Dan D'Agostino Progression S350 Stereo Amplifier

The Progression S350 Stereo Amplifier adds a potent stereo option to the Progression family, leveraging our innovative Super Rail circuitry to deliver exceptional control and fidelity to any connected loudspeaker. Super Rail technology works by boosting the voltage prior to the output stage, allowing the musical signal to fully exploit the output voltage rails. This extension of the signal swing improves dynamics, reduces distortion, and ensures a tight grip on the speaker, maximizing performance across the frequency range.

Abundant power is fundamental to realistic sound quality, and the Progression S350 continues Dan D'Agostino Master Audio Systems’ tradition of delivering immense power. The amplifier is housed in a graceful anodized aluminum chassis and is powered by a 2,000 VA power supply transformer, paired with nearly 100,000 microfarads of power supply capacitance. The fully complementary driver stage and output circuitry are equipped with 48 power transistors, 24 for each channel, producing an impressive output. The upgraded output stage uses a transistor initially developed for the Relentless Mono, enhancing high-frequency response, increasing power handling by 50%, and improving gain matching between the NPN/PNP pairs. The combination of these upgrades leads to greater thermal stability, lower crossover distortion, and improved tonal reproduction. With 350 watts into 8 ohms, 700 watts into 4 ohms, and 1,400 watts into 2 ohms, the Progression S350 faithfully reproduces dynamic contrasts and delivers spectacular transient details.

The design of the Progression S350 is both elegant and powerful, drawing inspiration from the faces of classic Swiss watches. The amplifier features an exposed movement power meter with two 90° needle swing arms. A high-speed ballistic circuit enhances meter responsiveness, with the extended needle arc improving readability across the amplifier’s entire output range. The heat sinks, derived from the Relentless Mono Amplifier, are milled from a single 48.5-pound (22-kilogram) aluminum billet. This highly efficient elliptical design significantly enhances the amplifier's cooling ability, ensuring reliable performance even when delivering full-rated power. The standard finishes include silver and black, with custom painted finishes available on request.

Combining innovative circuitry and substantial power, the Progression S350 Stereo Amplifier gives loudspeakers the control they need to express their full design potential.