CH L1 User manual

L1 Dual Monaural Line Preamplier
User Manual

Dear Valued Customer,
We are honored that you chose the L1 Dual Monaural Line Preamplier.
Our team made every effort to design and manufacture this top quality
versatile and future-proof product and is proud to present it to you. We
hope your L1 preamplier will bring you uncountable hours of emotion
from your music collection.
But before you embark on your musical journey, we kindly request your
attention to the information contained in this manual. The L1, as you will
discover in the following pages, is a Swiss precision product designed for
ultimate performance and exibility. However, reaching sonic excellence
requires your unit to be setup and operated correctly and this what
this manual is all about. If you have any questions or require assistance,
please don’t hesitate to contact your authorized dealer.
We hope you will enjoy your L1 preamplier for many years.
The Concert has just begun...
Cossy F.
Heeb T.
L1 User Manual 2

Table of contents
1 Introduction
1.1 Global audio options 4
1.2 Input-specic options 4
1.3 More user congurable options 4
1.4 Chassis congurations/extension 5
1.5 The purpose of this manual 5
2 Setting up your L1
2.1 Safety notice 6
2.2 Changing fuses and operating voltage 6
2.3 Unpacking 7
2.4 Package contents 7
2.5 Placing your L1 and installing the spikes 8
2.6 Stacking the L1 (or not) 9
2.7 Connections 10
2.8.1 USB port 11
2.8.2 Ethernet port 11
2.8.3 Local area network considerations 11
2.8.4 Ground lift jumper 11
2.8.5 Inputs 11
2.8.6 Outputs 11
2.8.7 AC Power 12
3 External power supply connector 12
4 How to congure and operate your L1 13
4.1 Control actions in normal mode 14
4.1.2 To turn the L1 on 14
4.1.3 To select an input 15
4.1.4 To alter volume 15
4.1.5 To engage shortcuts (mute, balance, phase, etc.) 15
4.1.6 To enter menu 15
4.2 Navigating the setup menus 15
4.3 Menu options 16
4.3.1 Audio settings menu 18
4.3.2 Input-specic settings menu 18
4.3.3 Display settings menu 19
4.3.4 Shortcut menu 19
4.3.5 Network menu 19
4.3.6 Factory settings menu 21
4.4 Handheld remote control 22
4.4.1 Batteries 22
5 Firmware update
5.1 Preparing the USB stick 23
5.2 Updating the unit’s rmware 23
5.3 Emergency rmware update procedure 24
6 Troubleshooting 25
7 Specications 26
L1 User Manual 3

1 Introduction
CH products are designed and manufactured in Switzerland by CH Precision Sàrl. We use fully discrete, fully
balanced, fully complementary, ultra-short signal path circuits – but we combine them with sophisticated
software control, monitoring and protection to ensure the highest possible levels of performance, operational
consistency and versatility.
As a result, your L1 offers a number of operational features that are unique and probably unfamiliar. For that
reason it is essential that you fully understand every aspect of the L1’s operation if you are to enjoy its maximum
possible performance.
Please also note that the L1 can be used as a single chassis, a true monaural twin-chassis and with or without
additional X1 power supplies, allowing one, two, three or four-box congurations. The basic instruction
for handling and placing units is identical in all cases. Conguring multi-box systems will be covered in the
appropriate section of this manual.
1.1 Global audio options
Mute
Absolute phase polarity
Mono mode
Balance / channel gain (up to 6dB of gain on either channel in 0.5dB steps)
Maximum starting volume / global volume limit
L1 internal stages calibration
1.2 Input-specic options
Input conguration: active, hidden or bypass
Input coupling: direct coupled or blocking capacitor
Input impedance: high (94kΩ/47kΩ) or low (600Ω/300Ω)
Input gain: ±6dB in 0.5dB steps
Input calibration
Input renaming
1.3 More user congurable options
Display: color, content and brightness
Dene shortcut functions
Network conguration
Firmware version and update
L1 User Manual 4

