Weighing 95lb, it is smaller and lighter than its entry-level sibling, the more powerful, 125lb Progression M550 Mono amplifier ($47,500/pair), and is veritably dwarfed by some other monoblocks, including the flagship D'Agostino Relentless Epic 1600 (5701b) and the Karan Acoustics POWERa mono (231lb), which I reviewed last month. But if the M400 MxV's rock-solid look and feel and its exquisite aesthetics-a sleek amalgam of silver and copper fronted by a power meter that glows green and radiates Rolex quality-are any indication, a helluva lot is going on beneath its showy exterior.
Once I took a listen, I discovered sound so smooth and satisfying that the refrain "How ya gonna keep 'em down on the farm / After they've seen Paree," from a WWIera song about soldiers not wanting to return to their family farms after experiencing big city life in Paris, kept playing on repeat in my head.
Direct from Cave Creek
What kind of amplifier is this that distracted me so from watering the cows and milking the chickens? D'Agostino's website² offered a few clues. The Momentum M400 MxV is hand built; it includes discrete, direct-coupled, balanced circuitry and boasts a "new, ultra-quiet 2200VA linear transformer" with a winding scheme that is said to reduce the hysteresis effect by 90%, minimizing power and thermal loss. The new winding method also plays a role in increasing current capability by more than 50% and "offer[ing] greater headroom during dynamic passages," which is surely aided by a bank of nearly 100,000μF of supply capacitance. All that adds up to potential output power of 400, 800, and 1600W into speaker loads of 8, 4, and 2 ohms, respectively.
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Denne historien er fra June 2023-utgaven av Stereophile.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
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Philharmonic Audio BMR Monitor
Let's get this out of the way: The BMR Monitor may be a monitor, but it isn't a bookshelf or desktop speaker any more than a yacht is a dinghy.
Technics SC-CX700 ACTIVE LOUDSPEAKER
The usual Specifications box (below) is a nuts-and-bolts listing of the electrical and physical properties of the Technics SC-CX700 loudspeaker, who made it and where, and a widely varying amount of information about their electrical and acoustical performance. The information comes from the included literature, available downloads, and whatever I could find on the manufacturer's website.
Youth movement
Paul Klipsch was a genius,” Roy Delgado told me recently, with the sound of genuine amazement in his voice. “Me, I’m just a tinkerer.”
The Loricraft PRC6i record cleaning machine and the WallySkater v2.1 Pro
In my last Spin Doctor column, I gave an overview of my experiences cleaning records over the last 50-plus years and the advances in record cleaning technology over that time. My review of the HumminGuru NOVA ultrasonic record cleaner focused on that increasingly popular approach to record cleaning, using ultrasonic cavitation instead of scrubbing the record with a brush. But if there’s one thing I’ve learned in that half-century of playing around with audio gear, it’s that it can be a mistake to embrace a new technology just because of its newness, dismissing what came before as obsolete. The vinyl record itself is a good example of a technology discarded as obsolete, then embraced again by new (and old) generations. You can add vacuum-tube amplifiers, analog tape, and much else in our hobby to that list.
Wattson Audio Madison LE Streamer
After it was delivered, I weighed the box containing Wattson Audio's DAC-equipped Madison LE Streamer on my bathroom scale.
Grimm Audio LS1c ACTIVE LOUDSPEAKER SYSTEM
It's not unusual for audiophiles to have fond childhood recollections of the old family stereo, but Eelco Grimm's memory of his dad's audio system probably stands alone.
Cambridge EXN100 STREAMING D/A PROCESSOR
Each soloist seemed to pop out to the front, between the two speakers (of course), their life force emerging over decades, grooves, and digital bits.
J.Sikora Standard Max Supreme, KV9 Max Zirconium
In his review of the J.Sikora Initial turntable, Stereophile's resident artist/sage Herb Reichert wrote, \"Extended bathing, lighting candles, making tea, and preparing food are ritual work forms that prepare my senses to accept both pleasure and illumination.\"
The Voxativ Hagen2 Monitor loudspeaker
I think I just found the perfect Herb speaker. It uses a hand-crafted 5\" wide-range driver with a cone made from Japanese calligraphy paper. It rolls off around 50Hz at the bottom and 30kHz at the top. It has no crossover. Its cabinet is made of MDF that responds loudly when I tap it with my fingernails. Inside is what its designer calls a “short horn,” which appears to harmlessly disperse back-cone energy while adding energy below the driver’s cutoff frequency. Mainly, though, it’s a perfect Herb speaker because it is naturally phase coherent. And sparkplug fast. And completely unmuffled.
The Beatles in Mono according to Kevin
It's almost too easy to make Dave Dexter Jr. the villain in the story of the Beatles' fumbled introduction to America.
