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Dan D’Agostino Progression M550 & S350: Mono / stereo power amplifier

As the responsible Audio Reference sales department from Hamburg reports, the second generation of the legendary progression amplifiers from Dan D’Agostino is now available. The new amps offer even more power, improved sound and optimized cooling.

Dan D’Agostino Progression M550 mono power amplifier

This great guy (top right in the picture) has an output of 550 watts at 8 ohms or 1100 watts at 4 ohms and is derived from the amplifier flagship Relentless. The first thing that catches your eye is the new design of the heat sink: This is now milled from a single, impressive 22 kilo aluminum block. Its specific shape should noticeably improve the cooling performance and ensure that this mono amp runs stably even at full power output. Compared to the previous model, according to the press release, there has been a significant revision of the circuit design of the input stage. The result: significant improvements should result in terms of channel separation and bandwidth as well as distortion and the signal-to-noise ratio. In this device class, it is not surprising that the entire audio signal path is completely discrete and fully symmetrical.

The inner workings of the Dan D’Agostina Progression M550 mono power amplifier – the heat sink is milled from solid aluminum

A newly installed transistor type serves as a further basis for the sound improvement, which is superior to the previous one both in the high frequency range and in terms of sheer performance. Due to the increased bias specifications, it is now possible for the Dan D’Agostina Progression M550 mono power amplifier to run completely in Class A mode up to an output of 70 watts.

What remains of the predecessor is the so-called Super Rail topology, which works with voltage rails and a voltage increase in the sections in front of the output stage instead of “boring” conductor tracks. D’Agostino compares this principle with a turbocharger, which is supposed to drive the 48 power transistors in the output stage, supported by almost 100,000 microfarads of filter capacity and a 2000 VA power supply, to achieve even more advanced performance.

Dan D’Agostino Progression S350 Stereo Power Amplifier

Dan D'Agostino Progression S350Dan D'Agostino Progression S350 from the front

The Dan D’Agostino Progression S350 stereo power amplifier

The stereo power amplifier also benefits from the new transistor type, the super-rail concept and a powerful power supply. It delivers 350 watts into 8 ohms or 700 watts into 4 ohms. Last but not least, the optics are remarkable: one inevitably thinks of a cross between a porthole and a Swiss precision watch when looking at the prominently displayed level meters with two needles. The two pointers (logically only one on the M500) are moved by a “high-speed circuit” in order to display the power output in each case as precisely as possible and without delay.

Dan D'Agostino S350 back with XLR connector

Dan D’Agostino Progression S350: Access is only permitted to a balanced XLR connection

The amps, which incidentally both weigh a good 52 kilos and can only be charged via an XLR connector, are available in silver and black as standard.

Prices (pieces):
Dan D’Agostino Progression M550: 30,000 euros
Dan D’Agostino Progression S350: 34,900 euros

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