As John Atkinson,Editor in Chief at Stereophile at the time, commented:
The immediate impression was of extraordinary clarity. This wasn't as if the edges of the objects within the soundstage had been enhanced, as can be done to images with PhotoShop, but as if the pixel count of the image had been increased. It didn't manage this by emphasizing treble detail, but to resort to an audio reviewer cliché, the DAC502 cleaned the window into the recorded soundstage to an impressive extent...
(U)ltimately, musical enjoyment is what this product is all about. As I write this conclusion, I am listening to Stanford's hauntingly engaging song "The Blue Bird," performed by the Gabrieli Consort directed by Paul McCreesh (from Silence & Music, 16/44.1k FLAC, Signum Classics/Tidal). The interplay between the unaccompanied voices, the bell-like interjections of the high soprano, the setting of all the singers within a supportive chapel acoustic—the Weiss DAC502 made all these aspects clear, in service of the music. Which is what a great audio component should do."STEREOPHILE, Jul 24, 2020
The Helios WEISS'S state of the art D/A converter with an unprecedented level of sophistication and versatility. With the Helios we are creating a new paradigm for what used to be a black box device."It's an 8-channel D/A converter with four DACs per channel," the younger Weiss explained. "The housing is fully anodized aluminum. The 502 that Stereophile reviewed also has four channels, but they're split between the speaker feed and the headphone feed. The Helios has four channels on the left and four on the right. What's most significant, however, is the unit's analog stage, whose new discrete operational amplifiers are of the utmost importance." A typical D/A Converter is a ”set and forget” device. Not so with the Helios. It adds a number of interesting signal processing features and sports a variety of digital inputs. Balanced, unbalanced and headphone outputs are provided. Weiss Engineering has a 30 year history in D/A Converter design. In that time span we have learned a thing or two about converter design. The Helios is the essence of our experiences