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MB Quart FX4.70

560W RMS, 4-Channel Formula Series Amplifier

  • 4.3

(7 reviews)

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The product on this page is discontinued.

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Customer Testimonial

I purchased a Code Alarm 671 & didn't know what bypass I would need for my truck. I sent Sonic an email & Michael responded within 24 hours. He told me which bypass would work & even gave me the link for it. That saved me a lot of time searching. Thanks Sonic! The customer service was great.

- L.

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MB Quart FX4.70 Features:
  • Formula Series 4-Channel Class A/B Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 70 watts x 4 chan.
    • 2 ohms: 140 watts x 4 chan.
    • Bridged, 4 ohms: 280 watts x 2 chan
  • PWM (Pulse Width Modulated) MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Variable Bass Boost (0 to +9 dB bass boost at 45 Hz
  • 4/3/2 Channel operation
  • Unbalanced RCA input jack
  • Preamp RCA outputs to daisy chain multiple amps
  • 4-Way System Protection circuitry (DC, thermal, overload, and speaker short protection)
  • Heavy duty aluminum alloy convection heatsink for superb heat dissipation
  • Silver-plated RCA level inputs
  • Silver-plated screw terminals
  • Input sensitivity:
    • Low level: 200mV-6V
  • Signal to noise ratio: 90dB
  • Channel separation: 80dB
  • Variable low-pass filter: 30-150 Hz
  • Variable high-pass filer: 10-1200 Hx
  • LP/HP/Full crossover switch
  • Damping factor: >180
  • Frequency response: 10-45,000 Hz
  • Dimensions: 12-3/4"L x 9-1/2"W x 2-1/4"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.
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
Power Specifications - Full Range Channels
RMS Power @ 4 ohms 70 watts x 4 channels
RMS Power @ 2 ohms 140 watts x 4 channels
RMS Power @ 1 ohm Not Stable
Bridged RMS Power 280 watts x 2 channels
Peak Power Output Not Specified
Amplifier Specifications
Amplifier Class AB
Number of Channels 4
Total Peak Power Output Not Specified
Total RMS Power Output 560 watts
Maximum Input Gauge Size 8 AWG
Minimum Impedance Unbridged 2 ohms
Minimum Impedance Bridged 4 ohms
THD at Rated RMS Power .05%
Speaker Level Inputs No
Preamp Outputs No
Built-in Crossover Low-pass (LP)
High-pass (HP)
Full (AP)
High-Pass Crossover Frequency 10 - 1200 Hz
Low-Pass Crossover Frequency 30 - 150 Hz
Subsonic Filter Not Specified
Signal-to-Noise Ratio 90 dB
Channel Separation 80 dB
Bass Boost 0 - 9 dB
Bass/Gain Remote No
Fan Cooled No
Fuse Rating 20A x 2 
CEA-2006 Compliant No
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration 1 year
Labor Warranty Duration 1 year
Warranty Provider Manufacturer
Customer Review Summary for MB Quart FX4.70
Average Customer Rating is 4.3 out of 5 stars:
  • 4.3
based on 7 Reviews
Share your thoughts with others:
Rating Distribution:
5 star:
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.
57%
4 star:
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29%
3 star:
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0%
2 star:
.
.
14%
1 star:
.
0%
what's this?
Average Attributes Rating:
Durability
  • 4.1
4.1
Value
  • 4.6
4.6
Features
  • 4.3
4.3
Design
  • 4.0
4.0
Usability
  • 4.6
4.6
what's this?
Quick Comparison:
Most Helpful Customer Reviews:
February 14, 2013 not as good as it seems
Review by
Thomas from Sydney, Australia
Overall
  • 2.0
Durability
  • 1.0
Value
  • 2.0
Features
  • 3.0
Design
  • 2.0
Usability
  • 2.0
I've had one of these for less than a year and already it is completely useless. Sound cuts in and out every 5 seconds or just doesn't work at all, never going with MB Quart again.
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December 3, 2012 Fantastic sound
Review by
MCFL from Tampa, FL
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
I had a Kenwood KAC-8405 used from ebay that only lasted 6 months, after that bad experience I decided to give a chance to the MB Quart FX4.70 and I have to say that I am amazed of the quality. The sound is just amazing and much better than the Kenwood, highs are detailed and crisps, mid and low end bass amazing too.

If you are somebody like me that cannot expend hundreds and hundreds of dollars in a system but like to enjoy hi-fi sound this is the amplifier to try.

