ifi Pro iESL Manuale utente
Pro iESL
User Manual
1
Thank you for purchasing this Pro series iESL. The is an audiophile-grade 'energiser' forPro iESL
electrostatic headphones. It can also be used to match dynamic headphones to powerful loudspeaker
ampli!ers.
While designed to match the iFi Pro iCAN, the can be used equally well with sufficiently
Pro iESL
powerful headphone ampli!ers and also loudspeaker ampli!ers via dedicated separate inputs.
Note: The is not a headphone ampli!er. It is a matching device that allows electrostatic headphones toPro iESL
be used with normal headphone/loudspeaker ampli!ers. It requires an external power ampli!er to drive the
headphones.
Key features:
1. Upgrades iCAN Pro to drive electrostatic headphones using the ESL-Link
2. Upgrades all standard headphone ampli!ers to drive electrostatic headphones#
3. Upgrades all loudspeaker ampli!ers to drive electrostatic/dynamic/planner headphones
4. Capacitive Battery Power Supply eliminates all AC and switching noise
5. Adjustable AC termination: Pro/Normal/Off
6. Custom Bias adjustment: 500 - 640V
7. Loading impedance adjustment: 16Ω- 96Ω
#Sufficient power / voltage output from the HP Ampli!er is required (>10V/16R)
6.
1.
Pro and Custom Bias Electrostatic
Headphone Socket
Custom Bias Adjustment (500V – 640V)
Impedance Adjustment (16 - 96Ω)Ω
LED
Input Selector
AC Termination Adjustment
Normal Bias Electrostatic Headphone Socket
Dynamic Headphone Socket
2
P.5-6
Nor mal Pro
OFF
580 V 600V
620 V540 V
Normal Custom/Pro
Pr o
Input
iCAN Balanced
Speaker
OFF
640 V500 V
96Ω16Ω
Impedance
AC Term ination Bias
Pro
+
Nor mal
Electrostatic
Dynamic
iE SL
64Ω24Ω
1 2 345 6 78
2.
3.
4.
5.
P.4
7.
8.
P.4
P.4
P.5
P.5
P.5
P.6
Balanced Input
DC 5-9V/0.5A
ifi-a udio. com
Pr o
Techn ology l icens ed from A MR-Au dio, UK Ass emble d in Chin a
ESL link-
Loudspeakers Out
RLIn
RL
3
DC Power Supply Connection
ESL-Link
Loudspeaker Inputs
Loudspeaker Outputs
Balanced Signal Input
9 1310 11 12
9.
10.
11.
12.
13.
P.6
P.7
P.7
P.7
P.7
4
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
Pro iCAN
Balanced
Loudspeaker
3. AC Termination Adjustment
Off
NormalAC
Pro
Normal/Pro
Tip: AC termination affects the operation of the headphone, by either making the bias node that is shared
between both channels high impedance, and low impedance for audio signals. This affects a complex set of
parameters, but audibly mainly affects the presentation of the 3D soundscape.
AC Termination is off
Termination Normal Bias Socket only
AC Termination Pro Bias Socket only
AC Termination Normal & Pro Socket
iESL is off.
Pro iCAN via ESL Link.
On this setting, the iESL will turn on/off with the iCAN Pro.
Headphone Ampli!er via rear XLR input loudspeaker
Ampli!er via rear loudspeaker inputs
On this setting, the Loudspeaker Output will turn off.
5
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. Bias Voltage setting
Note: Before turning on the iESL, set the bias voltage according to the above table, or according
to the recommendation given by the electrostatic headphone manufacturer.
Bias voltage usage:
Older Stax ESHP230V (Normal)
Sennheiser Orpheus HE-90500V (Custom)
Sennheiser HE-60, King Sound KS-H2/3/4540V (Custom)
Stax Pro Bias ESHP580V (Pro)
Koss ESP/950, Jade600V (Custom)
Future option620V (Custom)
6
Future option640V (Custom)
8. Impedance Adjustment
The impedance response can be adjusted from 16 to 96Ω. This impedance describes the loadΩ
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 ampli!er volume setting.
Lower impedance settings are a much more difficult load for the driving ampli!er.
Please adjust to suit listening preferences, however, in most cases the higher impedance setting is
recommended.
9. Loudspeaker Inputs
Connect loudspeaker cables from your loudspeaker ampli!er.
The ampli!er rating should not exceed 100W/8 rating for safe operation, or care must be taken whenΩ
setting the volume. Ratings below around 10 Watt/8Ωmay not deliver satisfactory playback levels.
7
10. Loudspeaker Outputs
Connect loudspeaker cables to your loudspeakers.
Switching the input selector to loudspeaker turns offthe loudspeakers and connects the iESL
circuitry to the loudspeaker ampli!er.
Tip: While the iESL Input selector is OFF, or any input except loudspeaker is selected, the loudspeaker input is
linked to the loudspeaker output and disconnected from the iESL circuitry.
11. Balanced Headphone Ampli"er Input
Connect this to any 4-Pin XLR equipped headphone ampli!er you wish to use. It is recommended
that ampli!er should be able to deliver at least 10V into 64Ω, as much as 28V/64Ωare permissible.
12. Power Supply Connection
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
Connect the Pro iCAN ESL-Link socket to the Pro iESL ESL-Link socket using the cable supplied.
8
DO NOT CONNECT ANY OTHER EQUIPMENT! This is only reserved for the iFi Pro iCAN headphone
ampli"er using the supplied cable!
Speci"cations:
Maximum Output voltage:
Frequency Response:
Input Voltage (Pro iESL):
Input Voltage (iPower):
Power Consumption:
Dimensions:
Weight:
Warranty period:
Speci!cations are subject to change without notice.
640V RMS (16Ω/20V in)
320V RMS (64Ω/20V in)
5Hz –50kHz (-3dB)
5V –9V/1A max
AC 85 –265V, 50/60Hz
< 1W
213(l) x 206(w) x 63.3(h) mm
2.5kg (5.5 lbs)
12 months
9
Notes on Electrostatic Headphones
Electrostatic headphones require very high voltages for operation. For example, Stax are around 101dB @ 100V,
compared to around 105dB @ 1V for a common inefficient full size headphone. On top of that, they need a 'bias
voltage,' usually 580V for modern Stax.
The Pro iESL offers both the original (normal) 230V Bias for 6-pin plug connected Stax headphones and
adjustable bias from 500V to 640V (including a dedicated 580V setting for Stax Pro bias) for 5-Pin connected Stax
electrostatic headphones. It can also accommodate many other manufacturers electrostatic headphones if adapters
to Stax 5-Pin pro connection are used.
Different bias settings may be tried. Note that it will take a considerable time for the voltage to fall from a
previous higher setting. Therefore, if testing different bias settings, it is best to start with the lowest setting and
slowly work up towards the nominal voltage.
More bias produces a louder mid-range, while the bass remains at the original level. So lower bias may give a
more warm sound, higher more bright.
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. Due to the limited voltage handling and the low sensitivity,
electrostatic headphones generally do not play very loudly, especially compared to traditional dynamic
headphones.
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