L1 User Manual 5
1.4 Chassis congurations/extension
As well as being highly congurable in terms of inputs and operation, a single L1 chassis can also be expanded into
a multi-box True Monaural preamplier. This topology offers increased performance but also increased versatility.
Dual monaural: In this conguration, a single L1 is used to hold the two channels (Left and Right, Center and
Sub or Left and Right surround). Two boards are tted inside its chassis, each one independently processing
a single channel. The mains power supply section is common to both the board, however separate dedicated
DC regulation circuits are provided to each board.
True monaural: In this conguration, two L1s are used to hold a single channel each (Left resp. Right, Center
resp. Sub or Left resp. Right surround). One board is tted inside each chassis, each L1 processing a single
audio channel. In this conguration, the entire power supply of the L1 is dedicated to one channel, further
enhancing the system performances.
True monaural extended: The conguration is identical to the True Monaural conguration, with the addition
of a second board in each chassis. The two boards in a chassis work together, as if it was only one board with
twice as many inputs (and outputs). This conguration will be used when more inputs are required than the
amount a single board can provide.
For ultimate results, one/two X1 External Power Supply unit(s) can be connected to the L1(s) in all the above
congurations, adding a second stage of power supply regulation to the preampliers, further improving the
system performances.
1.5 The purpose of this manual
This manual will lead you through each step of the installation and set up procedure, in a clear and logical
sequence. Although the operation and options might seem complex, they will quickly become second nature.
But because of the sheer range of options available it is easy to overlook something unless you approach set up
and conguration in a systematic way. If you take the time to follow the manual, it will ensure that you become
completely familiar with the L1’s many options and that your preamplier delivers the best possible performance.

2 Setting up your L1
2.1 Safety notice
Make sure to observe the following rules:
Always handle with care. The L1 unit is very heavy, so have someone help you when moving it around.
Improper handling of the load could lead to risk of injury.
Install your L1 player on a stable base.
Do not install your L1 unit near water.
Do not expose the unit to any kind of liquid.
Do not install in direct sun light or near any heat source such as radiators or other sources of signicant heat.
Do not install in a conned space and make sure sufcient air can ow around the unit.
Do not operate under high ambient temperatures (>35°C) or with extremely high humidity (>85%) such as in
humid cellars.
Only use options and accessories specied or recommended by the manufacturer.
Do not open the unit nor try to service it by yourself. Do not try to install any option board by yourself.
Always refer to a qualied technician for service, maintenance or upgrades. Failure to do so will void the
unit’s warranty.
In Denmark: Apparatets stikprop skal tilsluttes en stikkontakt med jord som giver forbindelse til stikproppens jord.
In Finland: Laite on liitettävä suojakoskettimilla varustettuun pistorasiaan.
In Norway: Apparatet må tilkoples jordet stikkontakt.
In Sweden: Apparaten skall anslutas till jordat uttag.
2.2 Changing fuses and operating voltage
To change the fuses, switch off the L1 and remove the power cable.
The fuse holder is located to the right of the IEC power input. See diagram on page 10 (Arrow 18)
Fuse values vary with operating voltage:
230VAC – Fuse A : T50mA/250Vac. Fuse B : T1.6A/250Vac
100/115VAC – Fuse A : T100mA/250Vac. Fuse B : T3.15A/250Vac
Never change the selectable voltage during operation.
To change operating voltage, switch off the L1 and remove
the power cable.
Before changing the operating voltage rst check the local voltage.
L1 User Manual 6
BA

