CH L10 User manual

L10 Dual Monaural Line Preamplier
User Manual

Dear Valued Customer,
We are honored that you chose the L10 Dual Monaural Line Preamplier.
Our team has made every effort in the design and manufacture of this
top quality versatile and future-proof product and is proud to present it
to you. We hope your L10 preamplier will bring you uncountable hours
of emotional connection with your music collection.
But before you embark on your musical journey, we kindly request
your attention to the information contained in this manual. The L10, as
you will discover in the following pages, is a Swiss precision product
designed for ultimate performance and exibility. However, delivering
that ground breaking sonic and musical excellence requires your unit to
be setup and operated correctly. That is what this manual is all about.
If you have any questions or require assistance, please don’t hesitate to
contact your authorized dealer.
Once properly installed and congured, we are condent that you will
enjoy your L10 preamplier for many years.
The Concert has just begun...
Cossy F.
Heeb T.
L10 User Manual 2

Table of contents
1 Introduction
1.1 Global audio options4
1.2 Input-specic options 4
1.3 More user congurable options 4
1.4 The purpose of this manual 4
2 Setting up your L10
2.1 Safety notice 5
2.2 Unpacking 5
2.3 Package contents 6
2.4 Placing your L10, connecting the two chassis together and installing the spikes 6
2.5 Stacking the L10 (or not) 8
2.6 Connections 9
2.6.1 USB port 10
2.6.2 Ethernet port 10
2.6.3 Local area network considerations 11
2.6.4 Ground lift 11
2.6.5 Inputs 11
2.6.6 Outputs 11
2.6.7 AC Power 11
3 How to congure and operate your L10 12
3.1 Control actions in normal mode 13
33.1.1 To turn the L10 on 13
3.1.2 To select an input 13
3.1.3 To alter volume 13
3.1.4 To engage shortcuts (mute, balance, phase, etc.) 13
3.1.5 To enter menu 14
3.2 Navigating the setup menus 14
3.3 Menu options 14
3.3.1 Audio settings menu 16
3.3.2 Input-specic settings menu 16
3.3.3 Display settings menu 17
3.3.4 Shortcut menu 17
3.3.5 Network menu 18
3.3.6 Factory settings menu 19
3.4 Handheld remote control 20
3.4.1 Batteries 20
4 Firmware update
4.1 Preparing the USB stick 21
4.2 Updating the unit’s rmware 21
4.3 Emergency rmware update procedure 22
5 Troubleshooting 23
6 Specications 24
L10 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 L10 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 L10’s operation if you are
to enjoy its maximum possible performance.
1.1 Global audio options
Mute
Absolute phase polarity
Global or local feedback
Mono mode
Balance / channel gain (up to 6dB of gain on either channel in 0.5dB steps)
Maximum starting volume / global volume limit
L10 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
1.4 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 L10’s many options and that your preamplier delivers the best possible performance.
L10 User Manual 4

2 Setting up your L10
2.1 Safety notice
Like any piece of sensitive audio electronics, there are certain precautions that you should take in handling
and installing your CH Precision L10 in order to protect yourself, your new equipment and your system.
Always handle with care. The L10 preamplier components are heavy, so have someone to help you when
unpacking, re-packing or moving them around.
Install both chassis of your L10 preamplier on strong, stable supports capable of holding their weight.
It is best to clear/prepare the supporting surfaces in advance.
Do not install your L10 preamplier near water.
Do not expose the units to any kind of liquid.
Do not install them under direct sunlight or near any heat source, such as a radiator or other apparatus
generating heat.
Do not install them in a conned space and make sure there is sufcient ventilation and airow around
and beneath each unit.
Do not operate them under high ambient temperature (>40°C) or in extremely high humidity conditions.
Only use options and accessories specied or recommended by CH Precision.
Do not open the units or try to service them yourself. Always refer to a qualied technician for service,
maintenance or upgrades. Failure to do so will void the unit’s warranty
2.2 Unpacking
The L10’s cartons are large and contain both the components and all of their accessories. You will need an
open, preferably carpeted area in which to unpack them. Please also ensure that the rack or support space
on which the L10 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. Each carton consists of an inner box and outer sleeve. It is easiest to empty one box at a time,
before reassembling it to save space.
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 L10 component 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 (if present) and the four levelling/grounding spikes.
We recommend storing the Accessory Packs in a readily accessible place, so don’t put them back in the
cartons with the plastic bags when resealing them.
L10 User Manual 5

