LMS-D24 / LMS-D26
DIGITAL LOUDSPEAKER
MANAGEMENT SYSTEM
USER MANUAL
Turbosound Ltd.
Star Road, Partridge Green
West Sussex RH13 8RY England
Tel: +44 (0)1403 711447 Fax: +44 (0)1403 710155
web: www.turbosound.com
Version 1.0 ©Turbosound 4/05
user manual
LMS-D24/26
LMS-D2X user manual
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QUICK REFERENCE
(LMS-D26 shown)
Display
The LCD displays preset and parameter informat ion. At start up the display shows t he default
screen with the memory location and name of the curr ent preset on the lower line of text .
Channel Select Buttons
The currently selected input or output channel is shown in the top left corner of the display.
Pressing the channel select buttons scroll s through the available inputs and outputs. If operating
stereo linked the channel name will indicate the channel association. For example ‘CH A+B’ means
both input A and B parameters.
Edit Select Buttons
The name of the edit parameter is displayed in the bott om left portion of the LCD. Pressing the edi t
select buttons moves through the available para meters for the current input or output .
Parameter Encoders
Up to three parameters are shown on the display. The parameter name is shown with its’ current
value below. Where appropriate parameter s are grouped according to function for example cent re
frequency, width and gain for parametr ic EQ. Turn an encoder clockwise to incr ease the value of a
parameter, or anti-clockwise to decrease it. Turning a knob rapidly will cause the action to
‘accelerate’, so the va lue changes more ra pidly.
Mute Buttons
The LED’s next to the mute buttons indicate t heir current status. Pressing a mute but ton toggles
between the mute on and off.
Store Button
The unit has 45 memory locations and allows users to set up their own programs. To store a
preset in a location, press the store butt on and use the encoders to select the memory location and
name the preset. Pressing the store button agai n completes the task. Pressing any button other
than store during the process cancels the procedure.
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LMS-D24/26
LMS-D2X user manual
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CONTENTS
Quick reference ........................................................................................................................................................ 2
Display .................................................................................................................................................................. 2
Channel Sele ct Buttons ...................................................................................................................................... 2
Edit Select Butto ns .............................................................................................................................................. 2
Parameter Encode rs............................................................................................................................................ 2
Mute Buttons ....................................................................................................................................................... 2
Store Button ......................................................................................................................................................... 2
Important Safety Information ................................................................................................................................. 5
Regulatory C ompliance ...................................................................................................................................... 5
Thanks .................................................................................................................................................................. 6
Unpacking the c ontroller .................................................................................................................................... 6
Introduction.......................................................................................................................................................... 7
Features ................................................................................................................................................................ 7
The User Guide ........................................................................................................................................................ 8
Front Panel Fu nctions ......................................................................................................................................... 9
Rear Panel Fu nctions ........................................................................................................................................ 11
Operating the LM S series controlle r.................................................................................................................... 12
Starting up ......................................................................................................................................................... 12
Selecting a Fac tory Preset ................................................................................................................................ 12
Creating a Cro ssover ........................................................................................................................................ 12
Navigation and V iewing Paramete rs .............................................................................................................. 13
Navigation .......................................................................................................................................................... 14
Presets ................................................................................................................................................................ 15
Preset Recall ....................................................................................................................................................... 15
Preset Store ........................................................................................................................................................ 16
DSP Process ing Layout ......................................................................................................................................... 17
Input DSP block diagram........................................................................................................ .......................... 17
Output DSP blo ck diagram ............................................................................................................................... 17
Stereo / Mono Formats ..................................................................................................................................... 1 7
DSP process ing ...................................................................................................................................................... 18
Input Channels................................................................................................................................................... 18
Parametric Equalisation.................................................................................................................................... 20
High and Low s helving filters .......................................................................................................................... 20
Parametric filters ............................................................................................................................................... 20
Output Chann els ....................................................................................................................................................21
Gain and Polarity ............................................................................................................................................... 21
Delay ................................................................................................................................................................... 21
High and Low P ass Filters ................................................................................................................................2 2
user manual
LMS-D24/26
LMS-D2X user manual
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Parametric Equalisation ................................................................................................................................... 23
Limiters............................................................................................................................................................... 24
Routing ............................................................................................................................................................... 24
Utilities .................................................................................................................................................................... 25
Utility functions ................................................................................................................................................. 2 5
Factory Presets ....................................................................................................................................................... 26
EQ and Filter Response Graphs ........................................................................................................................... 27
Technical Spe cifications ................................................................................................................................... 30
Warranty ................................................................................................................................................................. 31
NOTES ................................................................................................................................................................ 32
user manual
LMS-D24/26
LMS-D2X user manual
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IMPORTANT SAFETY INFORMATION
Please read carefu lly and keep the fo llowing instructions a nd safety information. H eed all warnings
and follow all instructio ns.
