

Your Price $11.99

Kicker KI24 K-Series RCA Audio Interconnect Cable

4 Meters (13 ft.) 2-Channel K-Series RCA Audio Interconnect Cable

Your Price $16.95

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

NAU260

UPC

806576215844

Weight

6.50lbs

Internal SKU

nau260

Internal Product ID

17757

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 260