Intellijel Quadratt 1U User manual

Stereo Mixer 1U
Chainable Mono/Stereo Audio Utility Mixer
Manual (English)
Revision: 2021.01.09

TABLE OF CONTENTS 
TABLE OF CONTENTS 1
COMPLIANCE 2
INSTALLATION 3
Before Your Start 3
Installing Your Module 4
OVERVIEW 6
FRONT PANEL 7
BACK PANEL 8
Connecting Stereo Mix 1U to the Audio Jacks on your 7U Case 9
Output Connection 9
Combining Modules 10
Connecting Stereo Mix 1U to the Audio Jacks on your Palette Case 11
Connecting Stereo Mix 1U to an Intellijel Outs Module 12
Connecting Stereo Mix 1U to a v2 Headphones 1U Module 13
TECHNICAL SPECIFICATIONS 14
 
Stereo Mixer 1U Manual 1

COMPLIANCE 
Stereo Mixer 1U Manual 2
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
Changes or modifications not expressly approved by Intellijel Designs, Inc. could
void the user’s authority to operate the equipment.
Any digital equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio
communications.
This device meets the requirements of the following standards and directives:
EMC: 2014/30/EU
EN55032:2015 ; EN55103-2:2009 (EN55024) ; EN61000-3-2 ; EN61000-3-3
Low Voltage: 2014/35/EU
EN 60065:2002+A1:2006+A11:2008+A2:2010+A12:2011
RoHS2: 2011/65/EU
WEEE: 2012/19/EU

INSTALLATION 
This module is designed for use within
an Intellijel-standard 1U row, such as
contained within the Intellijel 4U, 7U and
Palette Eurorack cases. Intellijel’s 1U
specification is derived from the
Eurorack mechanical specification set
by Doepfer that is designed to support
the use of lipped rails within industry
standard rack heights.
Because this is a passive module, it
requires no power to operate.
Before Your Start 
Intellijel Eurorack modules are designed to be used with a Eurorack-compatible case and power
supply. We recommend you use Intellijel cases and power supplies.
Before installing a new module in your case, you must ensure your power supply has a free power
header and sufficient available capacity to power the module:
● Sum up the specified +12V current draw for all modules, including the new one. Do the same for
the -12 V and +5V current draw. The current draw will be specified in the manufacturer's
technical specifications for each module.
● Compare each of the sums to specifications for your case’s power supply.
● Only proceed with installation if none of the values exceeds the power supply’s specifications.
Otherwise you must remove modules to free up capacity or upgrade your power supply.
You will also need to ensure your case has enough free space (hp) to fit the new module. To
prevent screws or other debris from falling into the case and shorting any electrical contacts, do not
leave gaps between adjacent modules, and cover all unused areas with blank panels. Similarly, do
not use open frames or any other enclosure that exposes the backside of any module or the power
distribution board.
Stereo Mixer 1U Manual 3

You can use a tool like ModularGrid to assist in your planning. Failure to adequately power your
modules may result in damage to your modules or power supply. If you are unsure, please contact
us before proceeding.
Installing Your Module
When installing or removing a module from your case
always turn off the power to the case and disconnect the
power cable. Failure to do so may result in serious injury
or equipment damage.
Ensure the 10-pin connector on the power cable is
connected correctly to the module before proceeding.
The red stripe on the cable must line up with the -12V
pins on the module’s power connector. The pins are
indicated with the label -12V, a white stripe next to the
connector, the words “red stripe”, or some combination of
those indicators. On Intellijel power supplies the pins are
labelled with the label “-12V” and a thick white stripe.
Sometimes the connectors are shrouded, ensuring the cable can only be oriented in one direction.
Most modules will come with the cable already connected but it is good to double check the
orientation. Be aware that some modules may have headers that serve other purposes so ensure
the cable is connected to the right one.
The other end of the cable, with a 16-pin connector,
connects to the power bus board of your Eurorack
case. Ensure the red stripe on the cable lines up with
the -12V pins on the bus board. On Intellijel power
supplies the pins are labelled with the label “-12V” and
a thick white stripe. Sometimes the connectors are
shrouded, ensuring the cable can only be oriented in
one direction.
If you are using another manufacturer’s power supply,
check their documentation for instructions.
Stereo Mixer 1U Manual 4

