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MB Quart NA710.5

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

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List price $389.99

You Save: $200.04 (51.29%)

$189.95

with warranty

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Order within 14 hrs 2 mins to ship 11/26

Arrives by Wednesday, Dec. 3 to zip 07095

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Bundled Savings with this Product

=

40% off a 4 Gauge Amp Kit with Purchase

Save 40% off the NVX XKIT42 install kit, the perfect kit for this amp.

28.00

69264

424

MB Quart NA710.5

$189.95

+

40% OFF

NVX XKIT42

$69.99

Special Price $41.99 ($69.99 if purchased separately)

NVX XKIT42

• 4 Gauge 2-Channel X-Series Complete Amplifier Installation Kit
• For Car Audio Systems Up To 1000 Watts RMS
• Silver-Tinned 100% Virgin Copper
• 2-channel RCA Interconnect Cable

(Offer 1 of 1)

Combined Total Price

$231.94

You Save $28.00

General Features:

  • Nautical Series 5-Channel Class SQ Car Amplifier
  • Channel 1-4 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.
  • Subwoofer Channel RMS Power Rating:
    • 4 ohms: 200 watts x 1 chan.
    • 2 ohms: 350 watts x 1 chan.
  • Pulse Width Modulated MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Variable Bass Boost (0 to +10 dB bass boost at 45 Hz)
  • Soft start turn-on
  • 5/4/3/2 or Mono channel operation
  • Preamp RCA outputs to daisy chain multiple amps
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • Heavy duty aluminum alloy heat-sink
  • Input sensitivity:
    • Level: 200mV-6V
  • Variable high-pass filter (250-4000 Hz)
  • Variable low-pass filter (40-250 Hz)
  • 4 gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier.
  • Dimensions: 9-1/2"W x 18"L x 2-1/4"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Product History:

MB Quart NA710.5 thumbnail
(newest, current model)
(previous model, replaced by MB Quart NA710.5)

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

Power Specifications - Subwoofer Channel

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 speaker(s) or subwoofer(s) 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. The 5th channel on these particular amplifiers are usually dedicated for driving subwoofers.
200 watts x 1 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 speaker(s) or subwoofer(s) 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. The 5th channel on these particular amplifiers are usually dedicated for driving subwoofers.
350 watts x 1 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
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.
5
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.

710 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.
4 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.
0.05%
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.
1 pair
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)
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.

250 - 4000 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 - 10 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.
Yes
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
57%
4 Star
29%
3 Star
14%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.7
Value
4.9
Features
5.0
Design
5.0
Usability
4.7
Terry

Minden, LA

Overall
Durability
Value
Features
Design
Usability
Exactly as advertised

August 24, 2014

I ordered this amp after purchasing a boat with a system that was wired up with car audio equipment rather than marine equipment. The existing wiring was corroded and the two amp system just wasn't working very well. The only good thing was that the existing amps were class D amps, and stayed cool in the hot/damp environment, at the cost of corrosion. Needless to say, I was apprehensive about the temperature levels for this class A/B amp, especially since the only quality ground on a fiberglass boat is the battery inside the engine compartment. However, this amp does exactly what it is designed to do. I routinely spend 6-8 hours on the water, and the amp has never skipped a beat. As far as overall power, yes, there are better amps out there if you want to spend $500-$800. As for me, I'm very pleased, and my sound has never been more clear. Oh, and I use all 5 channels to run four Kicker 6.5's and one 10" sub. Next year, I plan on changing things up a bit and getting two wakeboard tower speakers, and this amp will be switching duties to that. Definitely worth the money.

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william

Clermont, GA

Overall
Durability
Value
Features
Design
Usability
Awesome amp

June 26, 2014

A little worried at first because of how cheap it was. Being a believer in MB products I got went Ahead with it. Put it in the boat and hooked it up. Sounds amazing and the two tens hit harder then a 1500 watt amp with two twelves. Highly recommended

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bill

louisiana

Overall
Durability
Value
Features
Design
Usability
Great product for the price

March 31, 2014

Received this amp in good time hooked it up and very impressed for the price happy with the sound and quality.

