Electrostatic headphones require sheer, raw power to drive their performance.
The Pro iESL energises your electrostatics. And then some.
Product Details
Electrostatic Headphone Transformer-Coupled Energiser
Experience audio like never before.
Team iFi.
Coupled with the Pro iCAN, the Pro iESL lowers distortion, enhances and separates vocals, orchestras and instruments, opens the bass and leaves you with a wide, structured soundstage.
The tech spec.
The Pro iESL includes a:
- Pinstripe Permalloy Core Transformer – To lower distortion,
- Bias Voltage Generator – To charge electrostatics to the max before cutting them off to run on battery, not the mains so no electronic noise bleeds into the headset
The Pro iESL makes it virtually impossible for background noise and distortion to ruin your listening enjoyment.
Drive your electrostatics with one of the best energisers in the business. Compatible with all the great electrostatic headphone brands - including Orpheus and Koss.
The 'Perfectly Matched' headphone experience.
Both classic and cutting edge technology in 3 quality components delivers a perfectly matched listening experience - one-off Pinstripe Permalloy Core Transformer, a Bias Voltage Generator and the Capacitive Battery Power Supply.
Making a transformer with the wide bandwidth and low distortion needed in the iESL is very challenging. To attain this, the custom transformers use complicated hand-wound, multi-section windings with both 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.
'The Capacitive Battery Power Supply.
The battery is 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.
An essentially perfect bias voltage source with no electronic noise whatsoever at any frequency as the headphones are in essence, powered by the battery bank and not the mains!
These 1,000Volt rated capacitors are from Germany. The key is the very high insulation resistance and minimal current leakage, as any such leakage causes self-discharge.
The whole capacitor pack has around 35,000,000 kiloOhm insulation resistance, which means that self-discharge time (to 30%) is around 100,000 seconds or 27 hours. So one is always listening on battery (not mains) power.
Vishay MELF resistors - complex, costly BUT superior. These resistors provide optimal power rating and pulse load capability. Nothing else comes close.
Good news for your dynamics.
The unique transformer properties gives the iESL an ear tingling transformer coupled-stage that is unsurpassed. So each and every flagship dynamic headphone when used through the iESL enjoys a whole new level of smoothness and airiness.
Specifications
| Maximum Output voltage: | 640V RMS (16?/20V in) 320V RMS (64?/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) |