Once connected, the cabling between the module and power supply should resemble the picture
below:
Before reconnecting power and
turning on your modular system,
double check that the ribbon cable
is fully seated on both ends and
that all the pins are correctly
aligned. If the pins are misaligned
in any direction or the ribbon is
backwards you can cause damage
to your module, power supply, or
other modules.
After you have confirmed all the
connections, you can reconnect
the power cable and turn on your
modular system. You should
immediately check that all your modules have powered on and are functioning correctly. If you
notice any anomalies, turn your system off right away and check your cabling again for mistakes.
 
Stereo Mixer 1U Manual 5

OVERVIEW 
Stereo Mixer 1U is a versatile, expandable audio mixer for the Intellijel 1U format. It has two pairs of
front panel inputs, each with its own level control, and a mixed output pair. For each input pair, the
left channel is normalled to the right channel, for mono operation.
Using 3-pin Link connectors on the back panel, you can chain multiple Stereo Mixer 1U’s together in
series, giving you the ability to mix together even more inputs, or to create sub-mixes for routing
audio around larger systems. You can also these same connectors to patch Intellijel’s Mixup and
XY IO 1U modules to these back-panel chains, and you can connect them directly to the ¼” audio
jacks on an Intellijel Palette Case, a 7U case with 2nd-generation Audio Jacks Board, an Outs
module, or a v2 Headphones 1U.
Because Stereo Mixer 1U is designed specifically for audio (and not for CV mixing), it’s AC-coupled,
and uses audio-grade, logarithmic attenuators for a smooth, even response across the entire
volume range.
Stereo Mixer 1U Manual 6

FRONT PANEL 
[1] LEVEL 1 : This knob reduces the level of the
signal patched into IN 1L [A] and IN 1R [B] ,
prior to sending it out the MIX L [E] & MIX R [F]
jacks. Use it along with the LEVEL 2 [2] knob to
establish the desired output mix.
[2] LEVEL 2 : This knob reduces the level of the
signal patched into IN 2L [C] and IN 2R [D] ,
prior to sending it out the MIX L [E] & MIX R [F]
jacks. Use it along with the LEVEL 1 [1] knob to establish the desired output mix.
[3] OUTPUT LEVEL LED : This LED lights when the sum of all the inputs (front panel jacks plus
the back panel 3-pin Link connector) causes either side of the mixed stereo output to clip.
Obviously, the more inputs you feed into the Stereo Mixer 1U (or the more Stereo Mixer 1U’s
and/or Mixups you feed into each other), the greater the potential to overdrive the Mix bus. So if
the CLIP LED lights, consider reducing the various LEVEL knobs to maintain a clean, unclipped
output.
[A] IN 1L : This is the left side of stereo audio input 1. Audio is routed from IN 1L to the MIX L [E]
output, at the level determined by the LEVEL 1 [1] knob. If nothing is plugged into IN 1R [B] ,
then IN 1L is used as a mono input, and the signal is routed to both the MIX L [E] and MIX R [F]
outputs.
[B] IN 1R : This is the right side of stereo audio input 1. Audio is routed from IN 1R to the MIX R [F]
output, at the level determined by the LEVEL 1 [1] knob. If you leave IN 1R unpatched, then
any signal arriving at IN 1L [A] is normalled to IN 1R .
[C] IN 2L : This is the left side of stereo audio input 2. Audio is routed from IN 2L to the MIX L [E]
output, at the level determined by the LEVEL 2 [2] knob. If nothing is plugged into IN 2R [D] ,
then IN 2L is used as a mono input, and the signal is routed to both the MIX L [E] and MIX R [F]
outputs.
[D] IN 2R : This is the right side of stereo audio input 2. Audio is routed from IN 2R to the MIX R [F]
output, at the level determined by the LEVEL 2 [2] knob. If you leave IN 2R unpatched, then
any signal arriving at IN 2L [C] is normalled to IN 2R .
[E] MIX L : This is the mixed output of all the signals on the left bus (i.e., the attenuated levels of
IN 1L [A] and IN 2L [C] , plus any audio arriving via the 3-pin Link connector on the back panel).
[F] MIX R : This is the mixed output of all the signals on the right bus (i.e., the attenuated levels of
IN 1R [B] and IN 2R [D] ), plus any audio arriving via the 3-pin Link connector on the back
panel).
Stereo Mixer 1U Manual 7