L1 User Manual 7
To change the operating voltage, remove
the fuse holder from the L1 chassis.
Fuse B (see picture above) is located in a sleeve
that can be slid out of the body of the fuse
holder: by turning the sleeve and reinserting it,
the orientation of the contact pins is altered,
switching the operating voltage. The selected
voltage will appear in the small window in the
base of the fuse holder.
Make sure that if required, you change the fuse
values to match the new voltage (as above).
You can now reinsert the fuse holder.
2.3 Unpacking
The L1’s carton is large and contains both the component and all of its accessories. You will need an open,
preferably carpeted area in which to unpack it. Please also ensure that the rack or support space on which
the L1 will be placed has been cleared and cleaned before you start. At this point it is also worth ensuring that
the connectors on any interconnect cables are cleaned and that the power to your system is turned off. The
carton consists of an inner box and outer sleeve.
Once you open the inner box, remove the top layer of white foam packaging. Inside you will see the
component chassis and various accessories.
With a helper, carefully lift the L1 out of the box and place it to one side. Then carefully remove the plastic bag
in which it is sealed.
Remove the small, brown Accessory Pack and place it with its unit. Also remove the power cord and suction
cup and the four leveling/grounding spikes (inserted into the lower foam block).
We recommend storing the Accessory Pack in a readily accessible place, so don’t put it back in the cartons
with the plastic bag when resealing it.
2.4 Package contents
Your L1 should arrive in a substantial carton. Once unpacked this carton and packaging materials should be
stored safely in case you ever need to transport your unit. When moving or transporting the L1 unit, this should
always be done in the original packaging.
The carton should contain:
The L1 preamplier
Four two-part a hardened aluminum/polymer spikes
A suction cup (used to remove the four top covers)
An accessory box containing:
–an infrared remote control
– a spike adjustment screwdriver
– a Torx T-10 screwdriver
–four support discs
–four stacking caps
–a USB stick containing the latest CH Precision rmware

L1 User Manual 8
In case of damage to the L1 chassis or missing components, please contact your authorized dealer immediately.
If your L1 unit is still very cold from transport, please let it warm up to room temperature in order to avoid
condensation developing inside it.
2.5 Placing your L1 and installing the spikes
Before positioning your L1, it is worth taking the time to make a few preliminary decisions.
Decide how many (and which) inputs you will use. Familiarizing yourself with (and making a note of) their
position on the rear panel will be extremely useful when you come to actually make connections and allocate
/ congure those inputs.
Decide whether you will use the CH Precision supplied leveling / grounding spikes.
If you do plan to use the CH spikes, use the blue suction cup to remove the four circular covers in the top plate
of each unit. Gently insert the hardened aluminum composite spikes into each exposed shaft and use the
short red screwdriver to turn them enough to engage the threads at the bottom of each spike. Each internal
thread is coated with a thin layer of grease during assembly to prevent galling between it and the aluminum
spike, but adding a thin coating of grease to each thread before insertion is still a good idea, making
adjustment easier and more precise.
Do not screw the spikes in too far at this point or they will protrude from the feet and potentially damage the
supporting surface. Do not replace the top-caps yet.
Check that the voltage selector switch on the unit is set to the correct local voltage and that the power switch
is off (the 0 side depressed).
Now you are ready to place your L1. The chassis is heavy and the feet are tted with rubber rings to protect the
supporting surface, which makes it hard to slide the unit. Having a partner to lift and help place the chassis will
make things considerably easier.
The L1 is supplied with a set of four support discs. These have a groove machined in the upper face that ts
over the rubber ring in the underside of each foot. Lift each corner of the chassis in turn and position the
disc beneath each foot. (Using an AirWedge or similar lifting bladder will make this considerably easier.) The
groove that interfaces with the rubber ring will ensure that the footer disc stays in place if you slide the unit.
As well as making the units easier to position, the support discs can also offer a superior interface between
the grounding spikes and the supporting surface. The spikes are designed to drain internally generated
energy away from sensitive circuitry and into a dispersive support structure, but if the supporting surface
is extremely hard or forms an impedance mismatch with the spike tips, the material and footprint of the
support discs can function as a lossy mechanical buffer, easing the passage of mechanical energy out of the
unit. As a rule, the support discs work well with very hard surfaces, but results will vary with system and
supporting surface. Once set up and warmed up, compare the sound of the unit(s) with and without the discs
in place.
Use the red screwdriver to wind down each four spikes until you feel that they touch the surface underneath.
You will feel a slight resistance due to the chassis’ weight. Then turn each spike by the same amount, for
instance one more full turn. This should ensure that the load is evenly applied on all four spikes.
It is worth using a spirit level to ensure that the L1 is perfectly level. If it is not, adjust the spikes with the
screwdriver. Once this is done, simply check that all four spikes show the same resistance to turning. This
means that the spikes are rigidly coupled to the supporting discs and equally loaded.
Replace the top caps, using the suction cup to ensure that they are screwed tightly into place.