I have mine connected to the stock head unit of my Saab 93 and I really do not see a need to upgrade the head unit at all, the sound is detailed, accurate and extremely hi-fi to my standards
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October 17, 2012 Great Amplifier!!
Review by
hk from miami, fl
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
Best ever had, great power, great sound for the speakers and the original radio I used; cassette BMW M3 Radio, and it sounds as any new radio. Love my amplifier, will recommend.
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September 24, 2012 Just as planned :D
Review by
Mobile Enclosures from New London, CT
Overall
  • 4.0
Durability
  • 4.0
Value
  • 5.0
Features
  • 5.0
Design
  • 4.0
Usability
  • 5.0
I purchased this for my MB Quart components and it is solid. Still works very well and as long as you do not abuse electronics, they will last forever. The clarity is audible and with the right lossless formatting, this amp will shine. It has a great amount of filters and options for virtually any set of speakers on the market. For the price, this is really a great product.
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September 15, 2012 Very Happy
Review by
Jason from Huntington Beach, CA
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 4.0
Design
  • 4.0
Usability
  • 5.0
Extremely happy with this amp. For the price and power nothing else can touch it. I have the amp powering 4 Infinity Kappa 682.9cf 6x8 door speakers @ 2ohms.

The speakers are actually only rated for 100w rms per channel but I am pushing them with this amp @ the manufacturer stated 140w rms (in all actuality it's probably closer to 120). I'm confident that if I was using a cheaper quality amp I wouldn't be able to push the speakers that hard without risking some damage. I am getting nice bright highs, decent mids and some fantastic bass from the speakers. Would recommend this amp for your setup without hesitation.
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View All 7 Reviews for MB Quart FX4.70
Amplifier Wiring Kits
Get the wires you need to properly install and power your car amp.
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Bass Remote Control
Control the volume level of your bass and amplifier from the front of the vehicle.
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Small Universal Remote Level Bass Control Small Universal Remote Level Bass Control
The Scosche RLC is a smaller universal bass remote that connects via RCA inputs.
$14.99
Speaker Wire
Improve the sound quality by delivering more power when replacing your factory wiring. High quality speaker will maximize your amplifier investment and system performance.
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NVX XWS1225 Speaker Wire NVX XWS1225 Speaker Wire
25 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire
$39.99
NVX XWS1250 Speaker Wire NVX XWS1250 Speaker Wire
50 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire
$29.99
Kicker XW1220 Speaker Wire Kicker XW1220 Speaker Wire
12 Gauge Wire - 20 ft. of Dual Twist Speaker Cable with Sleeves for a Clean Install
$34.95
StreetWires SCP1215BL - 12 AWG Speaker Wire StreetWires SCP1215BL - 12 AWG Speaker Wire
12 Gauge Wire - 15 ft. of Speaker Cable with Twisted Construction
$24.99
RCA Interconnects
You will need a good set of RCA interconnect cables to connect your amplifier to your head unit. Using high quality cables ensure the best sound possible by reducing unwanted noise interference, providing tight contacts, and utilizing the latest in cable technology.
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NVX XIV45 4-Channel RCA Audio Interconnect Cable NVX XIV45 4-Channel RCA Audio Interconnect Cable
5 Meters (16.4 ft.) 4-Channel RCA Audio Interconnect Cable with Dual Twisted Pair Hyper-Flex Technology
$23.99
NVX XIX45 X-Series RCA Interconnect Cable NVX XIX45 X-Series RCA Interconnect Cable
16.4 ft. of 4-Channel X-Series RCA Cable with Dual Twisted Pair Hyper-Flex Technology
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StreetWires ZN9 Series Interconnect Cable StreetWires ZN9 Series Interconnect Cable
16.4 ft. of 4-Channel RCA Cable with Rhodium-plated contacts and ZeroNoise construction for clear signal transfer!
$99.99
Installation, Tools & Accessories
With our professional install card, you can have your amp installed by a pro near you, or you can purchase tools and do the install yourself.
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StreetWires FB4 StreetWires FB4
4 AWG / 4 Gauge Firewall Bushing
$7.99
Kicker DB1448 (09DB1448) - Top of the Line! Kicker DB1448 (09DB1448) - Top of the Line!
Distribution Block with Two 1/0 or 4 AWG Inputs and Four 4 or 8 AWG Outputs
$24.95
Professional Installation for your Car Power Amplifier Professional Installation for your Car Power Amplifier
Covers labor charges through our professional installer network.
$89.99
Testing and Performance
Optimize your system's performance with testing tools such as SPL meters, bass test discs and more!
  Product Price Add?
Scosche SPL Meter SPL1000F Scosche SPL Meter SPL1000F
Handheld boomSTICK measures your SPL range from 60 to 135 dB
$24.99
AutoSound 2000 CD-104 AutoSound 2000 CD-104
The ultimate amplifier level setting disc used for evaluation of audio components
$12.99
AutoSound 2000 CD-102 AutoSound 2000 CD-102
High Frequency Test CD specifically designed for the set-up and evaluation of sound system imaging and placement.
$12.99
AutoSound 2000 CD-103 AutoSound 2000 CD-103
Audiophile reference series test disc for evaluation of all audio components.
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Product Summary

Manufacturer: MB Quart
Model number: FX4.70
UPC: 806576217992
Weight: 9.00 lbs
Internal SKU: fx470
Internal product ID: 33004