L10 User Manual 6
2.3 Package contents
Your L10 should arrive in two substantial cartons. Once unpacked these cartons and packaging materials should
be stored safely in case you ever need to transport your units. When moving or transporting the L10 units, this
should always be done in the original packaging.
The audio chassis carton should contain:
The L10 preamplier
Four composite titanium/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 smaller, dimpled stacking caps
–a USB stick containing the latest CH Precision rmware
The power supply chassis carton should contain:
The L10 power supply with two captive umbilical cables
A power cord
Four composite titanium/polymer spikes
An accessory box containing:
–four support discs
–four smaller, dimpled stacking caps
In case of damage to either chassis, or missing components, please contact your authorized dealer immediately.
If your L10 units are still very cold from transport, please let them warm to room temperature in order to avoid
condensation developing inside them.
2.4 Placing your L10, connecting the two chassis together and installing
the spikes
Before positioning your L10 units, 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 of the audio chassis 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 levelling / grounding spikes. If an alternative system
is to be used, please note that the lower part of each foot that is held by three screws can be removed to
provide an easier access to the M10×1.5 central thread where a third-party system can be attached. Please
note that the CH Precision casework is designed to support weight and ground energy in the corners only. If
you choose to use third party supports they should be positioned in the same location as the unit’s original
feet and we do not recommend stacking components except using the supplied spikes and caps.
If you do plan to use the CH spikes, use the blue suction cup to liftremove the four circular covers in the top
plate of each unit. Gently insert the titanium 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 titanium spike.

L10 User Manual 7
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 on the L10 power supply 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 the units. Each chassis is heavy and the feet are tted with rubber rings to protect
the supporting surface, which makes it hard to slide the units. Having a partner to lift and help place each
chassis will make things considerably easier.
Place the power supply rst, carefully planning the path to be taken by the two umbilicals before positioning
the unit.
Gently pull the umbilicals into position to be connected to the audio chassis, noting which is which thanks
to the color identication rings.
Move the audio unit as close as possible to the rack/support so that you can connect the umbilicals before
moving it back into position. Connect the left umbilical to the left input socket and the right umbilical to the
right input socket. The plugs on the umbilicals will only connect in one position, so turn the connector in the
socket until you feel it engage and then gently push it home until you hear a locking sound.
DO NOT force the umbilical connectors into the sockets.
This will risk damaging the connecting pins and disable your L10.
If you feel resistance when you insert the connector, check that you are trying to connect the proper pairs
of umbilicals and connectors together. Please note that the two connectors have the same diameter but
a different number of pins, so it is not possible to plug an umbilical in the wrong connector.
Each L10 chassis 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. 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 of the four spikes until they touch the surface (or disc)
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 L10 units are perfectly level. If they are not at this point of the
setup, 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. Their magnetic coupling will hold them in place.

L10 User Manual 8
2.5 Stacking the L10 (or not)
Also included in the accessory packs is a set of small, dimpled stacking caps for each unit. These polymer
inserts allow owners to stack the L10 units on top of each other, or on other CH components. However, this will
inevitably compromise performance 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, 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.
L10
preamplier
unit
L10 power
supply unit
magnetic
cosmetic
caps
stacking
caps
support
discs

2.6 Connections
With the two (or four) L10 units placed and levelled, you are now ready to connect your signal cables.
The rear panel layout is shown below:
L10 User Manual 9
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. Ground lift: switch on to connect signal
ground (analog GND) to earth (digital GND)
15. Analog power supply socket, to be
connected to corresponding cable from
power supply unit
16. Control (digital) power supply socket, to be
connected to corresponding cable from power
supply unit
17. Signal ground (analog GND) socket
18. Chassis earth (digital GND) socket
19. USB socket for software upgrades only
20. RCA right output
21. BNC right output
22. XLR 2 right output
23. XLR 1 right output
24. XLR 4 right input
25. XLR 3 right input
26. XLR 2 right input
27. XLR 1 right input
28. RCA 2 right input
29. BNC 2 right input
30. RCA 1 right input
31. BNC 1 right input
L10 audio unit rear panel connections
16151413124
28 20 17
2
30
111098765
27 26 25 24 23 22 19 1821
3
29
1
31