L1 User Manual 9
L1
preamplier
X1 external
power supply
unit or other
CH unit
cosmetic
caps
stacking
caps
support
discs
Stacking the L1 (or not)
2.6 Stacking the L1 (or not)
Also included in the accessory packs is a set of stacking caps. These polymer inserts allow owners to stack
the L1 chassis on top of other CH 1 Series components. The spikes and interface caps will ensure mechanical
grounding of the stacked chassis. However, this will inevitably compromise performance to some extent and
should only be done when space is at an absolute premium.
The optimum support for any CH unit is to mechanically ground it to a stable, dispersive structure, either
using the supplied spikes or an after-market solution. But if lack of space absolutely mandates the stacking of
CH components, then using the supplied spikes and stacking caps will provide the best possible solution.
The stacking caps simply screw into the top of the spike wells in the lower unit(s), taking the place of the
cosmetic caps. When a second unit is stood on top of them, its spikes can be wound down into the wells in
the caps, providing a stable, safe and easily managed stacking option that improves mechanical termination
and satises aesthetic and practical considerations.
Make sure that you retain the cosmetic top caps and store them safely as you may well require them in the
future if (or rather, when) your system or circumstances change.

2.7 Connections
With the L1 unit(s) placed and levelled, you are now ready to connect your signal cables.
The rear panel layout is shown below:
L1 User Manual 10
(1) RCA 1 left input
(2) BNC 1 left input
(3) RCA 2 left input
(4) BNC 2 left input
(5) XLR 1 left input
(6) XLR 2 left input
(7) XLR 3 left input
(8) XLR 4 left input
(9) XLR 1 left output
(10) XLR 2 left output
(11) RCA left output
(12) BNC left output
(13) Ethernet port for command interface
(14) Signal ground (analog GND) socket
(15) Multi pin socket for X1 power supply only
(16) Power on/off switch
(17) Power cord socket
(18) Fuses and voltage selector
(19) Signal ground (analog GND) socket. Place the
ground lift jumper in the lower position, between (19)
and (20), to connect signal ground (analog GND) to earth
(digital GND). Keep it in the upper position, between (14)
and (19), to store it
(20) Chassis earth (digital GND) socket.
(21) USB socket for software upgrades only
(22) RCA right output
(23) BNC right output
(24) XLR 2 right output
(25) XLR 1 right output
(26) XLR 4 right input
(27) XLR 3 right input
(28) XLR 2 right input
(29) XLR 1 right input
(30) RCA 2 right input
(31) BNC 2 right input
(32) RCA 1 right input
(33) BNC 1 right input
L1 audio unit rear panel connections
16
151413124
30 22 19
2
32
111098765
29 28 27 26 25 24 21 20 18 1723
3
31
1
33
You will note that as well as the array of conventional inputs and outputs, there are a number of other sockets
available which are used for control and update functions.

