Manual - Leema Acoustics
HANDBOOK
LEEMA ACOUSTICS
CONSTELLATION SERIES
LIBRA PRECISION DAC
L E E M A AC O U S T I C S
Issue 1
PAGE LEFT INTENTIONALLY BLANK
2
Index
EC Declaration of Conformity ....................................................................... 4
Introduction .................................................................................................. 5
Safety Advice ................................................................................................. 6
Libra DAC Overview ...................................................................................... 7
Environmental, Made in the UK……...…..………………… 7
Contact Us……………………….…………………………… 7
Input Connections ......................................................................................... 9
Analogue Inputs:- RCA/Cinch 3.5mm Jack, XLR ....……... 9
2
Digital Inputs:- OPT, Coax, USB, I S, AES/EBU ….…….... 9
Output Connections ……………………………………………………………..10
Analogue Outputs:- XLR, RCA/Cinch .…..………...……... 10
Headphones, LIPS ………..………….……….…………..... 10
Front Panel ..……….………………………………………………………..…11/12
Remote Control ............................................................................................ 13
Setup Menus ............................................................................................14-19
LIPS ............................................................................................................... 20
LIPS Codes, IR Codes…………………..……………..… 20/21
Audio Specifications ..........................................................……………….... 22
USB Operation ...……………………………………………………………... 23-31
BlueTooth and Limited Liability statement…………………………….……..32
3
4
Severn Farm Industrial Estate
Welshpool
Powys
UK
of
2006/95/EC The Low Voltage Directive 2004/108/EC The Electromagnetic Compatibility Directive
Name: Nia Davies
Position: Managing Director
Done at: Leema Electro Acoustics Ltd.
On: 31/07/2015
14
Signed by: .................................................................................................................................................
I hereby declare that the equipment named above has been designed to comply with the relevant sections of the above referenced specifications.
The unit complies with all applicable Essential Requirements of the Directives and Standards.
BS EN60065; 2002 Electrical Safety Requirements EN60065; 2002 / IEC60065; 2001
BS EN 55020; 2002 EMC Immunity EN55020; 2002 / CISPR 20; 2002
BS EN 55013; 2001 EMC Emissions EN55013; 2001 / CISPR 12; 2001
BS EN 61000-3-2; 2001 EMC Limits for Harmonic Emissions EN61000-3-2; 2000 / IEC61000-3-2; 2000
BS EN 61000-3-3; 1995 EMC Limits for Voltage Fluctuations EN61000-3-3; 1995 / IEC61000-3-3; 1994
Standard. No. Name International Equivalents
is in conformity with the applicable requirements of the following standards
hereby declare that: Equipment: Libra Digital to Analogue Converter,
in accordance with the following Directive(s):
Leema Electro Acoustics Limited
We
EC Declaration of Conformity
In accordance with EN ISO 17070-1:2004
Introduction
Congratulations on your purchase of Leema’s class-leading Libra DAC.
The Leema range of products has been painstakingly engineered in the United Kingdom to
offer genuine state-of-the-art performance.
Partnered with suitable equipment, Leema products will provide audio performance far
beyond that of their competitors and will equal or better the performance of products
costing many times their purchase price.
The Leema Libra DAC provides playback for S/PDIF and USB digital sources. The board
comprises two separate interfaces, one for S/PDIF sources and one for USB playback.
The S/PDIF interface offers three co-axial inputs via RCA (Cinch) connecters and three
optical inputs using standard Toslink type connectors. Both interfaces offer all common
sampling rates, the Toslinks, from 32kHz to 192kHz at 16 and 24 bit resolution.
The coaxial and USB inputs offer all of the common data rates from 32kHz to 192kHz at 16
and 24 bit resolution. The USB interface operates in asynchronous mode using Leema’s
own hardware platform and firmware. The interface provides full electrical isolation from
the source computer, ensuring that noise from the computer’s power supply does not
degrade the audio performance. Both interfaces feature ultra-low jitter, due to their
precision master clocks.
In addition, there are two I2S inputs, one of which features configurable pin assignment.
There are also two AES/EBU connectors to allow connection to professional sources.
Purchasers should read and follow this instruction manual, paying particular attention to
the hardware and driver installation sections.
This manual has been written to enable you to achieve the very best performance and
maximum listening pleasure from your investment.
We wish you many years of pleasurable listening... Move Your World!
With best regards………….The Leema Team.
5
VERY IMPORTANT
Before connecting your new Leema Libra DAC to the rest of your system, please ensure
all required input/output cables are connected BEFORE inserting the mains power lead
and powering for the first time.
