D’Agostino Progression M550


With innovative circuitry and virtually unlimited power output, the Progression M550 Mono Amplifiers deliver intimate musical details, three-dimensional sound staging, and startling dynamics not possible from less capable designs

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Progression M550

High Performance Elevated

Progression M550

There is no mistaking the D’Agostino family styling of the second generation Progression M550 Mono Amplifier.

Immediately grabbing one’s attention is the new heat sink design.

Drawn directly from the flagship Relentless Mono Amplifier, each heatsink is milled from a single, 22-kilogram aluminum billet slab.

This highly efficient elliptical form dramatically improves the cooling ability of the design and assures that the Progression M550 Mono Amplifier runs safely and reliably even when delivering its full-rated power.

Reflected in the model name, the Progression M550 Mono Amplifier delivers 550/1,100/2,220 watts into 8/4/2 ohms.

The Progression M550 includes major revisions to the input topology.

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.

Pairing this advanced front end to the enhanced output stage has improved the dynamic impact, detail retrieval, and spatial integrity of the amplifier’s playback.

The audio signal path throughout is discrete, balanced, and direct coupled.

Advanced protection techniques shield the amplifier and associated components from any unexpected anomaly.

Exploring New Dimensions

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 Progression M550 to 70 watts.

The result is improved instrument timbre and tonal reproduction for a great percentage of listening.

Maintained from the original amplifier is the Super Rail topology, a simple concept but complex in execution.

Every amplifier employs a voltage rail, actually two, a positive one and its companion negative partner.

Voltage rails support the delivery of power to the speaker.

The music signal swings between these two rails but due to natural loss, the musical signal never reaches the output rails’ full capability.

A Super Rail overcomes this limitation.

Borrowing the idea of a turbo in a car engine, the Super Rail employs higher voltage rails in the sections prior to the output stage.

This voltage “boost” allows the musical signal to exploit the full capability of the output voltage rails. Extending the musical signal swing closer to the output rails maximises the performance of the output circuitry design itself.

Nearly ideal output stage operation results with improved dynamics, lower distortion, and a fierce grip of the speaker.

The output topology employs 48 power transistors anchored by a 2,000 VA power supply transformer and nearly 100,000 microfarads of power supply storage capacitance.

Legendary Purity

The anodised Aluminum face-plate includes the iconic look of the company’s power meters.

The Progression M550  Mono Amplifier 180° meter needle is driven by a high-speed ballistic circuit improving the meter’s responsiveness.

The longer needle arc covers the amplifier’s entire output range.

With innovative circuitry and virtually unlimited power output, the Progression M550 Mono Amplifiers deliver intimate musical details, three-dimensional sound staging, and startling dynamics not possible from less capable designs.

Specification Progression M550

Specification Progression M550

Frequency Response

1 Hz to 80 kHz, -1 dB / 20Hz to 20 kHz, ±0.01 dB

Signal-to-Noise Ratio

105 dB – unweighted / 75 dB – A weighted


Silver or Black with Custom Finishes Available Upon Request

Input Impedance

100 KΩ

Output Impedance



550 watts @ 8Ω 1,100 watts @ 4Ω 2,200 watts @ 2Ω


550W @ 8Ω .015% @ 1 kHz


1 balanced XLR


17.875 x 9.0 x 23.0 in / 45.4 x 23.0 x 58.4 cm


115 lb / 52.2 kg

Progression M550 Angled

Priced individually


Dan D'Agostino

Dan D'Agostino


No name is more closely associated with high-end audio amplifiers than that of Dan D’Agostino. During his career of more than 35 years, D’Agostino pioneered countless advances in the design of amplifiers, preamplifiers, CD players, and surround-sound processors. He is known as the audio industry’s most passionate promoter of high-quality, high-powered amplification. Makers of the world’s finest loudspeakers rely on D’Agostino-designed amplifiers for their most important demonstrations. Dan D’Agostino was founder and chief engineer of Krell Industries through 2009. Since the inception of DDMAS in 2011, energised with a new organisation and new state-of-the-art designs, the products that bear his name not only achieve new levels of sound quality, they also look like nothing else in the industry. The new designs combine an elegant aesthetic flair coupled to inventive circuit topologies and innovative materials. Starting with the Momentum Mono amplifier, the D’Agostino product line now extends upwards to the awe inspiring Relentless Mono amplifier and outwards to the new Progression Integrated amplifier. The Relentless Mono Amplifier is an all-out assault on the amplifier category. Capable of driving any speaker to its fullest capability, the extraordinary power output of the Relentless Mono is only matched by its sublime low volume sound quality. The Progression Integrated amplifier connects the high-performance core of D’Agostino products to the exciting world of streaming audio with Tidal, Quobuz, and Spotify services as standard offerings. They are proud to say the Progression series components are hand built in the USA, by their team of craftsmen and technicians, in their Arizona facility. As impressive as these designs may sound on paper, the only way you can truly appreciate their warmth, detail and unmatched beauty is to experience them

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