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Dan D'Agostino Momentum M400 MxV monoblock power amplifier Page 2

Sonic and musical epiphanies
I had certain expectations about what I would hear when I began my audition. I anticipated that the Momentum M400 MxV would have a similar top-to-bottom sonic signature to the Progression M550 but that its bass would be less impactful, less dynamic. Most differences, I expected, would probably be best described as refinements of that house sound Dan had mentioned. Considering that the Momentums cost some $30,000 more than the Progressions, I hoped for a great deal of refinement.

I'm always amused when my expectations are proved wrong. The strength…

Dan D'Agostino Momentum M400 MxV monoblock power amplifier Specifications

Sidebar 1: Specifications

Description: Solid state, fully balanced class-AB monoblock power amplifier. Inputs: 1 pair balanced (XLR). Outputs: 1 pair binding posts. Power output: 400W into 8 ohms (26.0dBW), 800W into 4 ohms (26.03dBW), 1600W into 2 ohms (26.04dBW). Frequency response: 1Hz–200kHz, –1dB 20Hz–20kHz, ±0.1dB. Input impedance: 1M ohm. Output impedance: 0.11 ohm. Signal/noise ratio: 115dB, unweighted. Distortion at 400W, 1kHz into 8 ohms: 0.09%.
Dimensions: 12.5" (317mm) W × 21.5" (546m) D × 5.25" (133mm) H. Weight: 95lb (43.1kg).
Finish: Silver or black with copper trim…

Dan D'Agostino Momentum M400 MxV monoblock power amplifier Associated Equipment

Sidebar 2: Associated Equipment

Digital sources: dCS Vivaldi Apex DAC, Vivaldi Upsampler Plus, and Vivaldi Master Clock; Innuos Statement NextGen Music Server; Uptone Audio EtherRegen, AfterDark Giesemann Emperor Double Crown Master Clock, and Nordost QNet Ethernet Switch, all powered by Nordost QSource linear power supplies (2); Synology 5-bay 1019+ NAS, Small Green Computer Sonore Deluxe opticalModule, Linksys mesh router and Arris modem, all powered by HDPlex 300 linear power supply; Apple 2017 iPad Pro and 2017 MacBook Pro laptop with 2.8GHz Intel i7, SSD, 16GB RAM.
Preamplifier:…

Dan D'Agostino Momentum M400 MxV monoblock power amplifier Measurements

Sidebar 3: Measurements

Before I tested one of the Dan D'Agostino M400 MxV amplifiers, serial number 5879, with my Audio Precision SYS2722, I preconditioned it by following the CEA's recommendation: I ran it at one-eighth the specified power into 8 ohms for 30 minutes. At the end of that time, the side-mounted heatsinks were hot, at 106.1°F (41.2°C), and the top panel was hotter, at 110.5°F (43.7°C). After testing the amplifier at high powers, the temperature of the top panel had risen to 120.4°F/49.1°C. The M400 MxV needs to be well-ventilated.

The D'Agostino's voltage gain was…

AVM Inspiration CS2.3 CD receiver

In the 1960s, my dad gave me a Panasonic receiver with two cube speakers, just in time for the advent of FM stereo radio in the San Francisco Bay Area. Out of the blue one night, he just walked in with it. The receiver allowed me to plug in a record player, though I only had a few LPs. Later, when I went off to college, my mom took me shopping for a new stereo. I chose a Kenwood integrated amplifier—without a tuner but with the capability to plug in a tape deck, which I did. During my undergrad years, it served me well. Later, I switched to an NAD receiver, which allowed me to listen to the…

AVM Inspiration CS2.3 CD receiver Page 2

In the capability and flexibility of its digital platform, the Inspiration CS 2.3 hunts with the big dogs. I asked John Woo of Bluebird Music, distributor for AVM in North America, to describe the capabilities of the AVM X-STREAM Engine, which is new for the CS 2.3 model; X-STREAM is a powerful digital processor/controller, powered by an ESS 9038Q2M chip. He told me that the CS 2.3 supports hi-rez streaming up to 24/192 and DSD 256 natively. It is Roon capable and supports Tidal Connect (but with no MQA support), Spotify Connect, Qobuz, and AirPlay 2. All are accessed with the AVM RC X…

AVM Inspiration CS2.3 CD receiver Specifications

Sidebar 1: Specifications

Description: Solid state, class-D, stereo streaming integrated amplifier with DAC, CD transport, phono preamp, class-A headphone amplifier, remote. Analog inputs: 4 pair RCA (2 line, phono, phono loading). Digital inputs: HDMI ARC, USB-A, LAN, 2 Coax, WLAN, Bluetooth antennas. Analog outputs: 1 pair RCA variable, 1 pair RCA fixed. Loudspeaker outputs: stereo pair 3-way binding posts. 1/8" (3mm) unbalanced headphone. Input sensitivity: 275mV. Power output: 140Wpc (18.45dBW) at 1% THD+N into 4 ohms. Tone controls: Balance, Bass, Treble, Loudness. Standby power…

AVM Inspiration CS2.3 CD receiver Associated Equipment

Sidebar 2: Associated Equipment

Analog sources: Pro-Ject Debut Carbon-EVO turntable, Sumiko Rainier & Sumiko Olympia cartridge.
Digital sources: Cary Audio 308T CD player, Musical Fidelity M1CDT transport.
Integrated amplifiers: Peachtree Audio Nova integrated, McIntosh MA252 Tube Hybrid integrated.
Loudspeakers: Sonus Faber Toy, Harbeth C7 ES-3 XD, REL T2 subwoofer.
Headphones: AudioQuest Nighthawk, Sennheiser HD 560 S.
Cables: Interconnects: AudioQuest Cobra & Sky. Speaker: AudioQuest Rocket 88 & Robin Hood.
Accessories: Mapleshade equipment rack,…

AVM Inspiration CS2.3 CD receiver Measurements

Sidebar 3: Measurements

I measured AVM's Inspiration CS 2.3 using my Audio Precision SYS2722 system,1controlling the amplifier with the AVM RC X app on my iPad mini. As the AVM is a class-D design, and class-D amplifiers emit relatively high levels of ultrasonic noise that would drive the analyzer's input into slew-rate limiting, all the measurements other than frequency response were taken with Audio Precision's auxiliary AUX-0025 passive low-pass filter. (The AUX-0025 mitigates noise above 80kHz and eliminates noise above 200kHz.) Without the filter, there was approximately 400mV of…

The Home Entertainment Show Opens Today in Costa Mesa, CA

I had to pause for a moment when I saw the cover of the show guide. Could T.H.E. Show, aka The Home Entertainment Show, which opens today in the Hilton Orange County in Costa Mesa, really be North America's longest-running HiFi Audio Show?

Then it hit me. When I first started attending audio shows, there were only two big games in town: the late and lamented Stereophile Show, which moved around the country, and CES in Las Vegas. Nor was CES a monolith. For many of us, the parts of CES we loved the most and flocked to were not the exhibits in the jam-packed, noisy Las Vegas Convention…