User installation and safety advice
Please ensure that the mains voltage of your new Libra Precision DAC is correct for your
region. The setting is displayed on a label above the mains power inlet.
The mains voltage setting is not user adjustable, therefore the DAC must be returned to
the manufacturer if any changes are required.
Ensure the mains supply is switched off at the wall socket, or unplugged before installing
or moving the DAC.
Do not use near water, for example do not place a potted plant on top of the unit or allow
drinks to be placed near the unit. If liquid is spilt in to the cabinet, remove the mains lead
from the wall immediately.
The DAC should then be returned to your dealer for safety testing before re-use.
Failure to do so may result in electric shock or even fire!
Do not use the DAC in damp conditions, e.g. outside of the house.
Keep away from direct sunlight and other heat sources and ensure adequate ventilation
around the DAC to maintain proper cooling. Units MUST NOT be stacked directly on top of
each other.
Never attempt to open the cabinet. There are no user adjustable parts inside and doing so
will invalidate the product warranty.
In the event of an electrical storm, remove the mains power lead from the wall outlet.
6
Overview
Libra is a state of the art DAC, capable of decoding the latest high bitrate audio formats
including DSD128 and DXD. It may be used as a system controller with an entirely
Leema system or as a preamp in a mixed system.
Environmental Issues
All waste materials generated as part of the manufacturing process are recycled.
The power drain from all Leema electronics, in standby or power off modes, has been
optimised to a negligible level.
All Leema products have been designed to attain full operational specifications and
sound quality within a few minutes of switch-on.
Made in the UK
Leema electronics are entirely designed and manufactured in the UK.
Contact Us
Leema may be contacted via our website: www.leema-acoustics.com
or by telephone: +44 (0)1938-559021
7
Rear Panel Connections
LIPS CONTROL
CONNECTIONS
BLUETOOTH
ANTENNA
FOR OPTIONAL
BLUETOOTH
MODULE
DIGITAL
INPUTS
OPTICAL
ANALOGUE 1
COAX
LIPS
LIPS 2
I2S
USB AES/EBU
ANALOGUE 2
ANALOGUE 3
ANALOGUE INPUTS, INDIVIDUALLY
SELECTABLE AS RCA/CINCH
OR XLR VIA PUSH SWITCH
OUTPUTS
RCA/CINCH
AND XLR
FIXED VOLUME OR
VARIABLE VOLUME
VIA PUSH SWITCH
8
POWER
INLET
Input Connections
Digital: Three coaxial and three optical inputs accept conventional S/PDIF digital
audio streams at up to 24 bit, 192 kHz data rates, plus DSD 64
USB: Leema's own class leading M1 USB interface provides a connection for
computer based audio replay. Windows, Mac and Linux based machines can be
accommodated. Windows machines will require a driver to be installed (included).
The USB interface can decode very high data rate audio including DSD 64, DSD 128
(using the DoP framework), very high resolution DXD at 24 bit 352.8 kHz and PCM
at 24 bit 384 kHz. The interface is fully asynchronous allowing for very precise control of
the data rate from the computer in a frame by frame basis. This ensures that the DAC
exhibits vanishingly low levels of jitter. Spinning electron galvanic Isolation completely
isolates the Libra from the computers noisy power supply. These two features ensure
that the quality of replay from a computer source is as good as is technically achievable.
RJ45: High end transports often feature an I2S output. There is a standard pin
configuration but not all manufacturers adhere to this. The Libra features two I2S
interfaces, one of which is pre-wired to meet the standard and the other has pin
connections definable in software. This allows any I2S transport to be connected to the
Libra.
AES/EBU: Professional equipment uses the AES/EBU standard for digital
audio transmission. The Libra allows for this with two standard professional XLR sockets.
Analogue: There are three analogue inputs which can be individually configured
to be unbalanced via RCA/Cinch connectors or balanced via XLR connectors.
Bluetooth: An optional Bluetooth module can be incorporated which allows for
music to be streamed from a suitably configured Android or Apple device.
9
Output Connections
Line Outputs: Line outputs to the pre-amplifier or power amplifier are available in both
balanced mode, via two XLR sockets, one for left and one for right, or unbalanced (single
ended) mode via a pair of RCA/Cinch sockets.
Headphone Out: A headphone output is available on the front panel.
The output uses a 3.5mm mini-jack as found on personal stereo headphones.
Headphones should have a minimum impedance of 32 Ohms.
It is advisable to unplug headphones before powering down the DAC.
