Reference Amplifiers

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Top Mounted Controls

The Reference line of amplifiers feature top mounted controls for system setting and stealth installation when adjustments are completed and wiring secured.

On Board Equalization

The Reference Series amplifiers have built in equalization to fine tune the system with Low Pass, High Pass and Level Control.


The highly engineered Q-Stasis pre-amplifier stage reduces incoming noise from source units dramatically improving sound quality.

Class SQ

Multi channel Reference amplifiers utilize Class SQ topology. Matched with Q-Stasis the sonic accuracy and clarity exceeds standard Class A/B amplifiers.

Class Q1 Mono

MB Quart’s Class offers the efficiency of today’s D-Class with increased engineering to focus on sound quality.


MB Quart output devices, FLUID-FETS are painstakingly selected for their ability to efficiently produce power and mimic the sound quality of the highest end home amplifiers.

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Car Audiophile

The MB Quart engineers designed the Reference line of amplifiers for one reason. “Give enthusiasts the best sounding amplifier available for a critical listening audio system.” With a mix of sound quality technologies, MB Quart amplifiers are about making music, not just sound pressure levels. The Reference amplifiers feature Q-Stasis pre-amplifier sections to keep incoming noise from source units at nearly immeasurable levels and Class SQ designs with FLUID-FET output devices to mimic the sound quality of the highest end home amplifiers. There is no doubt that these CEA compliant amplifiers have the high end sound and power you demand. More information

Reference Specs

Model 1-Ohm 2-Ohms 4-Ohms Mono Bridged @ 4-Ohms Dimensions L x W x H (inches)
RA320.2 N/A 2 x 160 2 x 80 1 x 320 10 x 8.27 x 2.4
RA400.2 N/A 2 x 200 2 x 100 1 x 400 11.18 x 8.27 x 2.4
RA480.4 N/A 4 x 120 4 x 60 2 x 240 13.94 x 8.27 x 2.4
RA640.4 N/A 4 x 160 4 x 80 2 x 320 15.51 x 8.27 x 2.4
RA1000.4 N/A 4 x 250 4 x 125 2 x 500 21.02 x 8.27 x 2.4
RA1000.1 1 x 1000 1 x 750 1 x 475 N/A 15.51 x 8.27 x 2.4
RA1500.1 1 x 1500 1 x 1000 1 x 500 N/A 17.09 x 8.27 x 2.4
RA2000.1 1 x 2000 1 x 1300 1 x 650 N/A 21.81 x 8.27 x 2.4
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