Dan D’Agostino Momentum S250 MxV Stereo Amplifier


The Dan D’Agostino Momentum S250 MxV Stereo Amplifier epitomizes the pinnacle of audio engineering, offering the extraordinary sound quality of the renowned Momentum M400 MxV monoblock in a more accessible stereo design. It inherits the same circuit topology, ultra-efficient copper heat sinks with venturi cooling, 1% metal-film resistors, 69 MHz output transistors, and an entirely complementary balanced configuration from its monoblock counterpart. This results in an unparalleled level of audio fidelity unmatched by any other amplifier except the Momentum M400 MxV itself.

Key Features:

  1. Advances in Every Area: The Momentum S250 MxV amplifier has witnessed enhancements in every significant section, including power supply, input, driver, and output stages. A new transformer pattern delivers over 50% more current output from the same transformer footprint, providing excellent headroom during dynamic passages.
  2. Enhanced Input Stage: The input stage combines a brand-new circuit topology with advanced components that feed the driver and output stages. High-powered bipolar transistors are employed in the front end, providing ten times the current and power of the original devices. These components contribute to extended low and high-frequency performance with reduced distortion.
  3. New Bias Stability Circuit: Adding a new bias stability circuit results in a nearly 50% increase in operating bias, improving sound quality. The unique copper heatsinks and this new circuitry ensure consistent bias levels without excessive temperatures, even under demanding conditions.
  4. High-Output Transistors: The final output stage features high-output transistors, initially sourced for the flagship Relentless Monoblock Amplifier. Running at an impressive 69 MHz, these transistors facilitate incredible bandwidth and are meticulously mounted for maximum thermal transfer to the copper heat sinks.
  5. Mass times Velocity Equation (MxV): The Momentum S250 MxV takes its name from the physics equation “MxV” which stands for Mass times Velocity, symbolizing momentum. This reflects the fullest expression of the Momentum circuitry.
  6. Innovative Cooling with Venturi Style Heatsinks: The amplifier incorporates a driver section that is an entirely complementary design, significantly increasing current drive to optimize the output stage. This amplification results in a more authoritative, more prosperous, and expansive sound.
  7. Hand-built and Individually Tested: Each Momentum S250 MxV stereo amplifier is meticulously hand-built and individually tested by a team of skilled technicians and craftsmen in D’Agostino’s Arizona factory.


  • Frequency Response: 1 Hz to 200 kHz, -1 dB / 20 Hz to 20 kHz, ±0.1 dB
  • Signal-to-Noise Ratio: 105 dB, unweighted
  • Input Impedance: 1 MΩ
  • Output Impedance: 0.12Ω
  • Power Output: 250 watts @ 8Ω, 500 watts @ 4Ω, 1,000 watts @ 2Ω
  • Distortion (250 watts @ 8Ω): 0.1% @ 1 kHz
  • Inputs: 2 balanced XLR
  • Dimensions: 12.5 x 21.5 x 5.25 inches / 31.75 x 54.61 x 13.34 cm.

The Dan D’Agostino Momentum S250 MxV Stereo Amplifier exemplifies an unparalleled commitment to audio excellence. Its innovative engineering and meticulous craftsmanship make it a masterpiece in high-end audio amplification. This amplifier is designed to bring out the absolute best in any loudspeaker, delivering a listening experience that is second to none.


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