This review page is supported in part by the sponsors whose ad banners are displayed below This review first appeared in the April 2012 issue of hi-end hifi magazine High Fidelity of Poland. You can also read it in its original Polish version here. We publish its English translation in a mutual syndication arrangement with publisher Wojciech Pacula. As is customary for our own articles, the writer's signature at review's end shows an e-mail address should you have questions or wish to send feedback. All images contained in this review are the property of High Fidelity or Okutsu Denko Co. - Ed Reviewer: Wojciech Pacula CD player: Ancient Audio Lektor Air V-edition Phono preamplifier: RCM Audio Sensor Prelude IC Cartridges: Miyajima Laboratory Shilabe & Kansui Preamplifier: Ayon Audio Polaris III Signature with Regenerator power supply Power amplifier: Soulution 710 Integrated amplifier/headphone amplifier: Leben CS300 XS Custom Loudspeakers: Harbeth M40.1 Domestic + Acoustic Revive custom speaker stand Headphones: Sennheiser HD800, AKG K701, Beyerdynamic DT-990 Pro 600Ω vintage, HifiMan HE6 Interconnects: CD/preamp Acrolink Mexcel 7N-DA6300, preamp/power amp Acrolink 8N-A2080III Evo Speaker cable: Tara Labs Omega Onyx Power cables (all equipment): Acrolink Mexcel 7N-PC9300 Power strip: Acoustic Revive RTP-4eu Ultimate Stand: Base IV custom under all components Resonance control: Finite Elemente Ceraball under CD player, Audio Revive RAF-48 platform under CD player and preamplifier, Pro Audio Bono PAB SE platform under Leben CS300 XS Review component retail: €2.250 Air-PC/1.5m, €3.600 Ai-EX Prior to this review I didn’t know Okutsu Denko Co. from Adam. I had no idea they even existed. In Japan they are quite well known as it turns out. The company specializes in power supply systems and entered the audio world in 2005 with the Air Cable brand. The pretext was the development of a new power cable geometry around an air dielectric. The concept per se is not new—we may recall the American Tara Labs company for one—but its particular realization by Okutsu Denko is innovative. The cables consist of four Teflon tubes centered around a central copper drain. Two of these tubes house copper conductors which aren’t straight but wavy to minimize contact with the surrounding tubes and prevent internal movement. Shielding consists of three layers - copper tape, carbon fiber mesh and braided copper. The tubes are held in place with braided silk. Conductor purity remains unspecified. The company presently offers four power cords of which I received the two top models for review. The Extreme sports a smooth transparent finish like Acrolink and a purple braid underneath. It is terminated with Oyaide 079 plugs tucked into custom casings of nicely finished Titanium. The less expensive Prestige with a blue mesh has aluminium plug housings.