Dan D'Agostino Momentum HD Preamplifier

The Momentum HD Preamplifier is the evolution of one of Dan D’Agostino’s most celebrated designs, taking an already outstanding preamplifier and enhancing it with advanced technology, refined circuitry, and improved control systems. This HD edition introduces meaningful upgrades to the power supply, audio path, and user interface, delivering a level of performance that brings even greater speed, depth, and tonal richness to any system.

At the core of the Momentum HD is a newly engineered power supply featuring a transformer that is 33% larger than the original. Using advanced winding techniques first employed in the Momentum M400 amplifier, this transformer delivers increased current output without increasing physical footprint. With more headroom available, the output stages now operate at a 36% higher voltage rail—translating to faster transient response, improved dynamic contrast, and superior control, especially during complex passages.

The redesigned audio circuitry brings the most profound sonic improvement. A new discrete differential FET input stage with ultra-high input impedance—greater than 1MΩ—minimizes interaction with source components and isolates the signal path from noise and distortion. Originally developed as an experimental topology, this circuit delivered results that exceeded expectations, revealing finer details and delicate musical shadings with newfound accuracy. Subtle textures and tonal nuances come alive, giving instruments and voices greater realism and emotional impact. To maximize this performance, the output stage was also revoiced, creating a seamless synergy across the full signal path.

Control functionality has also been elevated. The HD edition introduces Bluetooth connectivity to its remote system, replacing the traditional infrared format. This upgrade dramatically increases range and eliminates the need for line-of-sight operation. New tone and volume circuitry enhances both range and precision, offering more granular control over your system’s presentation and making it easier to tailor the experience to your preferences.

Aesthetically, the Momentum HD reflects the signature D’Agostino design language, now with refined copper accents that mirror the sculpted look of the Momentum M400 and S250 MxV amplifiers. Available in silver or black, the preamplifier exudes elegance while complementing any high-performance audio system.