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The M205 Mono Amplifier

Impressive performance.  Compact mono design. 

Innovation. Redoubled.

After the resounding success of the S202 Stereo Amplifier, there were many requests for an improved mono amplifier in the same compact chassis. The M205 refines the S202’s already incredible performance with an upgraded input stage and a doubling of the power supply transformers and capacitors. The result is a spectacular increase in sound quality with increased sound-stage definition, vocal realism, and instrument solidity available from the very first notes. The M205 perfectly complements our DAC’s ultra high dynamic range with optimized architecture in the critical areas of audio performance, power supplies, and ultra low-noise design. The fully modular cores, matched impedance input stages and billet CNC chassis’ result in the highest value mono amplifiers we’ve ever created.

Power without limits.

Thanks to two massive custom low-noise high-current toroidal transformers and rugged high-current output buffers, the M205’s provide a transparent, holographic listening experience that’s completely fatigue free. This ensures that the amplifiers present consistent performance even with difficult speakers. 

Input Architecture.

The M205 features a discrete design with a Class-A matched impedance input stage. The result is a product with minimized signal reflections, input noise, and distortion, while also maximizing power transfer and dynamic range in a zero negative feedback design. All components were meticulously chosen for their sonic performance and longevity, ensuring your amplifier is built to last.


Billet CNC chassis.

The M205 amplifiers are designed and lovingly crafted in our factory based in California. After 28 hours of CNC machining, two complete chassis’ of billet aluminium components are ready, maximizing heatsink area with a stunning visual profile. This high-efficiency design provides a surface area of over 3,000 in² per amplifier. High-power heat pipes distribute heat evenly for optimal thermal and electrical performance.


Core values.

Building the M205 amplifiers with core enclosures greatly improves their reliability and performance. Upon completion, the cores are rigorously tested and stocked for orders, ensuring the highest quality product is ready at a moment’s notice. With this segmentation, your system is optimized for performance and resilience.


Smart control features.

The M205’s are equipped with simple, user-friendly control interfaces. Intuitive push buttons, remote commands, and the 12V triggers guarantee control over power and standby modes. Further control of amplifiers “power on” timers and soft-start circuits allow a multi-amplifier system to power up without putting strain on your listening room’s electrical system.


Powerful configurations.

Intuitively oriented speaker lugs direct your speaker cables in the right direction without strain. With dual outputs, the M205 is ideal for a bi-amped system. Multiple ground posts enable EMI reduction strategies, including shielded cables and system star grounds.

MSB M205 Mono Power Amplifier

  • The M205 Mono Amplifier
    (per mono amplifier)

    Static Power Consumption 90 Watts On
    Standby power less than 2 watts
    Operating Voltage Range 120/240V (Auto switching)
    100V (Fixed)
    Fuse 1/4"x1-1/4" 10A 250V Slow Blow
    Input 1x XLR Input
    Output 2x Binding post set per channel
    Controls Input Impedance Switch
    On/Off Button
    Standby Button
    Display Dimmer
    12V Mode Switch
    2x MSB 12V trigger port
    Continuous Power Output (8Ω) < 1% distortion 220 W
    Continuous Power Output (4Ω) < 1% distortion 400 W
    Dual Bi-Amp Continuous Power Output (8Ω) < 1% distortion 200W
    Dual Bi-Amp Continuous Power Output (4Ω) < 1% distortion 380W
    Frequency Response (20 to 20kHz) ±0.03dB
    Signal to Noise (20 to 22kHz) >130dB (>133dBA)
    Equivalent Input Noise (22kHz BW) 0.65μV
    Gain (150Ω source impedance) 23.8dB
    Input Impedance (User Selectable) 75Ω / 300Ω / 1.2kΩ
    Output Impedance (20 to 20kHz) 0.01Ω 


    Input/Gain Stage - Class-A
    - Double balanced
    - Impedance matched
    - Fully discrete
    - Independent power
    Output Stage - Class-AB
    - Balanced
    - Medium bias
    - Current gain only

    Chassis Dimensions (Per Mono Block)

    Width: 16 in (404 mm)
    Depth: 19 in (483 mm)
    Height: 6.5 in (165 mm) Without Feet
    7 in (178 mm) With Feet
    Weight: 90 lbs (41 kg)
    Product Feet: M6X1 Thread
    3 or 4 Foot Configuration

    Shipping Dimensions (Per Mono Block)

    Width: 24 in (610 mm)
    Depth: 28.25 in (718 mm)
    Height: 16.5 in (419 mm)
    Weight: 137 lbs (62 kg)

    Included Accessories

    User Manual
    IEC Power Cord

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