LIPS connection
LIPS cables are directional and have one black end and one red. If the Leema Libra DAC
is controlling other units, the black connector should be plugged in to either LIPS socket
on the Libra DAC and the red connector plugged in to the next component. If the Libra
DAC is to be controlled, the black connector is connected to the master device and the
red connector is plugged in to either LIPS socket on the rear of the Libra DAC.
Two types of LIPS connection are available, Unbalanced for short range use using the
enclosed 4 pole connector lead.
Alternatively, where the controlling unit is remote from the amplifiers, a balanced LIPS
lead can be employed via 5 pin XLR. Please contact Leema to discuss your requirements.
Cables
Never underestimate the importance of good quality interconnecting cables. The higher
the system resolution, the more easily the differences between cables can be discerned.
Leema recommend Leema Linx cables for optimum system synergy.
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Front Panel Operation
Standby: The Standby button toggles Libra between ON and STANDBY. If a LIPS
connection is used, the power status of any other Leema component connected via LIPS
will also be controlled.
Input & UP/DN: In its normal mode (MENU/ESC button is unlit) the knob selects the
input source. The knob can be rotated in either direction in order to cycle through the
available input connections.
In menu mode (MENU/ESC button lit), rotating the INPUT & UP/DN knob will cycle
through the various menu setup options available.
Menu/Esc: Pressing the MENU/ESC button will enter the Libra's edit menu.
The button will light to display the machines status and the graphic display will now show
the various menu options available. Pressing the button again will leave the MENU mode
and the button will no longer be illuminated. At this point, any setting changes will be
committed to the Libra’s internal memory.
Select: The SELECT button is only active when in the menu edit mode (MENU/ESC
button is alight). Once a desired setting is displayed in the graphics screen, pressing the
SELECT button will activate the chosen setting and apply the required configuration.
Volume: The function of the Libra's VOLUME knob is definable in the user setup
menu and by the push switch on the rear panel.
States a or b below are defined by the switch on the rear panel next to the output sockets;
a. The Libra can be set to function like a normal DAC, with no onboard volume
control. You would use this mode if using the Libra in conjunction with an Integrated
amplifier such as a Leema Tucana, or a pre/power combination such as a Leema Pyxis
and Hydra amplifiers.
The volume control is still active for the headphone amplifier. However, the volume
control data is still output from the Libra's LIPS connections and can be used to remotely
control the onboard volume controls in other Leema products such as the Hydra II or
Elements power amplifiers.
b. Alternatively, the volume control can be enabled and will regulate the output
level in the conventional way. This mode would be used when the Libra is acting as a
preamplifier in a system with power amplifiers such as the Leema Hydra II or Elements
power amplifiers set to fixed gain (conventional) mode.
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Front Panel Operation Continued
Mute: When pushed, this button mutes the output by ramping down the volume to
zero and remains in this state while lit. A second push will restore the previous volume
level and the light will extinguish.
HT Direct: This button invokes a special mode for integration into a Home Theatre.
When selected, the Libra will automatically select the input from Analogue 3 that corresponds to the left and right output from a home cinema processor or a universal player
which has onboard multi channel decoding.
The volume will then ramp up to a predefined point which corresponds with unity gain
i.e. the voltage level coming in to the Libra is the same as the voltage level at its output
sockets.
MP3: The front panel MP3 input allows for the easy connection of a portable music
player or mobile phone/tablet computer using a simple 3.5mm jack lead.
Phones: The Libra features a very high quality dedicated headphone amplifier
capable of driving the majority of quality headphones (minimum impedance 32 Ohms) with
ease.
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Libra Remote Control Precision DAC commands
The Libra remote control is designed to operate a Leema
CD player, an amplifier and a DAC which allows the control of a
Leema system from just one remote control. Simply select the
device you wish to control and the correct buttons will be enabled.
Power: There are two power buttons. The left button (ALL)
turns all the units in a Leema system on or off simultaneously.
The right button (IND) allows individual units within an Leema
system to be turned on or off independently by first selecting the
required device button (CD, AMP or DAC) then pressing the “IND”
power button. When powered on, the unit initialises then, if
applicable, the last input selection will be restored and the volume
set to a low level.
Mute: Pressing the mute button once while the system is
playing will cause the volume to rapidly fade to zero;
“---” is then displayed. A second push of the button will restore the
volume level to its previous setting.
Input: The input - and + buttons cycle through the available input
sources, one-button push at a time. The audio mutes for a fraction
of a second between selections. Inputs may also be selected
directly by using the numeric buttons. Note that the DAC button
must have been pressed previously for these buttons to address
the Libra Precision DAC.
Volume: This function only operates if the DAC has its local
volume control mode enabled via the back panel switch, or is
operating as a LIPS master for an amplifier connected via LIPS.
