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D’Agostino Systems Introduces Progression Series 2 Amplifiers

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  • D’Agostino Systems Introduces Progression Series 2 Amplifiers

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    Bill McKiegan
    [email protected]

    Dan D’Agostino Master Audio Systems Introduces Second Generation Progression Amplifiers
    - Improved sound, higher power, and greater thermal efficiency highlight the new models -

    CAVE CREEK, AZ, MAY XXX, 2021 Dan D’Agostino Master Audio Systems today announced the second generation of Progression Series Amplifiers. First shipped in 2016, the new Progression models take advantage of technology advancements and circuit concepts utilized in the flagship Relentless Mono Amplifier.
    There is no mistaking the D’Agostino family styling of the new Progression M550 Mono Amplifier and the Progression S350 Stereo Amplifier. Immediately grabbing one’s attention is the new heat sink design. Drawn directly from the Relentless Mono Amplifier, this highly efficient elliptical form dramatically improves the cooling ability of the design and assures that the Progression Amplifiers run safely and reliably even when delivering its full rated power. Sporting the flair of the original Progression Series, the new Progression M550 Mono Amplifier features upgrades to the input stage, output stage, and heat sink design. The greater cooling ability of the heat sink structure permits greater output power. The Progression M550 Mono Amplifier delivers 550 watts into 8 ohms, doubling to 1,100 watts into 4 ohms and doubling again to 2,200 watts into 2 ohms. Similarly, the Progression S350 Stereo Amplifier outputs 350 watts per channel into 8 Ohms and then doubles to 700 and 1,400 into 4 and 2 Ohms, respectively. Both amplifiers employ 48 output transistors powered by a nearly 2,000 VA power supply transformer and 100,000 microfarads of power supply storage capacitance.

    A new power device provides the foundation for an upgraded output stage. This new transistor, first used in the Relentless Mono Amplifier, extends high frequency response, increases power handling by a factor of four 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 heat sink design affords an increase in operating bias. The higher bias specification has increased the Class A operating range of the amplifiers to 70 watts for the Progression M550 and 45 watts for the Progression S350. The result is improved instrument timbre and tonal reproduction for a great percentage of listening.

    “I am thrilled with the outcome of the new Progression M550 and S350 Amplifiers. Our senior engineer, Burhan Coskun, led this development and he exceeded the sonic and power performance enhancements I specified.” Said Dan D’Agostino, Co-Founder and Chief Engineer.

    The Progression M550 and S350 include major revisions to the input topology. The new Progression amplifier’s distortion, signal/noise ratio, channel separation, and bandwidth measurements have all improved. New transistors handle six times the power of the previous components and a new DC coupling circuity has improved low frequency performance and extended the bandwidth of the amplifiers. Coupling this advanced front end to the enhanced output stage has improved the dynamic impact, detail retrieval, and spatial integrity of the amplifier’s playback.

    Maintained from the original amplifier is the Super Rail topology. Simple in description but complex in execution, the Super Rail, counterintuitively, uses additional higher voltage power supplies in the input stage as compared to the main output stage. This higher voltage front end provides exceptional headroom for the output circuitry. Nearly ideal output stage operation results.

    The iconic look of the D’Agostino power meters, inspired by the elegant faces of classic Swiss watches, continues with the Progression series. The Progression amplifiers include a 180-degree needle swing meter design 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.

    The Progression amplifiers are available immediately and are available in silver, black, or custom painted finishes. The Progression M550 Mono Amplifier is $44,950/pr and the Progression S350 Stereo Amplifier is $25,950.
    For more information on Dan D’Agostino Master Audio Systems and its products, please visit
    Myles B. Astor, PhD, Administrator
    Senior Editor,

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