AUDAC ALI20MK2 User manual

ALI20MK2
User Manual
www.audac.eu

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Index
Introduction 4
Precautions 5
Safety requirements 5
Caution servicing 6
EC Declaration of Conformity 6
Waste of Electrical and Electronic Equipment (WEEE) 6
Chapter 1: Connections and connectors 7
Connection standards 7
Chapter 2: Overview ALI20MK2 8
Front panel ALI20MK2 8
Rear panel ALI20MK2 9
Chapter 4: Using the ALI20MK2 10
Chapter 5: Additional information 11
Technical specifications 11
Notes 12

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The ALI20MK2 is an audio line isolator designed to isolate audio devices from each
other. This way hum and buzz noises caused by ground loops or RF in audio systems
can be easily eliminated.
The ALI20MK2 offers a completely passive solution to isolate audio devices from each
other. It is especially usefull for PA systems where source, amplifiers and speakers are
located distant from each other, a slight humm may cause hours of troubleshooting and
can be easily avoided by connecting the ALI20MK2 at the input of your amplifier, quickly
eliminating ground loop humm and buzz.
We fitted two male and two female balanced XLR connectors on the ALI20MK2, both
pairs are connected to a separate symetrically designed audio isolation circuit, allowing
signal passing in both directions. This circuit with an impedance of 600 Ohm and a turn
ratio of 1 : 1, eliminates ground loops and minimizes RF noise without distorting, or
phase shifting the audio signal.
Introduction
Audio line isolator

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Precautions
READ FOLLOWING INSTRUCTIONS FOR YOUR OWN SAFETY
ALWAYS KEEP THESE INSTRUCTIONS. NEVER THROW THEM AWAY
ALWAYS HANDLE THIS UNIT WITH CARE
HEED ALL WARNINGS
FOLLOW ALL INSTRUCTIONS
NEVER EXPOSE THIS EQUIPMENT TO RAIN, MOISTURE, ANY DRIPPING OR SPLASHING
LIQUID. AND NEVER PLACE AN OBJECT FILLED WITH LIQUID ON TOP OF THIS DEVICE
NO NAKED FLAME SOURCES, SUCH AS LIGHTED CANDLES, SHOULD BE PLACED
ON THE APPARATUS
DO NOT PLACE THIS UNIT IN ENVIRONMENTS WHICH CONTAIN HIGH LEVELS OF
DUST, HEAT, MOISTURE OR VIBRATION
THIS UNIT IS DEVELOPED FOR INDOOR USE ONLY. DO NOT USE IT OUTDOORS
ONLY USE ATTACHMENTS & ACCESSORIES SPECIFIED BY THE MANUFACTURER
USE THE APPARATUS ONLY IN MODERATE CLIMATES

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CAUTION - SERVICING
This product contains no user serviceable parts. Refer all servicing
to qualified service personnel. Do not perform any servicing
(unless you are qualified to)
EC DECLARATION OF CONFORMITY
This product conforms to all the essential requirements and further
relevant specifications described in following directives: 2014/30/
EU (EMC) and 2014/35/EU (LVD)
WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT (WEEE)
The WEEE marking indicates that this product should not be
disposed with regular household waste at the end of its life cycle.
This regulation is created to prevent any possible harm to the
environment or human health.
This product is developed and manufactured with high quality
materials and components which can be recycled and/or reused.
Please dispose this product at your local collection point or
recycling centre for electrical and electronic waste. This will make
sure that it will be recycled on an environmentally friendly manner,
and will help to protect the environment in which we all live.

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Chapter 1
Connections and connectors
CONNECTION STANDARDS
The in- and output connections for AUDAC audio equipment are performed according
to international wiring standards for professional audio equipment.
XLR:
For balanced microphone input connections. Image shows female port
(receptacle).
Pin 1: Ground
Pin 2: Signal +
Pin 3: Signal -

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Chapter 2
Overview ALI20MK2
Front panel ALI20MK2
ALI20MK2 Front panel
Balanced Female XLR connectors:
Located on the front panel are both balanced Female XLR inputs, both are connected
to an individual, isolated audio circuit. The symmetrical design allows you to pass the
audio signal in both directions.
Ground lift switch:
The ground lift switch provides the option to eliminate unwanted humm and buzz by
interrupting the ground, this prevents current form flowing through the cables shielding
resulting in a clean audio signal.

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Rear panel ALI20MK2
ALI20MK2 Rear panel
Balanced Male XLR out connectors:
Similar to the front panel, the back panel is equipped with two balanced Male XLR
outputs, both accompanied by a ground lift switch. The symmetrical design allows you
to pass the audio signal in both directions.
Ground lift switch:
The ground lift switch provides the option to eliminatewanted humm and buzz by
interrupting the ground, this prevents current form flowing through the cables shielding
resulting in a clean audio signal.

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Chapter 4
Using the ALI20MK2
The ALI20MK2 can be used in both PA systems as well as Recording & Broadcasting
studios.
To easily eleminate noise in a PA system, simply connect the ALI20MK2 at the input of
your amplifier. This will save you hours of troubleshooting especially in systems where
source, speakers and amplifiers are located far-off each other.
Noise free signal transfer is an essential part of every Broadcasting and Recording studio.
Achieving the most accurate can be done with the ALI20MK2 by eliminating ground loops
and minimizing RF noise without distorting or phase shifting the signal.

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Technical specifications
Turn ratio 1 : 1
Bandwith 0.8 Hz - 100 kHz
Typical distortion (@ 1 kHz) 0.001%
THD+N (@ 1 kHz) 0.035% (@ 20 Hz and -20dBu (typical))
< 0.001% (@ 1 kHz and -20dBu (typical))
Inputs Impedance 600 Ω
Connector 2 x XLR female
Outputs Impedance 600 Ω
Connector 2 x XLR male
Frequency High -3 dB Cutoff 105 kHz
Low -3 dB Cutoff 0.8 Hz
Response 20 Hz -0.09 dB (reference 1 kHz)
20 kHz -0.10 dB (reference 1 kHz)
Max. Inputs Level (@ 1% THD+N) 20 Hz +2 dBu (0.975V)
50 Hz +10 dBu (2.449V)
Dimensions (W x H x D) 108 x 44 x 165 mm
Weight 0.45 Kg
Packaging Carton box
Shipping weight & Volume 0.77 Kg - 0.0078 Cbm
Optional accessories MBS1xx Mounting brackets

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Notes