IFI AUDIO PRO IESL HEADPHONE AMP FOR ELECTROSTATIC HEADPHONE À PARIS

iFi Audio Pro iESL Headphone Amp for Electrostatic Headphones.  The Pro Series iESL electrostatic headphone amplifier from iFi AUDIO offers transparency and an ultra-wide frequency range. It works with all Stax, Sennheiser Orpheus, and electrostatic headphones. 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. 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.  Bought in 09/2019 - Mint Condition -  Sold with full set of accessories and original box.  Still under Manufacturer Warranty (IFI Audio)