L1 User Manual 11
2.8.1 USB port
The USB port is not a digital audio input. It is dedicated to upgrading the rmware of the L1. Do not use it for
any other purposes. For more information please refer to the rmware update instructions in the dedicated
chapter of this manual.
2.8.2 Ethernet port
The Ethernet port is used for two closely related functions.
Connection to a local network router will allow control of the L1, its functions and conguration through the
CH Control App, loaded on an Android device.
In True Monaural, multi chassis congurations, the connection to an Ethernet network allows the two
separate audio chassis to communicate in a Master/Client relationship, so that control settings track
each other.
In a situation where a True Monaural, multi-chassis L1 is not connected to a network, an RJ45 Mirror lead
connected between the two audio units will allow control synchronicity. In this case, select ‘Direct-Link’ in the
‘Network / IP Settings’ menu of both audio units.
2.8.3 Local area network considerations
We strongly recommend that you construct a dedicated local network for both music streaming and system
control functions. It can be operated from locally located network switches, galvanically isolated from your main
household network using affordable and readily available optical converters. This will improve the responsiveness
of your setup, and keep as much high frequency noise out of your precious audio setup as possible.
2.8.4 Ground lift jumper
The grounding switch allows owners to combine or separate the signal and chassis ground. In a complete CH
system, this allows you to congure a single point, star grounding arrangement for the signal grounds. It can
also prove useful in a situation where ground-loops generate hum.
2.8.5 Inputs
Make sure that the L1 is switched off and disconnected from the wall socket.
Connect each pair of source interconnects to the input you have chosen. On a single chassis L1 the left inputs
are the top sockets and the right inputs are the lower ones. In a four-chassis, True Monaural set up, you will
connect the left inputs to one chassis and the right inputs to the other.
You have four balanced XLR inputs, two RCA and two BNC inputs per channel (or twice as many in a dual-audio
chassis True Monaural Extended conguration, where each separate channel chassis carries two input cards).
The inputs are all numbered. When making connections, ensure that you note which source is connected to
which input, so that you can identify each one correctly in the conguration menu. You can later give a more
meaningful name to the L1 inputs that are connected to a source component, and hide the ones you won’t use
for now.
2.8.6 Outputs
The L1 is equipped with two pairs of balanced XLR and single pairs of RCA and BNC outputs. This provides
plenty of exibility to connect your power ampliers, even for bi-amplication.
The connection of the L1 to your system will depend on the number (and type) of ampliers you are using.
Please see the conguration diagrams on the System Topology Sheet.
If you need additional outputs, then the four-chassis extended conguration will provide twice the number.

L1 User Manual 12
2.8.7 AC Power
With all the signal inputs and outputs connected, you can now turn on the rear panel power switch on the
L1 and switch the unit on. You should see the red bar in the CH logo in the top-left corner of each front
panel illuminate.
Please note that if you are using an X1 external power supply, you will still need to connect the IEC power
cord to the L1, as this supplies power for the control circuitry.
Please note that if you are using an X1 external power supply, you must connect the umbilical lead between
the L1 and the X1 before turning on either unit. Failure to do so could result in damage to either or both units.
Your L1 is now in standby mode and ready to be turned on and congured.
3 External power supply connector
The external power supply connector allows you to add the optional CH Precision X1 power supply to your L1
to further enhance performance. When the X1 is used, it completely replaces the L1’s internal power supply,
minimizing noise, reducing the noise-oor and increasing dynamic range and audio quality. With the X1
connected, the (small) standby transformer of the L1 remains active to ensure the unit’s wake up functionality,
so the power cord must be left in place.
X1 Voltage Power Max
Pos.1 +8V Digital 20W
Pos.2 -8V Digital 20W
Pos.3 GND Digital –
Pos.4 -8V Analog 20W
Pos.5 -19V Analog 40W
Pos.6 GND Digital –
Pos.7 +19V Analog 40W
Pos.8 +8V Analog 20W
Pos.9 +11.7V Digital 40W
Pos.10 +5.5V Digital 55W
Pos.11 +3.4V Digital 75W
Pos.12 GND Digital –
Pos.13 GND Digital –
Pos.14 Command –
Pos.15 +10.5V Analog 50W
Pos.16 Command –
Pos.17 GND Digital –
Pos.18 +8V Digital 20W
Pos.19 GND Analog –
Front view

L1 User Manual 13
4 How to congure and operate your L1
Your L1 is controlled via the provided infra-red remote control, the dual rotary knob to the right-hand side of the
display, or via the CH Control App. If the L1 is not detected by the CH Control Android app yet, the initial set up
should be done using the rotary control knob.
In use, your L1 has two operating modes: Normal mode and Menu mode.
1. External ring rotate Left [<<E]
2. Central ring rotate Left [<<C]
3. Central knob push. There are two types of push:
Normal Push [NP] and Long Push [LP]
4. External ring rotate Right [E>>]
5. Central ring rotate Right [C>>]
User control knob movements
1
2
3
4
5

