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MB Quart RM740.5

740W Max 5-Channel Reference MYKRO Series Hybrid Class D Full-Range Car Power Amplifier

MB Quart
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• 75W x 4 Chan. @ 4 ohms
• 110W x 4 Chan. @ 2 ohms
• 220W x 2 Chan. @ 4 ohms
• 4-Way System Protection
• 5/4/3/2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• FLUID-FETS Circuit for Smooth Sound Quality

Learn more about the rm7405

We apologize

This item has been discontinued

Product Highlights


• 75W x 4 Chan. @ 4 ohms
• 110W x 4 Chan. @ 2 ohms
• 220W x 2 Chan. @ 4 ohms
• 4-Way System Protection
• 5/4/3/2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• FLUID-FETS Circuit for Smooth Sound Quality

Description


MB Quart brand icon

Authorized dealer

General Features:

  • Reference MYKRO Series 5-Channel Hybrid Class D Full-Range Car Amplifier
  • Channel 1-4 Max Power Rating:
    • 4 ohms: 75 watts x 4 chan.
    • 2 ohms: 110 watts x 4 chan.
    • Bridged, 4 ohms: 220 watts x 2 chan.
  • Subwoofer Channel Max Power Rating:
    • 4 ohms: 200 watts x 1 chan.
    • 2 ohms: 300 watts x 1 chan.
  • FLUID-FETS MOSFET Circuit maximizing power efficiency while improving sound quality
  • Q-Stasis Pre-amplifier stage for a cleaner signal from the source unit
  • Ultra low ESR high capacity power supply storage bank
  • Hybrid Class D Full range design for small footprint and exceptional sound quality
  • LED power (green) and protect (red) indicators
  • Variable Bass Boost (0 to +12 dB bass boost)
  • Built-in system diagnostics and top-mounted controls
  • 5/4/3/2/1 Channel operation
  • Preamp RCA outputs to daisy chain multiple amps
  • 4-way protection circuitry (thermal, overload, and speaker short protection, DC offset)
  • Extruded aluminum heatsink design
  • Input sensitivity:
    • Level: 200mV-6V
  • Variable high-pass filter (50-3000 Hz 24 dB/octave)
  • Variable low-pass filter (Chan 3 & 4 50-3000 Hz 24 dB/octave)
  • Frequency response: 10-20000 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: 6-1/2"W x 10-1/4"D x 1-15/16"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Specifications & Details


Power Specifications - Full Range Channels
RMS Power @ 4 ohms
75 watts x 4 channel
RMS Power @ 2 ohms
110 watts x 4 channel
Bridged RMS Power
220 watts x 2 channel
Amplifier Specifications
Series
Reference MYKRO Series
Amplifier Class
D
Number of Channels
5-Channel
Total Peak Power Output
740 watts
Total RMS Power Output
440 watts
Maximum Input Gauge Size
4 AWG
Minimum Impedance Unbridged
2 ohms
Minimum Impedance Bridged
4 ohms
THD at Rated RMS Power
0.02%
Speaker Level Inputs
No
Preamp Outputs
1 pair
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
High-Pass Crossover Frequency
50 - 3000 Hz
Low-Pass Crossover Frequency
50 - 3000 Hz
Signal-to-Noise Ratio
90 dB
Channel Separation
80 dB
Remote bass/level controller
No
Fuse Rating
40A x 2 
Strappable
No
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

RM740.5

Weight:

7.50lbs

Internal SKU:

rm7405

Internal Product ID:

67886

Product and How-to Videos


  • MB Quart Reference MYKRO Amplifiers (Micro Class D) | Maxxsonics @ CES 2013
  • How To Install an Amplifier: Car Amplifier Basics Part 2

Customer Ratings & Reviews



5 star
0%
4 star
33%
3 star
67%
2 star
0%
1 star
0%



Durability
2
Value
4
Features
3.7
Design
4.4
Usability
4

Customer Reviews

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MB Quart RM740.5 - Shipped with DEAD Sub Channel

Bought this amp to power a new install into a 2006 Ford F-250 Super Duty. This was to match to two sets of MB Quarts 6.5 Comp and a MB Quarts 12" Shallow mount sub.
So after getting everything wired up to do the initial test before closing everything off found that the sub channel was dead!
So two days of re-wiring, cust. subbox creation we only have for channels. To make it worse the amp is on back order!

Pretty disappointed in MB Quarts quality control, really makes me weary of the quality that MB Quarts has become from what they once were!

By theDogger on September 1, 2013

7

found this helpful.

Realibility ?????

I bought this amp and i had to return it two month later because the amp overheated. They replace it ,no question ask, but the new one output distortion when cold :-(

By LO on October 24, 2013

6

found this helpful.

Installed and operational

I purchased this 5 channel amp for installation into a small car because of its compact profile. The wattage ranges (75 per channel/200 sub)offer many choices for speakers and subs that are capable of filling a small car with a generous level of sound...at a lower price point than other comparable amps with around the same output levels.

A word about some inaccuracies in their .pdf manual, page 8:

They list the power/ground terminals as "2-ga" or 2 gauge or 2 awg. No...not even close. There is no way a 2 gauge wire fits in that tiny little hole. I know because I ran a 2 gauge power wire and I would have had to snip 30% of the strands to get it to fit. It's closer to a 6 gauge which is what I ran to the amp from a distribution block that I lead the 2 awg into...no biggie, but they should correct that.

They list the speaker wire block as able to receive 16 gauge...I ran 14 gauge with no problem and it fit with room to spare.

They list the subwoofer block as able to receive 14 gauge, but it is the exact same size as the power/ground block. (so, it's big for any sub that this little thing could ever hope to drive)

It's been a week since I installed it and so far I am quite happy with it. I installed the larger gauge power/ground/speaker wire in case it couldn't perform as well as I hoped and I needed to upgrade to a more powerful amp (not doing that job twice) but so far I am happy with the amount of "bump" it has. If you want your car to rattle, this is not the amp, but if you have a small car and want to put in a discreet upgrade, I recommend this little number. Sounds good.

Oh and I did contact MB Quart for something regarding this amp and the emails were immediate, friendly and helpful. That matters...to me anyway.

By experienced installer on September 23, 2013

3

found this helpful.

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