Otherwise it will control the volume of the amplifier directly.
Two buttons, (+) for up and (-) for down, control the volume.
Short presses on the volume buttons will change the volume in
small increments. Press and hold the volume up or down
buttons to smoothly raise or lower the volume.
In order to change the batteries in your remote control, simply unscrew
the rubber feet from the base and remove the base plate.
The battery holder is then accessible. Replace the two AAA batteries,
taking care to ensure they are fitted the correct way round…..plus to + and minus to –.
Good quality Alkaline type batteries must be used.
To reassemble, simply replace the base plate and carefully screw in the rubber feet.
Do not overtighten.
13
Setup Menus, Basic Settings.
1> SET ABSOLUTE PHASE
Options:
1. Non Inverting
2. Inverted!
Explanation> There are occasions where the absolute phase of a recording or indeed
some element of the reproduction system has become phase reversed resulting in the
loudspeaker cones moving backwards when they should be moving forwards.
Some people are sensitive to phase so this menu setting allows for the phase to be
reversed (inverted).
2> SET FILTER BANDWIDTH
Options:
1. Normal
2. Wide
3. Auto
-3 dB at 42 kHz
- 3 dB at 82 kHz
Explanation> The minus 3 dB point of the output filter applied to the audio signal can be
adjusted here to suit the system sample rate.
Source recordings which were produced using a sample rate of 48 kHz or less will contain
no usable audio content above about 22 kHz, with a CD file the practical limit is a little
over 20 kHz. Filtering is applied to the digital signal such that any artifacts above these
limits are removed.
Higher sample rate recordings have a higher high frequency limit and therefore the filter
can be opened out to allow high frequency information up to about 40 kHz to be passed.
Some people prefer to listen to low sample rate material with high (wide) filtering applied.
Others like high sample rate material with low (normal ) filtering applied.
Settings 1 or 2 allow normal or wide filtering to be applied to all sample rates.
Setting 3 (Auto) will apply the appropriate filter frequency automatically, depending on the
system sample rate.
14
Setup Menus, Basic settings cont’d
3> HT DIRECT INPUT
This menu toggles the status of analogue input 3. This input can be assigned as the front
left and right channel input source to be used in a home cinema setup, usually from a
home cinema processor or a suitable player with integrated surround sound decoding.
Options:
1. HT Input not used.
2. HT> Analogue 3
Explanation> When set to “not used”, the analogue input 3 is accessible as a conventional
input via the rotary input selector knob or via the remote control.
When set to analogue 3, this input is allocated to the HT direct button and removed from
the sources available via the input selection knob.
4> CD INPUT SETUP
Options:
1. No CD
2. Analogue 1
3. Analogue 2
4. Analogue 3….Not available when allocated to HT Direct.
5. Coax 1
6. Coax 2
7. Coax 3
8. Optical 1
9. Optical 2
10. Optical 3
11. I2S
12. I2S
Explanation> The Libra Precision DAC can be used with an Antila CD player or any other
CD player with suitable digital outputs, as a two box CD solution. This menu defines which
digital input is to be used by the CD transport. This input will be automatically selected
when CD is selected for replay on the front panel.
15
Setup Menus, Basic Settings Cont’d
5> INPUT VOLUME DROP
Options:
1. Drop on Input Change
2: Leave on Change
Explanation> The Libra DAC can be set to automatically drop the volume to a low level
when changing sources. This ensures that when inadvertently changing input from a
source playing light classical to a source playing thrash metal, no damage can result.
This feature can be enabled or disabled here.
Please note, the No Drop mode should be used with caution.
6> SET LCD BRIGHTNESS
Explanation> The brightness of the display can be adjusted here for user preference.
The brightness will revert to a high level when navigating menus and revert to the user
selected level in normal operation.
When the unit is placed in standby, the display will dim to its minimum level and show the
Leema logo.
16
Setup Menus Advanced
1> SET LCD OFF TIMER
Options:
1.
2.
3.
4.
LCD ALWAYS ON
OFF IN 5 SECONDS
OFF IN 10 SECONDS
OFF IN 30 SECONDS
Explanation> The LCD display can be set to automatically turn off after a preset period of
time following a command such as changing input or adjusting the volume. The display will
reactivate upon such an action then turn off following the preset period defined in the
menu.
2>INPUT NAMES: All input names are fully editable.
Explanation > The rear panel is labeled Optical IN 1, IN 2, IN 3, etc. These are the default
names used by the firmware, however, the name may be changed as the user requires to
make it easier to identify an audio source.
