Arrel Audio ER-100 User manual

ER-100 Eurorack
8 Channel Stereo,
Transformer Balanced Out Summing Mixer
User Manual
Issue 0.1

ARREL Audio
ER-100 User Manual, Issue 0.1 Page 2
SAFETY INSTRUCTIONS
WARNING
Always follow the precautions listed below to avoid any possibility of serious injury or even death from electrical shock, short-
circuiting, damages, fire or other hazards. These precautions include, but are not limited to, the following:
•Do not expose the instrument to liquids and rain. Do not use it near water or in damp or wet conditions, or place
containers on it containing liquids. If any liquid seeps turn off the power and unplug the power cord from the AC outlet.
•Do not put burning items, such as candles, on the unit. A burning item may fall over and cause a fire.
•This instrument contains no user-serviceable parts. Do not open the instrument or attempt to disassemble or modify the
internal circuit.
•Never insert or remove an electric plug with wet hands.
•Check the electric plug periodically and remove any dirt or dust which may have accumulated on it.
•Do not place the power cord near heat sources such as heaters or radiators, and do not excessively bend or otherwise
damage the cord, place heavy objects on it, or place it in a position where anyone could walk on, trip over, or roll
anything over it.
CAUTION
Always follow the precautions listed below to avoid any possibility of serious injury or even death from electrical shock, short-
circuiting, damages, fire or other hazards. These precautions include, but are not limited to, the following:
•Do not connect the instrument to an electrical outlet using a multiple-connector. Doing so can result in lower sound quality, or
possibly cause overheating in the outlet itself.
•When removing the electric plug from the instrument or an outlet, hold the plug itself and not the cord. Pulling by the cord can
damage it.
•Remove the electric plug from the outlet when the instrument is not to be used for extended periods of time, or during
electrical storms.
•Do not place the instrument in an unstable position where it might accidentally fall over.
•Before moving the instrument, remove all connected cables.
•When setting up the product, make sure that the AC outlet you are using is easily accessible. If some trouble or malfunction
occurs, immediately turn off the power switch and disconnect the plug from the outlet. Even when the power switch is turned
off, electricity is still flowing to the product at the minimum level.
•When you are not using the product for a long time, make sure to unplug the power cord from the wall AC outlet.
•Use only the stand/rack specified for the instrument. When attaching the stand or rack, use the provided screws only. Failure
to do so could cause damage to the internal components or result in the instrument falling over.
Information for Users on Collection and Disposal of Old Equipment
This special symbol on the products, packaging, and/or accompanying documents means that used electrical and electronic products
should not be mixed with general household waste.
For proper treatment, recovery and recycling of old products, please take them to applicable collection points, in accordance with your
national legislation and the Directives 2002/96/EC.
By disposing of these products correctly, you will help to save valuable resources and prevent any potential negative effects on human
health and the environment which could otherwise arise from inappropriate waste handling.
For more information about collection and recycling of old products, please contact your local municipality, your waste disposal service
or the point of sale where you purchased the items.
[For business users in the European Union]
If you wish to discard electrical and electronic equipment, please contact your dealer or supplier for further information.
[Information on Disposal in other Countries outside the European Union]
This symbol is only valid in the European Union. If you wish to discard these items, please contact your local authorities or dealer and
ask for the correct method of disposal.

ARREL Audio
ER-100 User Manual, Issue 0.1 Page 3
ARREL Audio Contacts
ARREL Audio
Via A. Mondadori, 7
00128 Rome – Italy
Tel [phone]
Fax: [phone]
Info: [e-mail]
Web: www.arrel-audio.com
Support: http://www.arrel-audio.com/support
ARREL Audio is continuously working to the improvement of its systems and related documentation.
In any case, we reserve the right to change the specifications without notice but in the respect to the current legislation.
Disclaimer:
The information contained in this manual has been carefully checked and we believed is accurate at the time of publication.
In any case, we do not assume any responsibility for inaccuracies, errors or omissions nor any liability for any loss or damage resulting either
directly or indirectly from use of the information contained in this manual.

ARREL Audio
ER-100 User Manual, Issue 0.1 Page 4
TABLE OF CONTENTS
SAFETY INSTRUCTIONS...................................................................................................2
ARRELAudio Contacts........................................................................................................3
TABLE OF CONTENTS.......................................................................................................4
INTRODUCTION .................................................................................................................5
Housing................................................................................................................................5
ER-100 Front Panel Controls and Operations .....................................................................6
INPUT SECTION (CHANNELS 1-8)....................................................................................6
Input gain knob................................................................................................................6
Input pan knob .................................................................................................................6
Solo button.......................................................................................................................6
OUTPUT SECTION.............................................................................................................6
Insert Push Button ...........................................................................................................6
SEND/RETURN Left and Right Connectors.....................................................................6
Left and rigth master volume knobs.................................................................................6
Main L/R Out....................................................................................................................6
MONITOR SECTION...........................................................................................................6
MOnitor section GAIN ......................................................................................................6
Solo LED..........................................................................................................................6
AUX button.......................................................................................................................7
Headphones TRS jack .....................................................................................................7
Monitor Out ....................................................................................................................7
ER-100 FAQ.....................................................................................................................8
APPENDIXA: Front Panel.................................................................................................10
APPENDIX B: BLOCK DIAGRAM..................................................................................11
TECHNICAL SPECIFICATIONS........................................................................................12

ARREL Audio
ER-100 User Manual, Issue 0.1 Page 5
INTRODUCTION
ARREL Audio Eurorack Stereo Transformer Balanced Out Summing Mixer is the
answer to all stream mixing needs for EURORACK synthesizers. Its features set it apart
from other similar products on the market due to a very high fidelity approach used for the
design of the electronics together with the use of high quality line transformers to drive the
L and R outputs. The internal circuits of the ER-100 have been directly derived from the
ARREL Audio professional units in order to obtain maximum sonic performances.
The use of line transformers means a higher voltage output level (about 10 dB over the
competitors), suitable to drive all modern audio converters. Output transformers mean also
a very reliable connection in terms of unbalancing and ground loops problems.
The ER-100 is characterized by 8 input channels and a stereo output. Each channel is
characterized by a pan pot control, a volume control and a solo push button (active on the
monitor bus). A stereo insert (selection switch) is available on the main summing bus. The
monitor section is characterized by volume control and an auxiliary input (control switch)
(push button selection), suitable for monitoring DAC or general external inputs such us a
CD and different signal sources. Two LED VU meters are available on the output bus. The
AUX in can be used to send on line alternative mix.
Housing
The ER-100 is contained in a 28 TE Eurorack units (142 mm) and by a depth of about 40
mm. No specific air conditioning is required for the unit, provided that there is a free flow of
air through the rack from front to back and the temperature is maintained in the operating
range. Consequently, the racks may be stacked.