BACK PANEL 
Each Stereo Mixer 1U module features a pair of rear panel 3-pin Link connectors, which enable you
to serially connect multiple Stereo Mixer 1U (and/or the Intellijel Mixup or XY IO 1U) modules to
create a larger mixer with more inputs, or to connect the Stereo Mixer 1U directly to the ¼” jacks on
a compatible Intellijel case, and other compatible Intellijel modules.
[1] CHAIN-OUT - This connector taps into the Left and Right OUT bus. Use the supplied link cable
to connect the CHAIN-OUT of one Stereo Mixer 1U to the CHAIN-IN connector on another
compatible module (such as another Stereo Mixer 1U; a Mixup; an Outs module; or a
v2 Headphones 1U). Alternatively, use it to connect the module directly to the ¼” audio jacks on
a compatible Intellijel case (such as one of the Palette series cases, or the 7U case). When
used in this way, the case’s ¼” jacks become unbalanced Stereo Mixer module outputs.
[2] CHAIN-IN - This connector adds another pair of inputs directly to the Left and Right bus. Use
the supplied link cable to connect the CHAIN-IN of one Stereo Mixer 1U to the CHAIN-OUT
connector on another compatible module (such as another Stereo Mixer 1U or a Mixup).
Alternatively, you may use this to connect the module directly to the ¼” audio jacks on a
compatible Intellijel case (such as the Palette series, or the 7u case). When used in this way,
the case’s ¼” jacks become unbalanced inputs to the Stereo Mixer module.
IMPORTANT : Never use the 3-wire Link cable to directly connect a Stereo Mixer 1U module to an
Intellijel Pedal I/O module. Although both modules use this same cable/connector — they serve
different purposes and carry different signals.
The following sections illustrate a few of the many possible device connections offered by the back
panel’s pair of 3-pin Link connectors.
Stereo Mixer 1U Manual 8

Connecting StereoMix1U to the Audio Jacks on your 7U Case 
If you have a 2nd generation Audio Jacks board installed in your Intellijel 7U Performance Case,
you can connect one or two Stereo Mixer 1U’s directly to these jacks. This connection method does
not work with a 1st generation Audio Jacks board, though you can purchase and easily install a 2nd
generation board in your case.
You can distinguish 1st generation boards (included with cases built before early 2019) by the
single connector along the bottom of the Audio Jacks board. 2nd generation boards have a large
shrouded header flanked by two smaller shrouded headers, flanked by two link connectors.
Output Connection 
1. Connect one end of the supplied 3-wire link cable to the
CHAIN-OUT on your Stereo Mixer 1U.
2. Connect the other end to either of the two 3-pin connectors
on the Audio Jacks board. The left connector uses the two
left jacks for L/R Stereo outputs, while the right connector
uses the two right jacks.
In this scenario, the audio jacks work as unbalanced
outputs.
Stereo Mixer 1U Manual 9

Combining Modules 
You can connect up to two Stereo Mixer 1U modules to the Audio Jacks Board, or you can even
combine a Stereo Mixer with another 2-channel module (such as a Mixup or a Pedal I/O 1U ).
Similarly, you can connect a Stereo Mixer’s CHAIN-IN connector to either of the two 3-pin Link
connectors on the Audio Jacks board and feed external audio from the corresponding jacks into the
Stereo Mixer 1U bus. The following illustration shows one Stereo Mixer being used as an output
mixer, and the other as an input mixer.
Stereo Mixer 1U Manual 10