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tyrone

Warminster, PA

Overall
Durability
Value
Features
Design
Usability
nice amp

February 14, 2014

Amp provides plenty of power mb quart is a top quality brand.

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Joseph

Orange Park, FL

Overall
Durability
Value
Features
Design
Usability
MB Quart Amplifier

January 24, 2014

I just recently purchased this amplifier from Sonic and have it powering 2 sets of JBL 5.25 components and 1 JBL 10" subwoofer. I have to say this is one of the best bang for your buck amplifiers. The sound quality is crystal clear and the power is certainly there. Another impressive feature is for being an A/B amplifier it doesn't get too hot. The amplifier is actually white in color (the picture on the Sonic page makes it appear almost stainless steel) but it is a nice looking amplifier if that sort of thing is important to you. I wasn't aware it was a marine amplifier before i bought it but i guess it doesn't really matter. Car or boat it works just as well. Are there better amplifiers out there? Absolutely, but for the price you'll be hard pressed to find one. I'm very satisfied with my purchase and will be purchasing MB Quart products again regardless of ownership currently being Maxxsonics. I think in this case you get more than what you pay for. The reason I'm giving it overall 4 stars is to be fair to all the audiophiles out there because there are better amplifiers but prepare to shell out the money :) Value I'd give it 6 stars if I could. Great entry level 5 channel. As far as 5 channels go under $200, MB Quart simply cannot be beaten.

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rcr1971

yuma, AZ

Overall
Durability
Value
Features
Design
Usability
Impressed

December 14, 2013

Coming from a dual Alpine amplifier set up in my last vehicle I was apprehensive about going to a single 5 channel amp , Gotta admit I am glad I took the chance , Excellent highs and mids and the bass is clean and tight , very impressed , great bang for the buck , Hooked it up to a Pioneer AVH5500 , Polk DB 6501 components in the front doors , DB651 co-axials in the rear doors and (2) 10" Polk Mobile Monitor subs in a custom sealed enclosure , nice clean tight bass and still lots of gain to play with , if you are looking for a 5-channel amp and don't want to break the bank , take a chance on this MBQ 710.5

The only CON is that if you are looking to mount this under the front seat , its pretty good size and may not be possible.

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Pedro

bakersfield, CA

Overall
Durability
Value
Features
Design
Usability
WOW!!

November 5, 2013

Have this amp pushing a RE SEX10 and 4 6x9 mb quart,it never gets hot the bass is low and the highs have a great punch to them.

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Accessory Tools and Products

Accessories added

NVX XKIT42

Complete 4 Gauge Amp Wiring Kit with RCA Interconnect Cables and Speaker Wire!

Your Price $69.99

The InstallBay AK4 by Metra

4 Gauge Amplifier Installation Kit with RCA Interconnect Cable

Your Price $24.99

StreetWires ZN1K-04

4 Gauge (AWG) ZN1 Series Single Amplifier Installation Kit for Systems up to 1000 Watts

Your Price $49.95

Stinger SI4617 4000 Series Interconnect Cable

17 ft. 6-Channel 4000 Series Audio Interconnect Cable

Your Price $41.99

StreetWires SCP1215BL - 12 AWG Speaker Wire

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

Your Price $24.95

StreetWires FB4

4 AWG / 4 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 $14.99

Browse 1 question and 1 answer
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Why did you choose this?
Sonic Electronix Store
Look and reviews. Also the power handling, price and amount of Channels.. Needed solid 5 channel amp
marvin m on Sep 20, 2014

Product Summary

Manufacturer

Model Number

NA710.5

UPC

806576221890

Weight

12.00lbs

Internal SKU

na7105

Internal Product ID

69264

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 NA710.5