Dan D’Agostino Momentum M400 MxV Monoblock Amplifier


The Dan D’Agostino Momentum M400 MxV Monoblock Amplifier represents the pinnacle of amplifier engineering, blending advanced technology with meticulous craftsmanship. Building upon the legacy of the original Momentum Mono Amplifier, this latest iteration, the M400 MxV, takes the iconic design to new heights.

Key Features:

  1. Enhanced Circuitry: The Momentum M400 MxV incorporates advancements in every major section of the amplifier, including the power supply, input, driver, and output stages. A new transformer winding provides over 50% more current output, resulting in greater headroom during dynamic passages.
  2. Reimagined Input Stage: The input stage features a brand-new circuit topology and advanced components that feed the driver and output stages. Key to this circuit are the bipolar transistors powering the front end, delivering significantly higher current and power compared to the original components. This widens bandwidth and enhances low and high-frequency performance.
  3. Bias Stability Circuit: A new bias stability circuit provides nearly 50% more operating bias, increasing Class A operation. This leads to improved sound quality. The unique copper heatsinks and topology ensure that thermal issues are effectively managed, even under high-demand scenarios.
  4. Output Stage Excellence: The final output stage features high-speed output transistors sourced from the flagship Relentless Monoblock Amplifier. These transistors run at an impressive 69 MHz, allowing the Momentum M400 MxV to achieve exceptional bandwidth. Each transistor is securely mounted for maximum thermal transfer.
  5. Super Rail Topology: This innovative design employs higher voltage rails before the output stage, allowing the musical signal to utilize the full capability of the output voltage rails. This maximizes output stage performance, improving dynamics and a tighter grip on the speaker.
  6. Ultra-Quiet Transformer: The amplifier has a 2,200 VA linear transformer with a new winding scheme that reduces hysteresis effects by 90%. This minimizes power and thermal loss, leading to a 50% improvement in output.
  7. Venturi Style Heatsinks: The driver section, a critical element of the amplifier output stage, is an entirely complementary design. This effectively doubles the current drive necessary for enhanced output stage performance.
  8. Hand-Crafted Excellence: Each Momentum M400 MxV monoblock amplifier is meticulously hand-built and individually tested by the skilled team at D’Agostino’s Arizona factory.


  • Frequency Response: 1 Hz to 200 kHz, -1 dB / 20Hz to 20 kHz, ±0.1 dB
  • Signal-to-Noise Ratio: 115 dB (unweighted)
  • Input Impedance: 1 MΩ
  • Output Impedance: 0.11Ω
  • Power Output:
    • 400 watts @ 8Ω
    • 800 watts @ 4Ω
    • 1,600 watts @ 2Ω
  • Distortion: 0.09% @ 1 kHz (400W @ 8Ω)
  • Inputs: 1 balanced XLR
  • Dimensions: 12.5 x 21.5 x 5.25 inches / 31.75 x 54.61 x 13.34 cm.
  • Weight: 95 lbs.

The Dan D’Agostino Momentum M400 MxV Monoblock Amplifier stands as a pinnacle of amplifier design, delivering unmatched power, precision, and musicality. With its innovative technologies and unwavering commitment to sonic excellence, it serves as a reference-class amplifier for the most discerning audiophiles.


There are no reviews yet.

Be the first to review “Dan D’Agostino Momentum M400 MxV Monoblock Amplifier”