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iFi - Pro iESL Electrostatic Headphone Energizer

Headphone Amp

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Drive Your Electrostatic Headphones to the Max and Use with a Headphone Amp: iFi Pro iESL Energizer Charges Your 'Phones, Supplies Needed Extra Voltage, Yields Incredible Transparency

Drive your electrostatic headphones with the iFi Pro iESL Electrostatic Headphone Energizer and experience the phenomenal transparency, ultra-wide dynamics, and natural musicality for which the style is renowned. Offering perfect bias, impedance, and termination matching with every electrostatic ‘phone around, Pro iESL paired with a high-end headphone amplifier supplies the proper extra-high-tension voltage required by electrostatic headphones – something conventional amplifiers cannot offer. Pro iESL "energizes" the electrostatic plates in your ‘phones, giving them the power they need to operate at peak potential. A hand-wound permalloy core transformer, capacitive battery supply, and bias voltage generator do the work so all you have to do is listen to what you've been missing. iFi Pro iESL is the flagship your electrostatic need and deserve. 100% Music Direct Guaranteed.

Please note: iFi Pro iESL is strictly for use with electrostatic headphones and needs to be paired with a headphone amplifier.

Pinstripe Permalloy Core Transformer (PPCT)
Making a transformer with the wide bandwidth and low distortion needed in iESL makes for a very challenging proposition. iESL's custom transformers use complicated hand-wound, multi-section windings with vertical and horizontal sectioning. They exceed the standards set by Siemans (Germany) and Peerless (USA). With a bandwidth of < 5Hz to > 60kHz (-3dB), transformers in the iESL far exceed the requirements of even the JAS High-Res Logo.

Capacitive Battery Power Supply
The battery supply is always charged up to the required voltage and then the charger circuit is turned off completely, leaving the capacitor bank to ‘float' at the required bias voltage. It's an essentially perfect bias voltage source with no electronic noise at any frequency. The headphones are, in essence, powered by the battery bank and not the mains.

Wima Capacitors
German-made, 1,000-volt rated Wima capacitors feature high insulation resistance and minimal current leakage. The whole capacitor pack has around 35,000,000 kiloOhm insulation resistance, meaning that self-discharge time (to 30%) is around 100,000 seconds, or 27 hours. This allows you to always listen on battery (not mains) power.

Vishay MELF Resistors
MELFs offer superior SMD resistor performance in terms of accuracy, stability, reliability, and pulse load capability. Cylindrical construction provides the optimal power rating and pulse load capability need for iESL.

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 (DWH): 8.4" x 8.1" x 2.5"
Weight: 5.5 lbs.

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