NEW IFI AUDIO PRO IESL HEADPHONE ENERGISER FOR ELECTROSTATIC/DYNAMIC HEADPHONES


The Pro series iESL is an unsurpassed energiser for electrostatic headphones (and a transformer-coupled stage for flagship dynamic headphones too). The Pro iESL driven by either the iFi Pro iCAN or another 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 three key elements combine the very best in classic approaches with the latest in cutting-edge technology. 


Atypical Pinstripe Permalloy Core Transformer
Bias Voltage Generator
Capacitive Battery Power Supply
Outstanding Component Quality
And superb component quality delivers the 'perfectly matched' headphone experience. 

One-off, hand-wound, Pinstripe Permalloy Core Transformer
Wima Capacitors 
Vishay MELF resistors
Gold-plated silver and sealed-silver alloy contact relays

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