IsoTek V5 Sigmas in the areadvd review: “perfect for a high-end audio system”

In September 2026, online magazine areadvd.de puts the V5 Sigmas mains filter from British power-conditioning specialist IsoTek through its paces – and concludes: “With its elaborate construction, first-class material and build quality, and well-thought-out overall concept, the IsoTek V5 Sigmas helps to get the very best out of excellent audio components.”

“More clarity, greater detail and an extremely precise soundstage – many people will now raise an eyebrow and ask themselves: all that because of a mains filter? Contamination and interference in the power grid can be measured and verified. And just as good room acoustics and careful matching of components contribute to achieving maximum sonic performance, so too does a power filter. In high-quality systems, its use therefore definitely pays off. It is not something you hear immediately – the benefits of a device such as the IsoTek V5 Sigmas become apparent more when listening closely: you are presented with more nuances, perceive greater transparency and, overall, gain an increased sense of control. It is precisely these subtleties, which matter so much to highly demanding listeners, that suddenly come to the fore.”