L10 User Manual 10
1. Analog power supply umbilical cable, to be
connected to the corresponding socket in the
audio unit
2. Control (digital) power supply umbilical cable, to
be connected to the corresponding socket in the
audio unit
3. Chassis earth (digital GND) socket
4. Power on/off switch
5. Fuses and voltage selector
6. Power cord socket
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.
2.6.1 USB port
The USB port is not a digital audio input. It is dedicated to upgrading the rmware of the L10. 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.
2.6.2 Ethernet port
The Ethernet port is used for two closely related functions.
Connection to a local network router will allow control of the L10, its functions and conguration through the
CH Control App, loaded on an Android device.
In True Monaural conguration (standard or extended) 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.
One unit should be set as ‘Master’ and the other as ‘Client’, in the ‘Network / Role’ menu.
In a situation where a four–chassis L10 is not connected to a network, an RJ45 Mirror lead connected
between the two audio units will allow control synchronicity. In that case, select ‘Direct-Link’ in the
‘Network / IP Settings’ menu of both audio units.
56
3 4
L10 power supply unit rear panel connections
21

L10 User Manual 11
2.6.3 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.
2.6.4 Ground lift
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.
2.6.5 Inputs
Make sure that the L10 is switched off and disconnected from the wall socket.
Connect each pair of source interconnects to the input you have chosen. On a Dual Monaural L10 the left
inputs are the top sockets and the right inputs are the lower ones. In a four-chassis, True Monaural (or True
Monaural Extended) 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 (and twice as many in four-
chassis, Extended conguration).
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 L10 input that are connected to a source component, and hide the ones you won’t
use for now.
2.6.6 Outputs
The L10 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 L10 to your system will depend on the number (and type) of ampliers you are using.
Please see the conguration diagrams on the Quick Start Guide.
If you need additional outputs, then the four-chassis extended conguration will provide twice the number.
2.6.7 AC Power
With all the signal inputs and outputs connected, you can now connect the IEC power cord to the input
socket on the L10 power supply and switch the units on. You should see the red bar in the CH logo in the
top-left corner of each front panel illuminate.
Your L10 is now in standby mode and ready to be turned on and congured.

L10 User Manual 12
3 How to congure and operate your L10
The L10 amplier is operated either from the unit’s front panel display and concentric control or from the
CH Control app. The initial set up should be done using the front panel buttons and the menus shown on the
display. Once congured for inclusion in the Control App, all parameters can be adjusted or re-set remotely.
In use, your L10 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

L10 User Manual 13
3.1.2 To select an input
Rotate the outer ring left [<<E] or right [E>>]. The display will show the selected input.
3.1.3 To alter volume
Rotate the central knob left [<<C] or right [C>>]. The display will give a numerical and graphical readout of
volume level.
3.1.4 To engage shortcuts (mute, balance, phase, etc.)
Short push on the central knob [NP] to cycle through shortcut options. Display will show selected shortcut
function: Rotate either 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 parameter that are
congured through a shortcut.
1. Handled channel (in true monaural) or channel pair
(in dual monaural)
2. Indicates if output stage uses global feedback
(GLOBAL-FB) or local feedback (nothing is displayed
in this case)
3. Absolute phase polarity indication. If the symbol
is present, polarity is reversed
4. Mute or mono indication. If the symbol is
present, the L10 output is muted.
5. Volume
6. Impedance termination indication. High-Z
is displayed when no termination resistor is
engaged, 600Ω or 300Ω when a termination
resistor is activated.
7. Input coupling state. DIRECT COUPLING means
there is absolutely no capacitor in the signal path,
CAP COUPLING means the selected input goes
through a high performance polypropylene capacitor
8. Input source name. Each input source can be
renamed through L10’s menu
3.1 Control actions in normal mode
In general use, the rotary control allows you to switch the L10 on and off, select inputs or short-cut functions
and adjust the volume level.
8
76
1 2 3 4 5
Normal mode display elements

