11 July 2017
- Latest News / Press
iFi Pro iESL
iFi Pro iESL

The Pro series iESL is an unsurpassed energizer for electrostatic headphones (and transformer-coupled stage for flagship dynamic headphones too).

The Pro iESL driven by either the iFi Pro iCAN or a powerful amplifier takes electrostatic headphones to an unprecedented level of performance.

Its defining characteristic is a transparency and an ultra-wide dynamic range that is totally natural. The Pro iESL works with Stax, Sennheiser Orpheus and many more.

Classic & Cutting Edge Technology

The Pro iESL’s two key elements combine the very best in classical approaches with the latest in cutting-edge technology AND superb component quality to deliver the ‘perfectly matched’ headphone experience.

    •    Atypical Pinstripe Permalloy Core transformer 

    •    Bias voltage generator 

    •    Capacitive Battery Power Supply 

Outstanding Component Quality

    •    One-off, hand-wound, Pinstripe Permalloy Core Transformer 

    •    Wima Capacitors 

    •    Vishay MELF resistors 

    •    Gold-plated silver and sealed-silver alloy contact relays 


Maximum Output voltage: 640V RMS (16Ω/20V in)
Frequency Response: Input Voltage (Pro iESL): Input Voltage (iPower):
320V RMS (64Ω/20V in) 5Hz – 50kHz (-3dB)
5V – 9V/1A max
AC 85 – 265V, 50/60Hz
Power Consumption: Dimensions:
213(l) x 206(w) x 63.3(h) mm 2.5kg (5.5lbs)

The retail price of the Pro iESL is US$1,399 (ex-tax) or €1,575/£1,395 (incl VAT).

iFi Audio website

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