“no turning back”

In the renowned hi-fi magazine "Hörerlebnis," Marco Kolks extensively tested the impressive Vortex HiFi HFO Plugs Sigma. The author emphatically emphasizes that high-quality music reproduction must achieve one thing above all else: "evoke emotions within us." This is precisely where the HFO Plugs Sigma come in, by specifically minimizing high-frequency (HF) interference, which, according to Kolks, are the biggest "sound devils" in the home listening room.

Kolks emphasizes that most sources of interference, from computers to microwaves, "can be found in one's own home, if not in one's own hi-fi system." The unique effect of the Sigma HFO Plugs results primarily from the specially designed small antenna, whose position, while unimportant to the sound, is crucial for the effect: "If you unscrew the antenna from the base, most of the effect disappears."

In practical listening tests, Kolks noted an impressive improvement, which is primarily evident in a striking sense of spatiality. "Depth layering, localization, and image size are more precise, more contoured, and much more three-dimensional," Kolks describes the sound experience. He particularly emphasizes the emotional depth created by using the plugs: "With the HF optimizers, you can feel the depth of soul in every single note."

Kolks was also impressed by the mastery with which subtle musical differences are brought out: "Perhaps the greatest merit of the HFO Plugs Sigma is that the notes literally blossom and fade away as if on a live stage." According to Kolks, this applies not only to excellent new recordings, but surprisingly also to older recordings.

Finally, Kolks enthusiastically concludes that for those who have experienced the sound with Sigma's HFO plugs, "there's no going back." The Vortex products not only make music sound better, but also ensure that you float on a "proverbial Vortex cloud," enabling audiophile enjoyment far beyond "what you expect from purchasing new equipment."

Here is more information:

https://youtu.be/AXdABFw6BNs?si=Lo8TjtUVsDzq5dAP

Read the full review here:

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