For example, if a satellite receiver is connected to the optical input 1, this input could be
renamed to 'SAT'. Input name can be up to ten characters long.
EDITING AN INPUT NAME
Press the MENU button.
Using the input knob, locate item 2, "INPUT NAMES" and select by pressing select button.
Rotating the Input knob, locate the input name to be edited, again, press the select
button.
The display will now show:
EDIT :<input name>
ALIAS :<Original name>
Notice that the first letter of the input name is flashing as a block.
To change the letter, press select. The letter will now be underlined. Rotating the input
knob will scroll through the available letters and symbols. These are:# ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789\-+:,
When the required letter or symbol has been located, press the select button. This will
return the display to a flashing block. The Input knob can now be used to locate the next
letter to edit. Repeat the process until the name is displayed as required.
Finally, press the MENU button to exit the editor and once again to exit the MENU
unction. During the edit process, the original name (as used on the rear panel) is shown as
ALIAS for reference.
17
Setup Menus Advanced, Cont’d
3> EDIT I2S ONE INPUT PINS
I2S comprises four signals: SDATA, SCLK, LRCK and MCLK.
The pin assignment of these signals may be edited by using the menu select button and
input knob. Each signal may be set to any of the eight pins in the RJ45 connector.
Each signal must be set to a different pin and the editor will check for any duplicated pin
numbers after the user has finished editing.
The remaining four pins in the connector are used as signal grounds. It is not necessary
for the user to define these. After the user has defined the four signal pins, the system will
automatically define the remaining pins as grounds.
Explanation> The pin assignment of the I2S2 input can be freely defined here. This allows
any device equipped with an I2S output to be connected to the Leema Libra DAC, no matter what the connection pin configuration. Please see manufacturers documentation regarding pin configuration.
4 > LIPS Setup
Options:
1. OFF
2. PREAMP
3. DAC
Explanation> The Leema Libra DAC can be used within a Leema LIPS connected system:
a. As a conventional DAC only, or:
b. As a preamplifier with analogue volume control. This must be enabled via the
push switch on the rear panel.
Select the appropriate option for your system.
If LIPS is not required then simply select OFF.
PREAMP will enable LIPS data for remote volume control with a Leema power amplifier.
DAC will disable the internal volume control for use with an integrated amplifier.
OPTION 3 MUST ONLY BE SELECTED WITH EXTREME CAUTION AND WITH NO
AUDIO SOURCE RUNNING.
18
Setup Menus Advanced, Cont’d
5> SYSTEM RESET
Options:
1: CANCEL AND EXIT
2: LEAVE NAMES
3: FACTORY RESET
Explanation > Allows the system to be quickly reset to factory defaults.
Option 1 will not reset and will exit the reset sub menu.
Option 2 will reset all menu options but leave edited input names.
Option 3 will reset all menu options and reset input names to defaults.
19
LIPS
The following section is intended for installers, system integrators and third party
manufacturers.
What is LIPS?
LIPS or Leema Intelligent Protocol System, facilitates communication between various
items in a Leema audio system. It allows units such as the Elements Integrated and
Tucana II, to control other items in a chain. Leema’s 5.2 surround system is a good
example, where a Tucana II controls a Hydra II and Corvus. Key information including
volume level, input selection and power control is passed through the bus enabling other
units to operate in synchronisation. Intelligence is added within each receiving unit, for
example, a Hydra II installed as part of a surround system ‘knows’ that it won’t be required
when listening to a stereo source such as CD. Therefore, when the Hydra II ‘sees’ the CD
input selected, it powers itself down.
Each Leema unit can be controlled via the LIPS bus. Controlling an Elements Integrated
externally for example, enables it to be used within a home automation system.
LIPS Specifics
The LIPS bus is driven by an open-drain output. Leema can supply a full RS232 interface
if required. The communication standard follows the common RS232 format of No Parity,
8 data bits and 1 stop bit. The baud rate is 38400.
LIPS Packets
Each communication on the LIPS bus contains a packet of four data bytes as follows:
First a header is sent with a value of 255. This alerts the receivers to incoming data.
Next, a command header is sent. For a volume command, this would be 40.
Next, a value relating to the command is sent. For volume this would be 0 to 248.
Finally a tail byte is sent with a value of 0.
20
Infra-red codes.
For further information, please contact Leema Technical Support.
