Audacious Audio

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. It's not just that Piet Grimm, a professional pilot for the Dutch air defense, had a pair of very fine Infinity speakers, a Pioneer receiver, and a Technics turntable. Others surely did, too. It's more that he purchased the system from a military PX shop at a US air force base in Germany, then happily flew the equipment home to the Netherlands on his Northrop F5 supersonic fighter plane. That's not run-of-the-mill cool, that's Top Gun cool.

Years later, Eelco, too, started taking stereo gear to new altitudes, becoming a designer of high-end speakers and electronics. After Grimm Audio, a 15-person enterprise, moved to a building near Eindhoven airport in the southern Netherlands, he realized that it stands in almost the exact spot where his dad used to park his fighter jet.

In my enthusiastic 2022 review of the Stromtank S-1000 ($16,900), I described the Stromtank as a computer-controlled lithium iron phosphate (LiFePO₄) battery array that, coupled with its AC inverters and all the trimmings, supplies clean, constant, stable off-grid AC power to hi-fi components. By softly depressing a single button on the front panel, Stromtank owners can easily switch from wall-connected mode (when the Stromtank's dimmable front-panel meter is blue) to a disconnected, battery-only state (when the meter is green). At the end of a listening session, users can return to blue mode to recharge the battery array.

What if there was a character in Stanley Kubrick's classic movie 2001: A Space Odyssey who was an audiophile? Aboard the Discovery One interplanetary space ship, what would his system look like? He'd probably have a pair of ultramodern speakers that could pluck sound out of the ether. He'd control the system with something like a present-day smartphone or tablet, commanding the HAL 9000 computer to play his favorite songs. The speakers would stand unobtrusively in a white room with 1970s modern-minimalist furniture, no rack of components to drive them, no wires connecting them, no shelves of physical media to play. And they would fill the room with music.

I am sitting earthbound in my living room almost a quarter-century beyond the year 2001, living a similar scenario with the Focal Diva Utopia streaming amplified wireless speaker system. My living room is not at all reminiscent of the Discovery One with its rotating central interior (footnote 1). But with the Diva Utopia system, I feel more in a sci-fi future young me might have imagined than with any hi-fi component I've reviewed so far. About the only thing the Diva Utopia has in common with the stereo systems I grew up with—and with my current reference system—is two floorstanding cabinets and diaphragms that move air to make sound.

Almost 14 years have passed since a review of a Soulution product appeared in the pages of Stereophile. Given the Swiss company's steady ascent in the high-end pantheon, it is high time that we again reached into the German-speaking region of Switzerland north of the Swiss Alps to evaluate another of the reference products from a company equally renowned for its sonic achievements and refined and elegant design aesthetic.

Enter the full-function Soulution 727 preamplifier ($74,975), whose optional MC/MM phono section ($11,975) will be evaluated in a future issue. Because Soulution claims that the 727 "sets benchmarks in terms of noise, phase errors, common mode rejection and distortion," one would hope that there's far more than 62lb of classy casework and an easy-to-handle lightweight remote to account for its price.

Since the original WATT/Puppy concept kicked off in the late 1980s, there has been a 40-year evolution leading to the latest version reviewed here. The loudspeaker's price in 2025 is around $40,000/pair compared to the original's $8000. While inflation alone would have lifted the price to $25,000/pair, the current price takes into account the many technological and design improvements. While remaining physically separable, the upper "WATT" (Wilson Audio Tiny Tot) component, namely the head unit of the latest design, can no longer be run as a small full-range loudspeaker in its own right. This is because the mid/treble crossover, which was originally in the WATT, is now relocated to the lower "Puppy" section. Certainly, that original two-box "full range," strongly sculpted WATT/Puppy stack radically broke the mold in deviating from those rather plain, coffin-shaped tower loudspeakers that were popular in this category.

The late David Wilson originally created the WATT as a shelf-mount studio monitor to help produce his recordings. At the time, this compact two-way promised near–state-of-the-art sound quality, especially transparency, indicative of very low self-noise. This quality also helped to maximize dynamic range and contrast. Later, David used the WATT as the foundation for a three-way floorstanding design by matching it to a low-frequency system (the Puppy), which also stood in as a physical platform for the WATT. This idea became reality in the successful W/P line of bass augmented systems.

No fewer than eight boxes, powered by six after-market power cables, comprise my current reference front-end. As much as separate boxes can afford superior isolation and provide far more room for visionary engineers to work their magic, the advantages of a single box, which requires a single power cable and far fewer after-market interconnects, are obvious.

Enter Simaudio's Moon 891 network player/preamplifier ($25,000; footnote 2). Also called a "streaming preamplifier,"it includes a DAC that converts PCM and MQA files up to 32/384 (with 24-bit files upconverted to 32-bit) and DSD files up to 256. It also includes what Simaudio company co-owner Costa Koulisakis describes as "a fully configurable" MC/MM phono stage. Both theoretically and practically, it's an ideal solution for someone with space and/or budget constraints.

What's in a name? Denmark-based Gryphon Audio Designs laid down a marker when company founder Flemming Rasmussen chose that name in 1985. Browsing through the current Stereophile Recommended Components list, I only found one other manufacturer that utilizes an animal moniker. The imagery summoned by the use of the mythical treasure-guarding Gryphon seems appropriate; a hybrid creature combining features of the eagle and the lion, creatures of strength and speed—this choice underlines some of the aesthetics and performance Gryphon Audio has become known for. The handsome hardcover user's manual for the Diablo 333 simply states in gold "The Gryphon," along with a side-on profile of that winged lion-tailed creature, as a logo.

The Gryphon Diablo 333, a solid state, stereo integrated amplifier ($24,900 without optional DAC and phono stage modules), replaces the Gryphon Diablo 300, which was in production since 2016.