• Do not remove covers. There are no user serviceable parts inside, please refer servici ng
to qualified service personnel.
• This equipment must be earthed.
• Protect the power cord from being wal ked on or pinched particularly at pl ugs,
convenience receptacles, and the point where they exit f rom the apparatus.
• Only use attachments/accessories specified by the manufacturer.
• Servicing is required when the apparatus has been damaged i n any way, such as the
power supply cord or plug is damaged, liquid has been spilled or objects have fallen into
he apparatus, the apparatus has been exposed to rain or moistur e, does not operate
normally, or has been dropped.
Regulatory Compliance
This product complies with both the EMC Di rective (89/336/EEC) and the Low Vol tage Directive
(73/23/EEC) as issued by the Commission of the European Communi ty.
Compliance with these directives im ply conformity with the foll owing European standards:
• EN60065 Product safety
• EN55103-1 Electromagnetic Interference (Emission)
• EN55103-2 Electromagnetic Susceptibility (Immunity)
This product is intended for operati on in the E2 (commercial & light industrial) and E3 (urban
outdoors) Electromagnetic Environments.
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Thanks
Thank you for choosing a TURBOSOUND LMS series controller for your application. Please spare a
little time to read the content s of this manual, so that you obtain t he best possible performance
from this unit.
All TURBOSOUND products are carefully engineered for world class performance and reliability.
If you would like further information about this or any other TURBOSOUND product, please
contact us.
We look forward to helping you in the near f uture.
Unpacking the controller
After unpacking the unit please check carefull y for damage. If damage is found, please not ify the
carrier concerned at once. You, the consignee, must instigat e any claim. Please retain all
packaging in case of future re-shipment.
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LMS-D24/26
LMS-D2X user manual
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Introduction
The Turbosound LMS series of loudspeaker management systems represents the cur rent state-of-
the-art in digital elect ronics. The LMS-D24/26 are compact and powerful DSP based audio-
processing units designed for use with Turbosound l oudspeaker systems and associated bass
enclosures, combining the functions of mul tiple conventional products in a compact 1U high 19”
rack unit. To achieve this the LMS-D26 has 2 input s and 6 outputs (the LMS-D24 features four
outputs), which are configured by dif ferent factory presets to allow use with a variety of systems.
The units are designed to provide specific equal isation and crossover points aimed at opti mising
the performance of these Turbosound loudspeaker systems. In addi tion, limiters, del ays eq, gain,
polarity, and crossover filter controls are accessible to the user in order t o match specific operation
environments. The LMS series crossovers are designed for quick setup and adj ustment via easy-to-
use front panel controls.
Features
• Minimal signal path design, providi ng exceptional audio quality wit h carefully optimised
processing and high performance converters for a full >111dB dynamic range, 96kHz
sampling rate and minimal filt ering. Audio-grade capacitors are used i n the analogue signal
path.
• Sonically superb ADC / DAC combination; a caref ully matched pairing of the best devi ces
from Burr Brown and Wolfson.
• Newly released family of Analogue Devices SHARC DSP.
• Extended bandwidth; 96kHz sampling frequency provides f or a nominally flat response to
40kHz.
