Search for perfection

Maintaining a healthy environment for your audio or AV system is essential. IsoTek’s multi-award-winning Select range guarantees to provide your system with pure power, ensuring that you achieve the best possible audio quality whenever you listen. Ownership of a Select product will maximise your musical enjoyment through innovative proprietary technologies, which have been independently acknowledged to be the finest money can buy and endorsed by numerous magazine reviews and awards not only in the UK but also throughout Europe, America and the Far East.

YOUR SYSTEM VALUE: £12,500 – £30,000



The EVO3 Sigmas is the bigger brother of our highly respected EVO3 Aquarius. Again offering 4 medium power outlets, now rated at 10A and 2 high current 16A, driven by a light version of the Titan’s Direct-Coupled© circuit. It represents an extremely cost effective full system upgrade.

  • Removes both Common Mode and Differential Mode mains noise.
  • RFI reduction 75dB
  • Six unique conditioning stages ensure optimal isolation between all outlets.  Two high-current outlets incorporate part of Titan’s Direct-Coupled© circuit.  Four outlets feature IsoTek unique Adaptive Gating© circuit, which auto-senses the load.
  • LED Display showing voltage and THD distortion of the mains.
  • KERP© (Kirchoff’s Equal Resistance Path) ensures equal resistance and equal power delivery across all outlets.
  • 108,000A of instantaneous protection.
  • Internal wiring; solid core silver plated PCOCC with FEP virtually an air dielectric.
  • Two high-current outlets delivering 3,680W continuous.  Four medium-current outlets delivering 2,300W continuous.
  • Available with UK, EU, US, Australian, Swiss and South African outlets.


  • High current transient ability through the two dedicated high current outlets (16Amps)
  • Suitable for all audio or AV components
  • Compact and elegant rack width design
  • Full system upgrade
  • Supplied with IsoTek’s award winning Premier power cable
  • UK, EU, US, Australian and Swiss specifications available


IsoTek’s EVO3 Sigmas represents a significant step up from our award winning Aquarius. Sigmas features a lightversion of the Titan’s high current Direct Coupled Design technology, allowing for low impedance high current delivery to two dedicated outlets. These are specifically designed for power amplifiers, active loudspeakers or sub woofers.

A further four outlets are dedicated to all other (front end) equipment, CD player, music server, projector, pre-amplifier, etc.

Sigmas is an easy to install full system upgrade, improving a systems sound stage with increased three dimensional imaging, bass articulation and control are also improved, with a sense of extended frequency range and openness.

Housed in a striking steel and machined aluminium chassis, Sigmas is the perfect upgrade for all high quality audio systems.


Number of outlets6
Type of outletsUK, EU, US, AU, CH
DisplayVoltage / THD / off
Mains inlet16A IEC C20
Mains voltage100-240V / 50-60Hz
High current

(Continuous) 16Amps (3,680W)
(Transient) 7,360W

Medium current10Amps (2,300W)
Dimensions445 x 90 x 305mm (W x H x D)


“The improvements in every aspect of the (connected) equipment’s performance are so obvious that it is a complete ‘no-brainer’.  An essential purchase, Outstanding.”
Hi-Fi World 2019

“The sound in the upper register becomes ordered and calm, the lower band bass denser. In the middle there is added brightness, but at the same time revealing a lot of new tonal colours. Sound as a whole becomes more pleasant and interesting.  EVO3 Sigmas gets our ‘Experts Choice Award’.”
Audio Video – April 2017

“I cannot imagine a serious high-end system in the high-end price bracket without an EVO3 Sigmas.  The perfect installation for music reproduction should always be built around the Sigmas because it is the heart of a high quality system.”
i-fidelity – May 2016

“IsoTek is producing state-of-the-art power devices.  I can emphatically recommend the IsoTek EVO3 Sigmas.”  (Read more…)
The Absolute Sound Magazine, America – June 2015

“There are very few products that can deliver improvement across the board to a multiple unit system, but this is very definitively one of them. If you are looking for a wholesale boost to your system, the EVO3 Sigmas is it”.
Hi-Fi Choice Magazine

Reviews for EVO3 Sigmas

Distributor Downloads

Hi-res Images

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EVO3 Sigmas Back

EVO3 Sigmas Product

Sigmas Hero Stack

Sigmas Stack Angled

Sigmas Stack Angled 2

Sigmas Stack Straight

Silver Sigmas 1

Silver Sigmas 2





Experience the Select range live at your local dealer.



The new EVO3 Titan is a progression of IsoTek’s original multi-award winning design and offers the ultimate high current/ power conditioner in the smallest form factor.

Read more



“I can no longer imagine a serious high-end system without IsoTek’s EVO3 Sigmas. Test Verdict: Outstanding.”
i-fidelity, Germany – March 2016