IsoTek V5 Syncro Uni 16: Tuning tip from i-fidelity.net

In June 2025, the online magazine i-fidelity.net reviews the IsoTek V5 Syncro Uni 16, a filter component designed to remove unwanted DC elements from the mains voltage:

“Trying it out makes things clearer. We find that Rebecca Pidgeon initially performs her classic ‘Spanish Harlem’ with a slightly hoarse voice, while the double bass provides a timid accompaniment that we are not accustomed to and that creates a sense of unease. The V5 Syncro Uni is then brought into play, and a few subtle details change: the voice is positioned much more clearly and with greater body in front of the microphone, the double bass sounds deeper and more energetic, and the nervousness previously noticeable particularly in the piano and guitar has disappeared.

Especially with such sensitive aspects as the power supply of a hi-fi system, we repeatedly hear system owners confidently claim before an A/B comparison that they will not be able to hear any difference. But just as we are able to distinguish between different voices, the same applies in a test like this. Either the sound improves, or it does not. It is important, however, to remember that the difference a V5 Syncro Uni can make does not lie in turning poor-sounding components into good ones. Instead, its use ensures that inherently musical CD players, preamplifiers, integrated amplifiers or power amplifiers are able to deliver their full performance audibly-