Ifi PRO Iesl User Manual
Pro iESL
User Manual
Thank you for purchasing this Pro series iESL. The is an audiophile-grade 'energiser' for Pro iESL
electrostatic headphones. It can also be used to match dynamic headphones to powerful loudspeaker
ampliers.
While designed to match the iFi Pro iCAN, the can be used equally well with sufficiently Pro iESL
powerful headphone ampliers and also loudspeaker ampliers via dedicated separate inputs.
Note: The is not a headphone amplifier. It is a matching device that allows electrostatic headphones to Pro iESL
be used with normal headphone/loudspeaker amplifiers. It requires an external power amplifier to drive the
headphones.
Key features:
1. Upgrades iCAN Pro to drive electrostatic headphones using the ESL-Link
2. Upgrades all standard headphone ampliers to drive electrostatic headphones
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3. Upgrades all loudspeaker ampliers 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
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Sufficient power / voltage output from the HP Amplier is required (>10V/16R)
1
1 2
3
4
5 6
7
8
Inpu t
Balan ced
iCAN
Pro
OFF
Speake r
LED
2.
Input Selector
3.
AC Termination Adjustment
4.
Normal Bias Electrostatic Headphone Socket
5.
Dynamic Headphone Socket
2
Elec trost atic
P.4
P.4
P.4
P.5
Dyna mic
6.1.Pro and Custom Bias Electrostatic
Headphone Socket
Custom Bias Adjustment (500V – 640V)
7.
Impedance Adjustment (16Ω - 96Ω)
8.
Norma l Custo m/Pro
Pro
Normal
Pro
OFF
+
Normal
AC Terminat ion Bias
P.5
580V 600V
Impe dance
64Ω
96Ω 16Ω
620V540V
640V500V
iE SL
24Ω
P.5
P.5-6
P.6
9 1310 11 12
Balan ced Inp ut
L
Louds peake rs
OutRL
Technolog y licen sed from A MR-Au dio, UK A ssemb led in Ch ina
In
R
DC 5-9V /0.5A
ESL-l ink
Pro
ifi-au dio.c om
9.
Loudspeaker Inputs
10.
Loudspeaker Outputs
11.
Balanced Signal Input
P.6
P.7
P.7
DC Power Supply Connection
12.
13.
ESL-Link
P.7
P.7
3
1. LED
Green: 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
iESL is off.
Pro iCAN via ESL Link.
On this setting, the iESL will turn on/off with the iCAN Pro.
Headphone Amplier via rear XLR input loudspeaker
Amplier via rear loudspeaker inputs
On this setting, the Loudspeaker Output will turn off.
3. AC Termination Adjustment
Off
NormalAC
Pro
Normal/Pro
AC Termination is off
Termination Normal Bias Socket only
AC Termination Pro Bias Socket only
AC Termination Normal & Pro Socket
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.
4
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