The following codes may be used to program universal remotes in Sony 12 bit protocol:
IR DEVICE = 20 (DAC)
IR Commands:
——————————————————————————————————————-The following are used for direct input selection
0 to 9 = Numeric buttons 1-10
32 = button 0
39 = 10+ button
——————————————————————————————————————-input assignment:
0 = OPTICAL 1, 1 = OPTICAL 2, 2 = OPTICAL 3
3 = COAX 1, 4 = COAX 2, 5 = COAX 3
6 = AES/EBU 1, 7 = AES/EBU 2
8 = USB
9 = BLUETOOTH
10 = ANALOGUE 1, 11 = ANALOGUE 2, 12 = ANALOGUE 3
——————————————————————————————————————-16 = INPUT UP, 17 = INPUT DOWN,
18 = VOLUME UP, 19 = VOLUME DOWN,
20 = MUTE (TOGGLE)
21 = POWER (TOGGLE),
42 = HOME THEATRE DIRECT
84 = DISPLAY (TOGGLE).
93 = ABSOLUTE PHASE (TOGGLE)
21
Specifications
Frequency Response, 20Hz to 20kHz +/- 0.25dB.
Distortion at 1kHz, better than 0.001%
Crosstalk at 20kHz, better than -95dB.
THD at 0dBFs, better than 0.005%
Jitter at 1kHz, less than 50ps.
Output levels, fixed gain mode, 0dB at 1kHz, unbalanced=2.1V rms, balanced = 4.2V rms
DAC: Quattro 24bit/192kHz with low jitter receiver. Leema USB-M1 24/192 Module.
Specifications subject to change without notice.
WEEE Scheme
Disposal of Electronic Equipment in the European Union and other countries with collection procedures:
The wheelie bin symbol on this product indicates that it shall not be treated as household
waste.
It should be disposed of via a collection point for the recycling of electrical and electronic
equipment. Leema is fully registered under WEEE/HK 0757 ZX
22
DIGITAL INTERFACE BOARD
INSTRUCTIONS
23
Index
Introduction ................................................................................................................................ 25
Environmental Issues .................................................................................................................. 25
WEEE Scheme ............................................................................................................................ 25
Made in the UK ............................................................................................................................ 25
Contact Us ................................................................................................................................... 25
Windows USB Driver ................................................................................................................... 26
Driver Installation ................................................................................................................... 27, 28
Finalising Driver Installation ......................................................................................................... 29
Using the USB interface ……………………………………………………………………………….. 29
.
SPDIF Interface ........................................................................................................................... 29
Cables ......................................................................................................................................... 29
Asynchronous USB …………………………………………………………………………………….. 30
Windows 8/8.1 additional installation details…………………………………………………………. 31
Bluetooth Module instructions & limited liability statement…………………………………………. 32
Declaration of Conformity ............................................................................................................ 33
24
Introduction
Leema’s state of the art M1 USB board allows for state of the art connection via USB.
For correct operation of the USB interface a suitable driver must be installed on the host
machine. This is supplied on a disc with the Libra DAC. Please follow the installation
instructions carefully.
Environmental Issues
Leema operates a 100% recycling program. All waste materials generated as part of the
manufacturing process at Leema’s headquarters are recycled via a licensed specialist
company.
Although Leema electronics operate in standby mode as opposed to being fully switched
off, the power drain has been optimised to a negligible level. Contrary to popular
audiophile practice, we do not recommend leaving our products permanently powered.
All Leema products have been designed to attain full operational specifications and sound
quality within a few minutes of switch-on.
WEEE Scheme
Disposal of Electronic Equipment in the European Union and other countries with
collection procedures:
The wheelie bin symbol on this product indicates that it shall not be treated as household
waste. It should be disposed of via a collection point for the recycling of electrical and
electronic equipment. Leema is fully registered under WEEE/HK 0757 ZX
Made in the UK
Leema electronics are entirely designed and manufactured in the UK. This includes all
metalwork and packaging.
Contact Us
Leema may be contacted via our website: www.leema-acoustics.com
or by telephone:- +44 (0)1938-559021
25
Windows® USB Driver
A driver is provided for use with the Microsoft Windows® operating system. The driver supports
all versions of Windows from XP to Win7 in 32 bit and 64 bit versions (with current service
packs). If the user has an option, Win7 is preferred. The driver must be installed if the Elements
Precision DAC is used with Windows, otherwise the unit will not be installed correctly by the operating system.
Apple OSX® and Linux® operating systems do not require an additional driver.
Driver Installation
The driver is supplied on CD.
Step 1. Ensure that the USB port on the rear of the Libra DAC is connected to a high speed
USB port on the computer. Note that the port must be high speed - the Libra USB digital interface cannot be used on a full speed port.
Step 2. Ensure that the Libra DAC is powered on.
