Progression S350 Stereo Amplifier

Power and Performance

The Progression S350 Stereo Amplifier leverages the innovative Super Rail circuitry employed in the M550 Monoblock, unique technology whose output stage operation results in improved dynamics, lower distortion, and a fierce grip of the loudspeaker. Every amplifier employs positive and negative voltage rails that deliver power to the speaker. The music signal swings between these two rails, but due to natural loss, the signal never reaches the output rails’ full capability. A Super Rail overcomes this limitation by boosting voltage in the sections prior to the output stage. 

A Substantial Foundation

Abundant power is required for realistic sound quality and is a cornerstone of Dan D’Agostino Master Audio Systems’ amplifier design. The graceful, anodized aluminum chassis of the Progression S350 houses a 2,000 VA power supply transformer coupled to nearly 100,000 microfarads of power supply storage capacitance. Paired to this foundation is a fully complementary driver stage, and output circuitry outfitted with 48 power transistors—24 each for the left and right channels generating an imposing output. Initially used in the Relentless Series, the output power device provides the foundation for an upgraded output stage. This transistor extends high-frequency response, increases power handling 50%, and features tighter tolerance gain matching between complementary NPN/PNP pairs. A wider safe operating area and superior gain linearity provides greater thermal stability throughout the amplifiers’ power delivery. Coupling the new output device to the high efficiency heatsink allows operating bias to be increased, lowering crossover distortion and improving instrumental timbre and tonal accuracy.

Elegantly Powerful

Drawn directly from the Relentless M550 Monoblock Amplifier, each heatsink is milled from a single, 48.5-pound (22 kg) aluminum billet slab whose highly efficient elliptical form dramatically improves cooling ability and assures reliable operation even when delivering full-rated power, an impressive 350 watts per channel into 8 ohms. Output doubles to 700 watts per channel into 4 ohms and 1,400 watts per channel into2 ohms. 

Combining innovative circuitry and significant power, the Progression S350 Stereo Amplifier lets loudspeakers achieve their full sonic potential, with music’s dynamic contrasts and leading-edge transients spectacularly depicted and faithfully reproduced.

Specifications