The Absolute Sound
Golden Ear Award 2017

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Editors Choice

The Absolute Sound
Editors Choice

Stereophile Product
Of the Year

Stereophile Recommended Components 2013
Class A

Design & Engineering 2011


MOMENTUM M400 Monoblock Amplifier

d'Agostino Momentum

The Momentum amplifier from Dan D'Agostino Master Audio Systems delivered magnificently on the initial design goals of formidable power and incomparable finesse from a compact chassis. Worldwide, reviewers, critics, and end users lauded the performance and elegant aesthetic design. Global praise included more than a dozen "best of" awards and the highest ever review scores for sound and measured performance.

The driving force behind the Momentum M400 design, Dan D'Agostino, is constantly creating and revising his thoughts on circuit design and their implementations. What started as an engineering exercise resulted in an exciting new breakthrough that Dan felt compelled to include in the Momentum amplifier. These efforts have led to a substantial upgrade in the new Momentum M400.

d'Agostino Momentum

The new M400 moniker gives clue to a major part of the upgrade. Power output has been increased to 400 Watts. This is up from the original 300 Watts. The backbone of the power increase is a new ultra-quiet 1,800VA linear transformer - a 20% increase in size from the original. Coupled to this larger power source is a new output stage design that includes a number of major enhancements.

The Momentum M400 employs the same chassis with a small aesthetic design change to the copper feature on the faceplate sides. Additionally, the meter now displays a scale appropriate for the greater output. With the Momentum M400, Dan has once again elevated the state of the art in amplifier design.

No other amplifier looks like the Momentum. No other amplifier sounds like the Momentum.

Inspired Design


The warm glow of its polished copper heat sinks complements the visual focus of the amp. The illuminated front power meter celebrates the design of classic watch faces and features the signature of Dan D’Agostino. Inspired by the clean, no-fasteners look of the iPhone and iPad, the entire amplifier is assembled from the bottom, so there are no visible screws on the front, top and sides

Revolutionary Cooling

The Momentum is the first production amplifier to use copper for its heat sinks. The thermal conductivity of copper is 91-percent greater than that of aluminum, allowing the Momentum to use a much smaller heat sink.

To further enhance cooling capacity, the heat sink uses venturis instead of fins. The mouths of the venturis measure 0.75 in (1.9cm), and they narrow to 0.5 in (1.2 cm) in the middle. As the air in the top of the venturis heats and expands, the shape of the venturis forces it upward and draws more air in from the bottom. The venturi-equipped copper heat sinks make the Momentum’s compact, 5.25-inch-high chassis possible.


Energy-Efficient Design

Most high-end audio amplifiers consume hundreds of watts of power the moment you push the “On” button—even when they’re idling and reproducing nothing but silence. With the Momentum amplifier, Dan D’Agostino has achieved a new standard in energy efficiency for the high-end audio industry. Despite its impressive output of 400 watts per channel into 8 ohms, the Momentum draws less than 1 watt of power at idle—or about one fifth of what a typical cell phone charger might require.

High-Speed Transistors

The 28 output transistors used on the Momentum are among the fastest high-output transistors available. They run at a blistering 69 MHz, permitting D’Agostino to achieve incredible bandwidth. Each transistor mounts with two stainless steel fasteners—a rarity among flat-package transistors—for maximum thermal transfer to the copper heat sinks. A capacitor/resistor network connected to the base of each transistor ensures stability even at high frequencies and with low-impedance speakers.

A Build-Quality Benchmark

Hand-built and hand-tested in America, the Momentum’s chassis is machined from solid aluminum billet, not stamped from sheet metal. It is non-resonant and provides superior shielding from radio-frequency and electromagnetic interference (RFI/EMI).

The circuit board is assembled using through-hole construction, which resists heat (and stands the test of time) far better than the usual surface-mount boards can. Using through-hole construction also allows the use of higher-quality capacitors in the circuit. All resistors are 1% metal-film units. There are no capacitors in the signal path—the amplifier is DC-coupled from input to output.

POWER OUTPUT: 8Ω - 400 watts
4Ω - 800 watts
2Ω - 1600 watts
POWER BANDWIDTH: 1 Hz to 200 kHz, -1 dB
20Hz to 20 kHz, ±0 dB
DISTORTION: 0.1% @ 1 kHz 400 watts @ 8Ω
SIGNAL TO NOISE RATIO: 105dB, unweighted
INPUTS: 1 balanced XLR
DIMENSIONS: 12.5"(31.7cm) x 21.5"(54.6cm) x 5.25"(13.3cm)
WEIGHT: 95 lbs. (43 kg)

Audio Research
Momentum M400 mono  159 710 zł     cena zawiera KGO: 6,30 zł
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D'Agostino Momentum The Absolute Sound 01/2014

HiFi Advice 04/2013

Unfortunately, there is no audio term for the ability to produce a fully enjoyable sound over time. It isn’t just a matter of avoiding listening fatigue; it is the ability to keep you engrossed in the music. These are not a preamp and amplifiers to read by or use for background music. With equally good associated components, they pull you into the music and the performance and they keep you there.

Anthony H. Cordesman

full review »

Dan D''Agostino Momentum monoblock power amplifier

Stereophile 2/2013

I've heard more clinically precise amplifiers, and ones that produced more digital-like black backgrounds, but, other than the darTZeel, none that could produce such a "meaty," well-proportioned, consistently enticing sonic picture.

Dan D'Agostino's Momentum is clearly his best design yet. With the darTZeel NHB-458, it's one of the two most satisfying power amplifiers I've ever heard.

Michael Fremer

full review »

HiFi News 07/2011

 HiFi News 07/11

The lone solid-stater amidst valves, the Momentum is enough to make you get religion. It may, perhaps, be the best amp on the planet.

Ken Kessler

full review »

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