Dan D'Agostino Momentum S250 MxV Stereo Amplifier

The Dan D’Agostino Momentum S250 MxV Stereo Amplifier represents the latest evolution of one of the most celebrated amplifier platforms in high-end audio. Incorporating the full spectrum of innovations pioneered in the flagship RelentlessMono Amplifier, the S250 MxV sets a new standard for stereo amplification, combining raw power with unmatched finesse and detail—all within a compact, beautifully machined chassis.

At the heart of the S250 MxV lies a newly engineered 2,200 VA linear transformer, which uses a unique winding pattern to reduce hysteresis loss by 90%—resulting in increased efficiency and output capability. This powerhouse of a supply drives a nearly 100,000μF capacitor bank, allowing the amplifier to effortlessly deliver 250 watts into 8 ohms, 500 watts into 4 ohms, and a staggering 1,000 watts into 2 ohms. Whether paired with the most demanding speakers or playing dynamic orchestral passages, the S250 MxV responds with authority, precision, and depth.

Building on the Momentum legacy, the S250 MxV features a fully balanced, discrete signal path that eliminates distortion and ensures sonic purity at every stage. Newly developed front-end bipolar transistors supply ten times the power of the previous generation, while a completely redesigned input stage introduces a post-filter feedback loop—greatly reducing noise and enhancing transparency. These enhancements contribute to a higher operating Class A bias, delivering increased musical detail and warmth without compromising efficiency or thermal stability. Thanks to D’Agostino’s signature copper venturi-style heat sinks, the amplifier maintains optimal performance even under high-demand conditions.

The output stage benefits from the inclusion of ultra-high-speed 69 MHz output transistors—originally developed for the Relentless Monoblocks. With 26 of these precision-matched devices per amplifier, the S250 MxV achieves extraordinary bandwidth and dynamic capability. Each transistor is mounted with dual stainless steel fasteners for maximum thermal transfer, and a dedicated capacitor/resistor network ensures stability across the frequency range and with any speaker load.

Mechanical excellence matches electrical innovation. The S250 MxV is machined from solid aluminum with a stunning industrial design that speaks to both power and refinement. The iconic analog watt meters, elegant dial, and polished finishes are hallmarks of the D’Agostino aesthetic—engineered not just to perform, but to inspire.

Designed to integrate seamlessly with D’Agostino’s Momentum HD Preamplifier and other flagship components, the S250 MxV delivers a listening experience that is deeply immersive and emotionally resonant. Every nuance, from the quietest whisper of a violin to the full-scale dynamics of a live concert, is rendered with effortless realism.

Each unit is hand-built and individually tested in Arizona to the most exacting standards, and for existing Momentum Stereo owners, an upgrade path to MxV performance is available—preserving your original chassis while incorporating every new circuit and performance enhancement.