• Front panel paramete r rotary encoder prov ides a familiar and easy to use control format
with all filter inf ormation displayed simultaneously on a backlit LCD display.
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LMS-D2X user manual
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THE USER GUIDE
This user manual gives a progressively more detail ed description of the functions of t he
TURBOSOUND LMS-D26 and LMS-D24 loudspeaker management systems. A single page quick
reference guide is provided for those users w ho are experienced with this type of equi pment and
just need to know how to ‘drive’ the front panel.
A detailed explanation of the fr ont and rear panel controls and indicator s is contained in the next
section. The final section describes each i ndividual function or feature w ith annotated images
explaining its use. Where appropriat e, the LCD is shown to further elabor ate on the unit’s
operation.
To complete the manual a reference section is incl uded, describing the technical performance of
the device complete with graphs of fi lter responses and details of the
Factory Presets
and their
configuration.
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LMS-D2X user manual
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Front Panel Functions
2x 24 chara cter
LCD
Input Sign al
Indicato rs
Store and
Recall butto ns
Channel Select
buttons
Parameter Edit
Encoders
Output Mute
buttons
Limiter
Indicators
Edit Param eter
Select buttons
• Input Signal Indicators – A set of three pairs of LED’s indicate si gnal present, +4dBu and
input clip for both channels. The si gnal present LED’s operate at approximatel y –40 dBu,
giving a useful indication of even r elatively low input signal levels. The +4 dBu LED’s are
intended to show nominal operating level and can also be usef ul for setting system gain
structure. Clip LED’s warn the user of input overload and operate at +19 dBu.
• Program Store and Recall – these controls provide access to 45 preset s. Pressing the
store button allows the user to name a preset and choose which memory location it will
be held in. Pressing store button again complet es the process. The Recall function
operates in a similar way , pressing the reca ll button allows the us er to select which pre set
they require, pressing the button for a second time, then confirming, recal ls the new DSP
settings. The unit allows the user t o set up user programs with full access to all
parameters.
Note that presets cannot be stored or recal l ed w hen secur e mode i s act i vated.
• Channel Selection Buttons – the currently sel ected channel is displayed on the top left
hand corner of the LCD. Pressing the channel buttons scr olls through the available input
and output channels and finally through the utility functions and back to the default
screen. If operating a stereo-linked pr eset the channel n ame will indicate the ch annel
pairing. For example ‘A+B’ means both input A and B parameters. The name of the output
will be shown briefly a t the top of the disp lay when steppin g onto an outpu t.
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• Edit Select Buttons – the currently select ed edit parameter is displayed on the bottom left
corner of the LCD. Pressing the edit select buttons moves through the available
parameters for the current input or output.
• Text display – preset, channel, parameter and status information is shown on the 2x 24-
character text display. In most screens the currently select ed channel is displayed on the
upper line and the edit parameter on the low er line. To simplify the displ ay and enhance
security, some parameters or parameter pages are omitted when not relevant.
• Parameter Knobs – three velocity sensitive par ameter knobs are used to adjust
parameters shown on the display. Up to three parameters are displayed on t he screen.
The parameter name is shown above the parameter value in each of t he three screen
sections. The parameter knobs have a fixed association w ith the screen sections; the
rightmost parameter knob adjusts the right most parameter and so on.
• Output signal and limiter indication – two LED’s are provided f or each output channel.
These show the signal level relative to the limiter threshold. The yellow LED will light
when the signal is 6 dB below the thresh old and the red warn ing LED will light when the
limiter threshold is reach ed.
• Mute buttons and status LED’s – each output has a mute butt on and associated mute
status LED. Pressing the button toggles t he mute on and off.
•
Note that the mute buttons do not funct i on when the Secure Mode is activated.
• Secure Button (on the rear) – a momentary butt on is fitted behind the rear panel,
between the output XLRs and the RS232 port. When activated, this will disable all the
front panel controls so they cannot affect the signal path, making the unit secure agai nst
tampering. When in s ecure mode, the indic ators still operate norma lly.
Note that the commun ications port is still activ e in secure mode.