Connecting Stereo Mix 1U to the Audio Jacks on your Palette Case 
If you have an Intellijel Palette case, you can connect the Stereo Mixer 1U directly to a pair of ¼”
audio jacks on the top of the Palette (there is one pair of ¼” audio jacks on the Palette 62, and two
pairs on the Palette 104). You can choose whether you want the ¼” jacks to send audio out of the
Stereo Mixer 1U, or into it.
● To send unbalanced, line-level mixed audio directly out of the Stereo Mixer 1U to a pair of
¼” audio jacks on the Palette, connect the 3-wire Link cable (provided with your Stereo Mixer
module) between the Stereo Mixer’s CHAIN-OUT connector and a 3-pin Link connector on your
Palette. There is only a single pair of ¼” jacks on the Palette 62, so there is only one 3-pin Link
connector. The Palette 104 has two pairs of ¼” jacks, so there are two 3-pin Link connectors —
you can connect the Stereo Mixer 1U to either of the Palette 104’s two 3-pin Link connectors,
depending on which pair of ¼” jacks you wish to use.
● To send unbalanced, live-level audio directly into the Stereo Mixer 1U from a pair of ¼” audio
jacks on the Palette, connect the 3-wire link cable (provided with your Stereo Mixer module)
between the Stereo Mixer’s CHAIN-IN connector and a 3-pin Link connector on your Palette.
There is only a single pair of ¼” jacks on the Palette 62, so there is only one 3-pin Link
connector. The Palette 104 has two pairs of ¼” jacks, so there are two 3-pin Link connectors —
you can connect the Stereo Mixer 1U to either of the Palette 104’s two 3-pin Link connectors,
depending on which pair of ¼” jacks you wish to use.
 
Stereo Mixer 1U Manual 11

Connecting Stereo Mix 1U to an Intellijel Outs Module
If you own an Intellijel Outs module, you can connect it directly to the Stereo Mixer 1U using the
included link cable. To do so:
1. Using the 3-wire link cable provided with your Stereo Mixer 1U module, connect one end of it to
the CHAIN-OUT 3-pin connector on the Stereo Mix, and the other end to the 3-pin connector on
the Outs module.
2. IMPORTANT! On the back of the Outs module, remove the JP1 jumper connector and put it
in a safe place .
This jumper is what normals the Outs module’s Left input to its Right input. Since the
Stereo Mixer 1U module has its own Left-to-Right normaling, 3-pin Link connections require
removal of this jumper to achieve expected operation and optimum sonic fidelity.
Stereo Mixer 1U’s MIX L and MIX R signals are now sent directly to the left and right inputs on
your Outs module without patching the front panels.
 
Stereo Mixer 1U Manual 12

Connecting Stereo Mix 1U to a v2 Headphones 1U Module
If you own an Intellijel Headphones 1U module (version 2 only), you can connect it directly to the
Stereo Mixer 1U using the included link cable. To do so:
1. Confirm you have a “version 2” Headphones 1U module.
Version 2 modules, in production since August 2019, have a 3-pin Link connector and a jumper
on the rear panel. Version 1 modules do not.
2. Using the included 3-wire link cable, connect one end of it to the CHAIN-OUT 3-pin connector
on the Stereo Mixer 1U, and the other end to the 3-pin input connector on the Headphones 1U
module.
3. IMPORTANT! On the back of the Headphones 1U module, remove the JP1 jumper connector
and put it in a safe place .
This jumper is what normals the
Headphones 1U module’s Left input to
its Right input. Since the Stereo Mixer
module has its own Left-to-Right
normaling, 3-pin Link connections
require removal of this jumper to achieve
expected operation and optimum sonic
fidelity.
4. Stereo Mixer’s MIX L and MIX R signals
are now duplicated directly to the left
and right inputs on your Headphones 1U
module without patching the front
panels.
Stereo Mixer 1U Manual 13

TECHNICAL SPECIFICATIONS 
Stereo Mixer 1U Manual 14
Width
16 hp
Maximum Depth
25 mm
Current Draw
17mA @ +12V
6mA @ -12V