L1 User Manual 14
(1) Handled channel (in true monaural) or channel pair
(in dual monaural)
(2) Mute indication. If the 7 symbol is present, the
output is muted
(3) Volume
(4) Polarity (phase) indication. If the H symbol is
present, polarity is reversed
(5) External power supply indication. When an
external power supply is connected and engaged,
< symbol is displayed and internal power supply is
turned off
(6) Monaural mode indication. If MONO is displayed,
content of both channel are summed up (L+R) and
output on both L and R output
(7) Impedance termination indication. High-Z is
displayed when no termination resistor is engaged,
600 or 300 Ohm when a termination resistor is
activated
(8) Input coupling state. Direct coupling means there
is absolutely no capacitor in the signal path, DC
blocking means the selected input goes through
a high performance polypropylene capacitor
(9) Input source name. Each input source can be
renamed through L1’s menu
4.1 Control actions in normal mode
In general use, the rotary control allows you to switch the L1 on and off, select inputs or short-cut functions and
adjust the volume level.
4.1.2 To turn on the L1
With the unit in standby, use a short press on the central knob [NP]. The red bar LED in the CH logo will start to
ash and the display will start to operate.
Normal mode display elements
9
8
123
4
567

L1 User Manual 15
4.1.3 To select an input
Rotate the outer ring left [<<E] or right [E>>]. The display will show the selected input.
4.1.4 To alter volume
Rotate the central knob left [<<C] or right [C>>]. The display will give a numerical and graphical readout of
volume level.
4.1.5 To engage shortcuts (mute, balance, phase, etc.)
Use repeated Short pushes on the central knob [NP] to cycle through shortcut options. Display will show
selected shortcut function:
Rotate control knob left [<<C ]/[<<E ] or right [C>>]/[E>>] to alter shortcut parameter – mute/unmute etc.
Note that the current input is automatically pre-selected for all input-specic parameters that are congured
through a shortcut.
4.1.6 To enter menu
After the last shortcut, comes a screen labeled Detailed Setup. With the display showing Detailed Setup, rotate
either the central or external control right [C>>]/[E>>] to enter Menu Mode.
4.2 Navigating the setup menus
Once in Menu Mode, the various menu options are shown on the display and navigated using the central
control knob.
The display shown above is the main Menu, with the various sub-menus shown in the left column and the
parameters adjustable in the selected menu (in this case the Audio Settings menu) in the right column.
Rotating the central knob moves the menu selection up and down the left column of the screen (the selected
sub-menu/parameter is highlighted). As each sub-menu/parameter is selected, the options available will be
shown in the right column.
Once the correct menu/parameter has been selected, a short push on the central knob [NP] or [E>>] will enter
that selection. Once you have navigated to the correct menu and set the required parameter, another short
push on the central knob [NP] will store that setting.
L1 set up screen items

L1 User Manual 16
Note that some parameters are input-specic, while others are global. For instance, you can individually adjust
the input gain or coupling (direct or cap) of each L1 input, while the absolute phase polarity is a global parameter.
4.3 Menu options
If you study the menu tree laid out below, you can see the various options and where to nd them. It may looks
confusing to start with, but it soon becomes clear and easy to navigate.
Below the menu tree is a list of the various sub-menu options and their signicance. These options are the key
to conguring your L1 to deliver the best performance, tailored user interface and coupling with your system.
It is worth studying the various options and their importance, as they will directly affect your enjoyment of
your system.

