Ifi Pro iESLnewiFi Audio Pro iESL Electrostatic headphone energizeriFi Audio Pro iESL Electrostatic headphone energizer (New) Product highlights:high-voltage energizer for powering electrostatic headphonescompact all-metal chassis with rubberized no-slip base to...1399.00

iFi Audio Pro iESL Electrostatic headphone energizer

Listing ID: lisa50ie Classified 
 Listed  · 110 Views
Time Left:22 Days
New Retail Price: $1,499.00


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Ships fromLos Angeles, CA, 90015
Ships toUnited States
Package dimensionsunspecified
Shipping carrierFedEx
Shipping cost$19.99
Agon miniAverageResearch Pricing

iFi Audio Pro iESL Electrostatic headphone energizer (New)

Product highlights:

  • high-voltage energizer for powering electrostatic headphones

  • compact all-metal chassis with rubberized no-slip base to minimize resonance

  • adjustable voltage settings for properly powering legendary and popular electrostats

  • requires power from a separate amplifier. We recommend the iFi PRO iCAN headphone amplifier

Audio performance features:

  • custom, hand-wound transformers generate wide bandwidth with low distortion

  • built-in batteries and capacitors for banking power to drive headphones
    • helps to isolate signals from AC power supply to avoid dirty power and line noise

  • premium capacitors for stable, efficient power supply with no spikes or sudden drops

  • outboard "iPower Plus" power supply for clean, substantial power
    • separated and shielded from audio circuitry to avoid interference

Back-panel inputs/outputs:

  • proprietary "ESL-Link" connector for use with iFi Pro iCAN headphone amp (cable included)

  • one balanced XLR 4-pin input

  • dual speaker binding-post inputs for connecting an external amplifier
    • for safe operation, amp rating should not exceed 100 watts/8 ohms

  • dual speaker outputs for connecting speakers

  • DC power input

Front-panel headphones outputs:

  • 5-pin "pro bias" socket for connecting modern electrostatic headphones (MrSpeakers VOCE, newer Stax models, etc.)
    • 500V to 640V adjustable bias voltage

  • 6-pin "normal bias" socket for connecting classic electrostatic headphones (vintage Stax models, etc.)
    • 230V bias voltage

  • one balanced XLR 4-pin output for dynamic headphones

Front panel controls:

  • input selector dial

  • AC termination adjustment dial
    • helps maintain three-dimensional soundfield with different types of connected gear

  • impedance adjustment dial (for incoming load from driving amplifier)
    • 16 ohms to 96 ohms

  • bias voltage setting control dial

  • recommended bias voltage usage for popular electrostatic headphones:

    • 230V — vintage Stax models

    • 500V — Sennheiser Orpheus HE-90 (original)

    • 540V — MrSpeakers VOCE, Sennheiser HE-60 (latest version), King Sound KS-H4

    • 580V — Stax Pro Bias ESHP

    • 600V — Koss ESP/950, HiFiMAN Jade

    • 620V — no current headphones, but ready for future options

Other info & specs:

  • frequency response: 5-500,000 Hz (-3 dB)

  • maximum output voltage:

    • 640V RMS (16 ohms in)

    • 320V RMS (64 ohms in)

  • power consumption: <1W

  • 8-1/8"W x 2-1/2"H x 8-1/2"D

  • weight: 5.5 lbs.

  • warranty: 1 year

What's in the box:

iFi Audio Pro iESL owner's manual

  • Electrostatic headphone energizer

  • AC adapter with 5' DC output cord (DC output: 9V 2A)

  • 9" ESL-Link cable (male HDMI plugs on each end)

  • User Manual

  • Warranty card

  • 3 Easy Steps card

  • Audio Band Noise Floor card

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Return Policy
Return Window

Item can be returned within 30 days of receipt.

General Terms

Items must be returned in their original condition, with all included packing materials and no signs of use. Buyer assumes responsibility for all shipping return costs unless the item was not received as described.


Buyer will receive a full refund in the original payment method less any shipping charges.


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