L10 User Manual 14
3.1.5 To enter menu
After the last shortcut is a screen labelled Detailed Setup on the display. With the display showing Detailed
Setup, rotate either the central or external control right [C>>]/[E>>] to enter Menu Mode.
3.2 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.
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 all L10 input, while the feedback setup (local or global) or absolute
phase polarity are global parameters. All input-specic parameters are located in the INPUTS menu.
3.3 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 L10 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.
L10 SETUP screen items

L10 User Manual 15
L10 preamplier menu structure
XLR 1
Normal mode
Shortcut mode SHORTCUT 1 SHORTCUT N EXITSHORTCUT 2 ENTER
L10 SETUP L10 SETUP >>
AUDIO
AUDIO >>
MUTE
AUDIO >>
PHASE POLARITY
AUDIO >>
FEEDBACK
AUDIO >>
CHANNEL MODE
L10 SETUP >>
DISPLAY
DISPLAY >>
DISPLAY MODE
DISPLAY >>
FRONT LED
DISPLAY >>
BRIGHTNESS NORMAL
DISPLAY >>
COLOR
COLOR>>
EDIT CUSTOM
EDIT CUSTOM >>
GREEN
EDIT CUSTOM >>
RED
EDIT CUSTOM >>
BLUE
Menu mode
L10 SETUP >>
SHORTCUTS
SHORTCUTS >>
SHORTCUT 1
SHORTCUTS >>
SHORTCUT 2
SHORTCUTS >>
SHORTCUT 3
SHORTCUTS >>
SHORTCUT 4
SHORTCUTS >>
SHORTCUT 5
SHORTCUTS >>
SHORTCUT 6
L10 SETUP >>
FACTORY
FACTORY >>
FIRMWARE VERSION
FACTORY >>
UPDATE FIRMWARE
FACTORY >>
FACTRY RESET
FACTORY >>
CALIBRATE
AUDIO >>
MAX START VOLUME
L10 SETUP >>
NETWORK
NETWORK >>
ROLE
NETWORK >>
STATUS
AUDIO >>
MAX VOLUME
NETWORK >>
ROOM NUMBER
FACTORY >>
INSTALLED OPTIONS
FACTORY >>
REMOTE CONTROL CODES
DISPLAY >>
BRIGHTNESS DIMMED
NETWORK >>
IP SETTINGS
NETWORK >>
WAKE-ON-LAN
NETWORK >>
POWER OFF COMMAND
NETWORK >>
NETWORK KNOWLEDGE
L10 SETUP >>
INPUTS
Selected input >>
TYPE
Selected input >>
ALL PARAMS RESET
Selected input >>
COUPLING
Selected input >>
IMPEDANCE
Selected input >>
GAIN
Selected input >>
CALIBRATION
Selected input >>
NAME
INPUTS >>
Input selection
AUDIO >>
BALANCE / CHANNEL GAIN

3.3.1 Audio settings menu
Mute
Mutes or unmutes the audio output.
Phase polarity
Allows you to reverse the absolute phase of the audio output.
Feedback
Selects if the L10’s output stage features local or global feedback.
Local feedback setting (the default setting on the L10) is more musically expressive.
Global feedback setting delivers greater control and precision. When selected, GLOBAL-FB shows in the
status display screen.
We recommend comparing them and selecting the one you enjoy the most in your system. Your preferred
choice may vary with the musical program.
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 L10 setup,
as there is no easy way to combine the monaural channels of the left and right L10 chassis.
Balance / Channel gain
6 dB of L/R balance control in 0.5 dB steps for an L+R dual monaural L10.
±6 dB of left, right, left surround, right surround, center or sub channel gain for other L10 congurations
(either true monaural or surround channel conguration).
Maximum start volume
The L10 normally resumes its previous volume level upon startup. This setting allows to limit it to a lower
value to avoid bad surprises if the L10 was previously turned off while a very high volume level was used.
Maximum volume
User-congurable absolute volume limit for the L10 (-30dB to 0dB in 10dB steps, or no limitation
– up to +18dB).
3.3.2 Input-specic settings menu
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 soundstaging. AC coupling prevents DC noise entering the L10 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.
L10 User Manual 16

L10 User Manual 17
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 upstream device’s DC level to best adapt its DC-cancellation scheme.
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 L10 inputs directly from
the Android CH Control App.
3.3.3 Display settings menu
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.
3.3.4 Shortcut menu
The L10 allows you to establish up to six shortcuts, taking you directly to almost any parameter in any menu.
The L10 is preprogrammed with Mute and Phase Polarity as shortcuts one and two. After scrolling through the
latest shortcut, the next screen that the L10 displays is the entry port to the L10 menu. It reads Detailed Setup.