L1 User Manual 17
L1 preamplier menu structure

4.3.1 Global audio settings
Mute
Mutes or unmutes the audio output.
Phase polarity
Allows you to reverse the absolute phase of the audio output.
Channel mode
Left and right input signals can be summed together to generate a monaural signal. Default value of this
parameter is stereo. Obviously, this feature is not available with a four chassis, True Monaural L1 setup, as
there is no easy way to combine the monaural channels of the left and right L1 chassis.
Balance / Channel gain
6 dB of L/R balance control in 0.5 dB steps for an L+R dual monaural L1.
±6 dB of left, right, left surround, right surround, center or sub channel gain for other L1 congurations (either
True Monaural or surround channel conguration)
Maximum start volume
Upon startup, the L1 normally resumes operation at its previous volume level. This setting allows you to limit
the start up level to avoid bad surprises, in case the L1 was previously used at a very high volume level.
Maximum volume
User-congurable absolute volume limit for the L1 (-30dB to 0dB in 10dB steps, or no limitation – up to
+18dB).
4.3.2 Input-specic audio settings
Input type
Selects whether the selected input is a standard (volume controlled), hidden or By-passed (processor) input.
Hidden outputs will be removed from the source switching cycle so that only active sources appear.
Input coupling
Sets individual coupling type (DC or AC) for each input.
DC coupling delivers superior stability, dynamics and sound-staging. AC coupling prevents DC noise entering
the L1 from a source connected to that input – useful for blocking DC generated by tubes during their warm
up cycle for instance.
Input impedance
Sets individual impedance termination per input.
High impedance (47kΩ for single-ended inputs, 94kΩ for balanced inputs) means the input won’t draw any
current from the upstream device’s output, delivering the best possible resolution and dynamics.
600Ω (300Ω for single-ended inputs) means a termination resistor is activated, increasing the noise immunity
of the interconnect while drawing a bit of current from the upstream device’s output. This eliminates induced
noise at the cost of dynamic range and precision.
Input gain
Sets input gain for each individual input, ±6dB in 0.5dB steps.
Allows owners to equalize volume levels for different inputs and set system gain for optimum dynamic
performance.
Input calibration
Analyzes the DC output level of upstream devices to best adapt the L1’s DC-cancellation scheme.
L1 User Manual 18

L1 User Manual 19
4.3.3 Display settings menu
Input name
Each input can be allocated a specic name or identier, up to 12 letters or numerals long. Text is entered
using the rotary control. Scroll through the alpha/numeric listing until you have the letter, number, space or
punctuation required. A short press [NP] saves that selection and shifts the cursor to the next space. Don’t
forget to save the name with a short press [NP] when complete. Alternatively, you may want to rename your
L1 inputs directly from the Android CH Control App.
Display mode
Allows the user to choose what information is displayed and whether the display remains on or switches off
after a short time. Options are volume readout scale, general status display or Off.
Front LED
Allows the user to turn the red power LED off when the units are active rather than in standby.
Display brightness and gamma
Allows you to set the brightness of the display in operating mode (10 – 100%), and to ne tune the high
brightness gamma curves to perfectly match the brightness and color or other displays.
Display brightness (dimmed)
Allows you to set the brightness of the display when dimmed between operations (10 – 30%), and to ne tune
the low brightness gamma curves to perfectly match the brightness and color or other displays.
Display color
Lets the user select display color from a choice of seven standard shades or a user dened RGB color.
4.3.4 Shortcut menu
The L1 allows you to establish up to six shortcuts, taking you directly to almost any parameter in any menu. The
L1 is pre-programmed with Mute and Phase Polarity as shortcuts one and two. After scrolling through the latest
shortcut, the next screen that the L1 displays is the entry port to the L1 menu. It reads Detailed Setup.
4.3.5 Network menu
Status
Shows a list of compatible devices detected on the LAN.
Role
When physically connected to a network, the L1 can ignore this network (ofine) or connect to it as being the
master (it will transmit infra-red received commands to all compatible client units) or as a client (it will ignore
remote control commands and receive commands from the master device).
This networking facility allows information sharing among CH products (such as sound level for multichannel
congurations).
Room number
Denes the room in which room the L1 is for multi-room applications.
This prevents CH Precision units connected to the same network but located in different systems/rooms to
interact with each other.
IP settings
Auto should be selected if the L1 is connected to a router with DHCP server feature.
More advanced settings are available if needed.

L1 User Manual 20
Wake-on-LAN
If No is selected, the L1 can’t be woken up by the app. Standby mode will consume less than 0.5W.
When Only if PoE is selected, the L1 can only be woken by the app if connected to a Power-over-Ethernet
switch. Standby mode will draw less than 0.5W from the mains plug.
If Yes is selected, the L1 can always be woken up by the app. Standby mode will draw less than a couple of
watts from the mains plug.
Power off command
If Yes is selected, the L1 will enter standby mode when it receives a Power Off command from the LAN. It will
remain on if No is selected. This is useful if you want to keep your L1 on even when you turn off the rest of
your system.
Network knowledge
The L1 keeps track of all discovered devices, in order to turn them on if it is set as a Power Master. If the audio
system evolves, the list of devices can be cleared by this function.