Step 3. Insert the CD into the computer’s CD drive and navigate to the Leema USB Audio Driver
folder.
Step 4. Double click ‘setup.exe’ and follow the instructions on screen.
The following screen shots show a Windows 7 installation. Installation in other Windows
versions is similar.
26
Installation cont’d
THE INSTALLATION WELCOME SCREEN
CHOOSE A LOCATION FOR INSTALLATION
COMPLETING THE INSTALLATION
27
Installation cont’d
Note: In Windows XP, the sample rate cannot be changed in
“Properties”.
In this version of Windows, the sample rate can only be
selected from within the playback application being used.
To ensure Windows does not re-sample the audio, causing a
loss in quality, select a sample rate which matches that of the
audio material being played.
Using the ASIO driver will give the best audio quality playback
and is mandatory for DSD playback.
28
Finalising Driver Installation
In some versions of Windows, the machine must be re-booted after driver installation,
so this is recommended.
If the Leema USB-M1 is still not found, switch off the DAC and then switch back on. This
will cause the USB device to detach and re-attach. The operating system should then
recognize the DAC and configure the driver.
Using the USB interface
The USB interface can be used for playing audio from media players such as Windows
Media Player etc.
It may also be used to render audio playback from applications such as Spotify™ and
Napster™.
Note that the USB interface is a playback only device - It is not possible to record using
the USB connection.
To assemble recordings on the PC, it is better to RIP CDs or use downloads including
the high resolution offerings from companies such as HD Tracks.
The USB interface can be used with all sample rates from 32 kHz to 192 kHz at 16 or 24
bits.
S/PDIF Interface
The S/PDIF interface offers three optical inputs, which can operate at all of the standard
data rates between 32 kHz and 192 kHz at 16 or 24 bit. The three co-axial RCA (Cinch)
inputs may also be used with sample rates from 32 kHz to 192 kHz at 16 or 24 bits.
All sample rates are configured automatically.
Cables
Use a dedicated S/PDIF or video cable to connect an S/PDIF source. Using an audio
cable will degrade the data.
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Asynchronous USB
Leema Acoustics are one of only a select few manufacturers that can offer the very highest
quality audio playback via USB, using a system called Asynchronous playback.
In a conventional USB playback scenario, the computer varies the speed of the digital audio stream emanating from it’s USB port, itself. The DAC has no option but to slavishly follow this variable data rate. This is not a suitable method for producing high quality audio
since it results in high jitter which in turn results in high distortion.
Asynchronous USB playback requires the DAC to accurately regulate the data output
speed of the computer to practically eliminate jitter based distortion.
In practice this is a very complex task and requires the computer to have a free USB 2.0
port, connected to the DAC via a suitable high speed USB 2.0 cable.
The Leema Libra DAC is a USB high speed device which upon connection, invokes the
USB port’s high speed mode. This mode is only available under USB 2.0.
Windows does not natively support High data rate audio formats, hence the need for a
driver to be installed.
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Windows 8/8.1 installation
In Windows 8/8.1, the driver works under "Windows 7 compatibility mode".
These instructions assume that you are using the disc supplied with the Libra, if not, you can download it
from our website, www.leema-acoustics.com ...navigate to the Libra DAC, click the DOWNLOADS tab and
the USB driver is made available to download. However, If you are using the disc jump to step 9 below;
1. Navigate to the Leema website and select "downloads" from the Libra page.
2. Scroll to bottom and select USB driver for Windows systems v1.46.
3. Click on the disc icon then select "SAVE" when the download bar opens at the bottom.
4. When the download finishes, select "OPEN" which will automatically open the downloads folder under
file explorer for you, or close the bar and open the downloads folder yourself.
5. The downloaded files are compressed..............Windows8 knows this, so it automatically gives you the
option to extract them on the top menu bar. Select "EXTRACT" on the left, then "EXTRACT ALL" on the far
right.
A box opens asking where you would like the extracted files to be put. The default is downloads, which is
fine.
6. Tick the box that says "SHOW EXTRACTED FILES". Select "EXTRACT".
Another box opens under file navigator with a folder at the top called "ELEMENTS USB DRIVERS v1.46"
7. Double click on the folder to open it and a list of files are displayed.
8. Double click on the 14th file down, it says "SETUP" with the icon of a little computer and it says
"APPLICATION" under file types.
A warning box opens saying "Windows protected your PC"
9. Select "More Info" (written in purple, it's not obvious that you can select it). Select "RUN ANYWAY"
10. Another box opens, headed "User accounts control", asking if you want to make changes. Select "YES”
at the bottom.
11. Yet another box opens telling you that the operating system is not supported. Select "OK" at the
bottom.
