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Summary of Contents for ifi pro iesl
- Page 1 Pro iESL User Manual...
- Page 2 'energiser' for electrostatic headphones. It can also be used to match dynamic headphones to powerful loudspeaker ampliöers. While designed to match the iFi Pro iCAN, the Pro iESL can be used equally well with sufficiently powerful headphone ampliöers and also loudspeaker ampliöers via dedicated separate inputs.
- Page 3 iESL Input Impedance Electrostatic iCAN Balanced 64Ω 24Ω Dynamic Speaker Normal Custom/Pro 96Ω 16Ω Normal 580V 600V Normal 540V 620V 500V 640V AC Termination Bias Pro and Custom Bias Electrostatic Headphone Socket Input Selector Custom Bias Adjustment (500V – 640V) P.5-6 AC Termination Adjustment Impedance Adjustment (16 - 96Ω)
- Page 4 Balanced Input DC 5-9V/0.5A Loudspeakers ESL link ifi-audio.com Technology licensed from AMR-Audio, UK Assembled in China DC Power Supply Connection Loudspeaker Inputs ESL-Link Loudspeaker Outputs Balanced Signal Input...
- Page 5 1. LED Orange: power on (either via DC power supply or ESL-Link) There are 2-ways to power the iESL, see ESL-Link and DC power supply sections. Tip: 2. Input Selector Off iESL is off. Pro iCAN Pro iCAN via ESL Link. On this setting, the iESL will turn on/off...
- Page 6 4. Normal Bias Electrostatic headphone socket 6-pin socket for older Stax Headphones, 230V Bias Voltage 5. Balanced Dynamic headphone socket 4-pin XLR socket for dynamic headphones, including AKG K-1000 and any compatible wired headphone, including Audeze. 6. Pro/Custom Bias Electrostatic headphone socket 5-pin socket for modern Stax headphones, 500V to 640V adjustable Bias Voltage 7.
- Page 7 640V (Custom) Future option 8. Impedance Adjustment The impedance response can be adjusted from 16 to 96Ω. This impedance describes the load Ω impedance for the driving amp with a "standard" electrostatic headphone connected. Lower impedance settings create a greater step-up and will produce a louder sound level at the same headphone ampliöer volume setting.
- Page 8 5V - 9V/1A DC Power input. Use the supplied iFi iPower for standalone operation without the Pro iCAN. No extra power supply is needed if the Pro iESL is connected to the Pro iCAN via the ESL-Link cable directly. 13. Connector for iFi Pro iCAN Link Module...
- Page 9 DO NOT CONNECT ANY OTHER EQUIPMENT! This is only reserved for the iFi Pro iCAN headphone ampliöer using the supplied cable! Speciöcations: Maximum Output voltage: 640V RMS (16Ω/20V in) Ÿ 320V RMS (64Ω/20V in) Ÿ Frequency Response: 5Hz – 50kHz (-3dB) Ÿ...
- Page 10 Exceeding the rated bias for a given headphone may damage it, so it is not recommended and exceeding the rated bias is done at your own risk. Warning: AMR/iFi is not responsible for any damage arising from using the Pro iESL and or Pro iCAN with incorrect settings. Notes on Use with Pro iCAN Most electrostatic headphones are very inefficient.
- Page 11 Depending on the impedance control setting the Pro iCAN and Pro iESL combo can deliver between 320V RMS (910V PP) to 640V RMS (1820V PP). These are very high voltage levels and may exceed the rated limit of the electrostatic headphones. Please conörm with your electrostatic headphone manufacturer what levels are allowed and, if in any doubt, only use the high impedance settings.
- Page 12 The Transformers In order to produce the high voltages requires by electrostatic headphones, the Pro iESL employs custom-made transformers of the highest quality. The extremely critical core of the transformers is a hybrid that combines ultra-thin GOSS with “pinstripe”...
- Page 13 Bias Voltage from dropping. At iFi we decided to completely toss out all existing solutions. First, we decided to use a battery of multiple parallel ölm capacitors to provide the bias voltage. Film Capacitors hold their charge almost indeönitely.
- Page 14 completely separate and independent bias circuits are employed, one for the 230V “normal” bias and another adjustable, to cover a wide range of modern electrostatic headphones. The Signal Routing The entire signal switching for the input selection utilises gold-plated silver contact miniature relays ölled with an inert gas.
- Page 15 139-141 Cambridge Road, Churchtown, Southport, PR9 7LN, United Kingdom www.iö-audio.com Ver1.1...