Audiophilepure

https://www.soundstageultra.com/index.php/equipment-menu/937-gryphon-audio-designs-zena-preamplifier

The Zena’s visual design and build quality, the beauty of its display, the attractive owner’s manual, the inclusion of gloves and polishing cloth, and the quality of its packaging all indicate that Gryphon Audio Designs is more concerned with delivering a premium customer experience than with wringing the last dollar of profit from its products.

Per Gryphon, each sample of the Zena is burned in at the factory for 48 hours; they say that the sound quality further improves after 40-50 more hours of use. The Zena comes with a three-year, nontransferrable warranty on parts and labor. That’s common for high-end audio components, but in my opinion, anything less than five years is too short.

https://www.stereophile.com/content/dan-dagostino-master-audio-systems-momentum-hd-line-preamplifier

“I briefly switched DACs and used a single S/PDIF cable from the dCS Network Bridge to convey signals from the Roon Nucleus+ to the EMM Labs DV2. With the Momentum HD preamp controlling volume, I heard more air around Cassandra Wilson and Rickie Lee Jones’s voices and accompaniment, but a bit less midrange profundity. After realizing that the comparison was flawed due to setup constraints—I’ve since moved equipment around on my eight-shelf double rack so I don’t run into this problem in the future and sent the DV2 back for a major upgrade—I acknowledged that a valid comparison between the two DACs would have to wait.

When I returned to the Rossini DAC/Momentum HD preamp combo, revisiting Cassandra Wilson’s performance revealed a complexity of string tone, deep bass grind, and increased color contrast and depth that, compared to what I heard from either DAC alone, left me in awe. Adding the preamp delivered Rickie Lee’s creepy vocals with much more subtlety and intimacy, and markedly greater dynamics, even at low volume. I didn’t want the music to end.”