12. Another box opens up asking if you would like to run in compatibility mode. Select "RUN IN COMPATABILITY MODE"
13. And another box opens under USER ACCOUNT CONTROL which asks "Do you want to allow the program to make changes to your computer".....select "YES".
The Leema install screen will now be shown......................make sure you have the DAC connected and
switched on. The driver will not install without the Libra connected via USB and switched on.
Follow the instructions........................
14. When the install is finished a warning box will open saying "Running this app could cause problems
with your computer"....select "Run Anyway".
A red T icon will briefly appear at the bottom right of the desktop page for a few seconds then it will be
automatically moved in to "show hidden icons" (an ^ at the bottom right in the system tray).
15. Now open the Charms Bar on the right of the screen and select "SETTINGS" at the bottom, then
"CONTROL PANEL" near the top.
16. Select "HARDWARE AND SOUND" then navigate to "SOUND".........."MANAGE AUDIO DEVICES".
17. Set the Leema USB1 module to be the default device.
18. Press "OK" or "APPLY" then shut all the boxes.
Select the USB input on the Elements DAC.
Open your music player................Such as Foobar or J River...select an appropriate track
Press "PLAY", the display on the DAC should report back the sample rate, ASYNC and FB< I > and you
should have music playing.
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Bluetooth Module Instructions
The Leema Libra DAC incorporates a high quality BlueTooth interface for easy connection
to most smart phones and tablets.
The module supports the latest high quality codecs including APTX and AAC.
The module will automatically negotiate the highest quality codec available from the
sending phone or tablet.
To pair a phone or tablet to the module, firstly, select the BlueTooth input on the Libra.
Wait 10 seconds for the Libra BlueTooth module to start broadcasting.
Then enable Bluetooth on the phone or tablet.
Ensure that the phone or tablet is scanning/searching for other BlueTooth devices.
When the Libra is found, the phone or tablet will display “LeemaLibra” followed by a
6 figure unique identity code.
To the right of the LeemaLibraxxxxxx is a small icon like a cog (Android 5).
Pressing this brings up a list of content that will be broadcast to the Libra.
Ensure that only the MEDIA check box is ticked., then press OK
Select “LeemaLibraxxxxxx” to pair the two devices.
The two devices should automatically connect and display
“LeemaLibraxxxxxx connected (no phone).
Now simply open your favourite audio player and play your music.
When you have finished listening, navigate back to the Bluetooth menu and turn off
BlueTooth.
To change the paired device, switch the Libra off, then on, select the BlueTooth input and
repeat the above procedure with the new phone/tablet.
The Libra BlueTooth module only broadcasts for connection when first turned on from
standby.
Liability limitation
Due to the large number of different BlueTooth devices provided by a multitude of different
manufacturers, Leema Acoustics ltd cannot be held responsible if a device is unable to
pair or function correctly with the Leema BlueTooth module.
32
33
Name: Nia Davies
Position: Managing Director
Done at: Leema Electro Acoustics Ltd.
On: 31/072015
Signed by: .................................................................................................................................................
I hereby declare that the equipment named above has been designed to comply with the relevant sections of the above referenced specifications.
The unit complies with all applicable Essential Requirements of the Directives and Standards.
BS EN60065; 2002 Electrical Safety Requirements EN60065; 2002 / IEC60065; 2001
BS EN 55020; 2002 EMC Immunity EN55020; 2002 / CISPR 20; 2002
BS EN 55013; 2001 EMC Emissions EN55013; 2001 / CISPR 12; 2001
BS EN 61000-3-2; 2001 EMC Limits for Harmonic Emissions EN61000-3-2; 2000 / IEC61000-3-2; 2000
BS EN 61000-3-3; 1995 EMC Limits for Voltage Fluctuations EN61000-3-3; 1995 / IEC61000-3-3; 1994
Standard. No. Name International Equivalents
is in conformity with the applicable requirements of the following standards
hereby declare that: Equipment: Digital Audio Interface Model Name: USB - M1
in accordance with the following Directive(s): 2006/95/EC The Low Voltage Directive 2004/108/EC The Electromagnetic Compatibility Directive
of Severn Farm Industrial Estate
Welshpool
Powys
UK
We Leema Electro Acoustics Limited
EC Declaration of Conformity
In accordance with EN ISO 17070-1:2004
NOTES
34
NOTES
35
Leema Electro Acoustics Limited
16, Severn farm industrial estate, Welshpool, Montgomeryshire, Wales, UK, SY21 7DF
email: [email protected]
Web: www.leema-acoustics.com
36
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