The Pro iESL First among energizers The Pro series iESL is an unsurpassed energiser 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 three 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 Specifications Maximum Output voltage: 640V RMS (16Ω/20V in) 320V RMS (64Ω/20V in) Frequency Response: 5Hz – 50kHz (-3dB) Input Voltage (Pro iESL): 5V – 9V/1A max Input Voltage (iPower): AC 85 – 265V, 50/60Hz Power Consumption: < 1W Dimensions: 213(l) x 206(w) x 63.3(h) mm Weight: 2.5kg (5.5 lbs) The retail price of the Pro iESL is US$1,399 (ex-tax) or €1,575/£1,395 (incl VAT). Stay tuned, tech stuff coming up shortly!