Dan D'Agostino Progression Mono M550 Power Amplifier

The Progression circuitry borrows greatly from our Momentum amplifier. Its design couples our core circuit topologies and introduces a new Dan D’Agostino Master Audio Systems topology, the Super Rail. Simple in description but complex in execution, the Super Rail, counter intuitively, uses additional higher voltage power supplies in the input stage than the main output stage. This higher voltage front end provides exceptional headroom for the output circuitry. Nearly ideal output stage operation results. It employs a fully complementary driver stage, outfitted with 84 output transistors—42 for the positive signal and 42 for the negative signal, a nearly 3,000 VA power supply transformer, and 400,000 microfarads of power supply storage capacitance. The iconic look of the Momentum amplifiers’ power meters, inspired by the elegant faces of classic

Swiss watches, continues with the Progression series. The Progression mono amplifier features a new meter design with a 90-degree needle swing, driven by a high-speed ballistic circuit that enhances the meter’s responsiveness. The longer swing allows the needle to cover the amplifier’s entire output range.