L10 User Manual 18
3.3.5 Network menu
Status
Shows a list of compatible devices detected on the LAN.
Role
When physically connected to a network, the L10 can ignore this network (ofine) or connect to it as either
the master unit (it will transmit push-button commands to all compatible client units) or as a client (it will
ignore push-button entries and receive commands only from the master device). This networking facility
allows system-wide sharing of commands among CH products (such as mute or power up/down).
Room number
Denes the room in which the L10 is located for multi-room applications.
This prevents CH Precision units connected to the same network but located in different systems/rooms
to interact with each others.
IP settings
Auto should be selected if the L10 is connected to a router with DHCP server feature.
Direct-Link should be selected when an RJ45 Mirror lead directly connects a Mater L10 to a Client L10.
More advanced settings are available if needed.
Wake-on-LAN
If‘No’is selected, the L10 cannot be switched on from the CH-Control App.
If‘Only If POE’ is selected, connecting the L10 to a Power Over Ethernet switch will allow it to be switched
on via the CH-Control App (Standby consumption will be less than 0.5W).
If‘Yes’ is selected, the L10 can always be switched on by the CH-Control App (Standby consumption will be
less than 2W).
Power off command
If Yes is selected, the L10 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 L10 on even when you turn off
the rest of your system.
Network knowledge
The L10 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.

3.3.6 Factory settings menu
Firmware version
Indicates the version of the rmware that the L10 is currently running. Periodically check CH Precision’s
website to see if a newer version is available. It could add new features or correct bugs.
Note that the CH Control App indicates that a device is not up to date by displaying its name in orange
instead of red.
Update rmware
Selecting Update launches the L10 rmware update process. A USB ash disc drive with a valid set of
rmware must be inserted in the A-shaped USB port. Please report to the corresponding section of this
manual for more detail on rmware update procedure.
Factory reset
Resets all parameters to their default factory values. This can be useful if you made some changes that you
don’t know how to revert. Note that it is also possible to reset small subsets of parameters to their default
values from other locations in the menu tree.
Serial number
Displays the serial number of your L10. This serial number is also written on a sticker at the back of your L10.
Installed options
List the hardware conguration of your L10.
Calibrate
Launch automated self calibration to measure and compensate DC at all stages of the L10 signal path.
This calibration process is conducted at CH Precision factory prior to packing any L10.
In order to avoid overriding these factory measured valued with inaccurate ones, the L10 must be powered
for at least 1 hour before this function is available, to ensure the L10 is warmed up and all internal stages
have stabilized.
Remote control codes
Selects which set of infra-red RC5 commands the L10 will respond to.
Pre1 is the standard RC5 Preamplier codes as used by the remote control handset supplied
with the L10 and L1.
Pre2 is the alternate set of RC5 commands used by the C1.
When ‘None’ is selected, the L10 can no longer be controlled by an infra-red remote control.
L10 User Manual 19

3.4 Handheld remote control
The L10 preamplier is delivered with an infra-red remote to drive the unit’s basic operational functions.
The provided remote control is not intended to be used to congure the unit. It can be magnetically attached
to the side panels of the L10 audio unit for storage.
3.4.1 Batteries
If the Remote Activity LED fails to light then you will need to change the batteries in the handset.
The T-10 torx screws that hold the black bottom plate can be removed with the provided screwdriver.
The remote takes two AAA batteries.
L10 User Manual 20
2
1
3
4
5
6
L10 preamplier infra-red remote control
1. Remote control activity LED
2. Mute [NP] / Standby [LP] button
3. Volume up [NP] / fast volume up [LP] button
4. Volume down [NP] / fast volume down [LP] button
5. Next input [NP] / absolute phase inversion
[LP] button
6. Previous input [NP] / local/global feedback
[LP] button