ACL Audio Interface User manual

Audio Interface
User’s Manual
Eurorack Synthesizer Modules 14HP

TABLE OF CONTENTS
1.INTRODUCTION
2.WARRANTY
3.INSTALLATION
4.FUNCTION OF PANEL COMPONENTS
5.SIGNALFLOW & ROUTING
6.SPECIFICATIONS
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1. INTRODUCTION
Audiophile Circuits League.-The main purpose of the ACL Audio Interface
module is to interface modular synthesizer systems with professional audio
recording and stage equipment.
The combination of studio quality signal path, �lexible routing possibilities and a
headphone ampli�ier, capable of driving both high and low impedance
headphones with low distortion, makes the connection between these different
environments effortless and sonically transparent.
The ACL Audio Interface offers balanced to unbalanced and unbalanced to
balanced stereo lines with level controls. The stereo signal from the auxiliary
input, also with level control, can be optionally routed to and mixed together
either with balanced to unbalanced, or unbalanced to balanced line signals, or
can be muted. The headphone ampli�ier can also get its signal from one or the
other line after the level control and mixing stage, or can be muted. Since the
ampli�ier is AC coupled only at the input, but not at the output, there is an
on-board DC protection circuit included. In case the headphone ampli�ier is
driven into clipping, the protection can also be tripped. The module has a
soft start function* and one overload indicator for every line.
*With the soft start function, the interface switch is turned on after a while after
turning on the Eurorack main unit. This function can prevent output of
unexpected sound that another module will emit at startup, which will cause
damage to the speaker.
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2. WARRANTY
In the event of a fault in use, we will repair or replace it free of charge under the
warranty terms stated below. The warranty period is valid for one year from the
day of purchase. If repair is necessary, please attach the warranty card to the
product and ask the dealer you purchased it from or our company.
The Warranty card can not be reissued. The Warranty card is valid only in the
country where you purchased. We can not guarantee the incidental damage
caused by the breakdown or damage that occurred during use of this product. In
addition, we can not guarantee when the fault falls under the following
conditions.
· Failure / damage caused by use of unspeci�ied power supply / accessories.
· Failure / damage caused by incorrect connection or use of power cable.
· Failure / damage caused by improper handling method.
· Failure / damage caused by natural disasters (�ire, �looding etc.) and
pollution.
· When the cause of breakdown or damage lies in equipment other than this
product.
· Failure / damage caused by improper modi�ication, adjustment, parts
replacement.
· Failure / damage when used under particularly severe conditions, when
loaned/rental/hired out to 3rd party.
· When replacing expendable items such as battery.
· When there is no presentation of warranty card.
· When the warranty card has not been fully completed, or when it has been
Is it a malfunction?
Please read the user's manual carefully and checking again. If you think that
there is still a problem, please consult with the dealer you purchased from or
contact us (English) .
[email protected]
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3. INSTALLATION
⚠WARNING
*Always turn the Eurorack unit off and unplug the power cord before pluging
the Eurorack power cable.
*When attaching the Eurorack power cable, please be careful not to touch the
terminal part.
Connect to the Eurorack's system power supply (+ 12V) using the supplied
Eurorack power cable.
Connect the 16-pin connector to the Eurorack power connector. Connect the red
mark on the power cable so that it matches the pin on the (- 12 V) side of the
power connector.
Connect the 10 pin connector to this product side. Projection is provided for the
10-pin connector to prevent connecting the included power cable incorrectly in
the reverse direction. Please connect so that the projection of the power cable
and the indentation of this product side connector match.
Projection
Red line
To Module To Power
Connector
GATE
CV
+5V
+12V
GND
GND
GND
-12V
FIG.1：Eurorack power cable
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4. FUNCTION OF PANEL COMPONENTS
①“OUT LEVEL” knob
Output volume control for ③ “OUT” XLR sockets.
②“IN 1” “IN 2” jacks
3.5mm audio inputs (mono) for AC coupled unbalanced signals. Typically, you
will enter the modular �inal audio outputs into these jacks. These audio signals
are converted to balanced signals and output from ③ “OUT” XLR sockets.
③“OUT” XLR sockets
Unbalanced signals inputs from ② “IN 1” “IN 2” jacks are converted to the
balanced signals and output from these XLR sockets (male). The volume of the
outputs is adjusted by ① “OUT LEVEL” knob.
④“IN LEVEL” knob
Adjusts the volume of the audio signal input from ⑥ “IN” XLR sockets.
⑤“OUT 1” “OUT 2” jacks
Balanced audio signals input from ⑥ “IN” XLR sockets are converted to
unbalanced signals and output from these jacks.For example, you can use these
output audio signals, such as sending them to the �ilter module of the modular
system.
2
3
4
5
6
78 9
10
11
12
13
14
1
FIG.2：Front Panel
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⑥“IN” XLR sockets
DC coupled electronically balanced audio signals are input from these XLR
sockets (female), converted into unbalanced audio signals, and output from ⑤
“OUT 1” “OUT 2” jacks.
⑦“HEADPHONES ROUTE”switch
Select the source to output to the headphones. The monitoring route is as
follows.
To monitor the output audio → “O”
*Audio output signals from ③ "OUT" XLR sockets
*Audio input signal from ⑫ "AUX" jack. (If ⑪ "AUX" switch is set to "O")
To monitor the input audio → “I”
*Audio output signals from ⑥ "IN" XLR sockets.
*Audio input signal from ⑫ "AUX" jack. (If ⑪ "AUX" switch is set to "I")
When you want to mute monitoring → “M”
⑧“HEADPHONES VOLUME”knob
Adjust the volume of the headphone output.
⑨“HEADPHONES” jack
3.5 mm stereo jack for headphone output.
~TIPS about headphone~
DC and clipping protection circuit for the headphone ampli�ier, switches off
headphone output if DC at the output exceeds ±50 mV and/or in case of hard
clipping.
⑩“AUX”knob
Adjusts the volume of external input audio signal from ⑫ “AUX” input jack.
⑪“AUX”switch
Mix external input from ⑫ “AUX” jack to “IN”, “OUT” or “MUTE”.
⑫“AUX” jack
Enter the AC coupled auxiliary stereo signal. Input impedance is 220 kOhm.
⑬“OUT OVL” overload indicator
Lights up when the output audio signal causes clipping. It operates when the
audio level reaches 4.5 Vpp. Use the ① “OUT LEVEL“ knob to adjust the volume.
⑭“IN OVL” overload indicator
Lights up when the input audio signal causes clipping. It operates when the
audio level reaches 4.5 Vpp. Use the ④ “IN LEVEL“ knob to adjust the volume.
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FIG.3: Audio Interface signal�low & routing
5. SIGNALFLOW & ROUTING
INPUT MIX
OVERLOAD
PROTECTION
AUX
OUTPUT MIX
OUT 1
OUT 2
1
2
I
M
O
I
M
O
Input
Stereo Aux Input
Level
Attenuator Route Route Volume
Level
Headphones
OUT
To Modular
From Modular Output
IN 1
IN 2
LED
LED
IN
OUT
1
2
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7. SPECIFICATIONS
Power
Eurorack system power supply
Width
14 HP
Depth
22mm
Power consumption
-12V 120 - 200 mA +12V 110 - 200 mA
(depends on settings)
Accessories
· Eurorack power cable x1
· Mounting screws x4
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ACL-E-AI- 1708 - 1