LMS-D4
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.turb osound.com
user manual
LMS-D4
CONTENTS
Important Safety Information............................................................................................................3
Unpacking the LMS-D4......................................................................................................................4
Introduction ........................................................................................................................................5
Features ............................................................................................................................................. 5
Front Panel Functions ........................................................................................................................6
Rear Panel Functions.......................................................................................................................... 7
Output Configurations .......................................................................................................................8
Operating the LMS-D4 .......................................................................................................................9
Crossover Settings...........................................................................................................................11
Specifications...................................................................................................................................15
Warranty...........................................................................................................................................16
Appendix A.......................................................................................................................................17
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An example of this equipment has been t ested and found to comply with the
following European and international Standards for Electromagnetic
Compatibility and Electrical Safety:
Conducted and Absorbed Emissions (EU): EN55103 (1996)
Harmonic Current Emisi ons (EU): EN61000-3-2
Voltage Fluctuations/Flicker (EU): EN61000-3-3
Generic Immunity (EU): EN50082-1 (1997)
Electrical Safety (EU): EN60065 (1998)
Electrical Safety (US): UL6500 (2000)
Electrical Safety (Canada): CSA E6500 (1999)
Important Safety Information
Please read carefully and keep the following instructions and safety information.
Heed all warnings and follow all instructions.
user manual
LMS-D4
• Do not remove covers. There are no user serviceable parts inside, please refer
servicing to qualifi ed service personnel. This equipment must be earthed.
• Protect the power cord from being walked on or pinched parti cularly at plugs,
convenience receptacles, and the point where they exit from the apparatus.
• Only use attachments/accessori es specified by the manufacturer.
• Servicing is required when t he apparatus has been damaged in any way, such as
the power supply cord or plug is damaged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been exposed to rain or moisture,
does not operate normally, or has been dropped.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
DO NOT EXPOSE TO RAIN OR MOISTURE
ATTENTION
RISQUE DE CHOC ELECTRIQUE
NE PAS ENLEVER
NE PAS EXPOSER A LA PLUIE NI A L’HUMIDITE
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user manual
LMS-D4
Thanks
Thank you for choosing the TURBOSOUND LMS-D4 for your application. Please spare a little time
to study the contents of th is manual, so that you obtain t h e 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, pl ease
contact us.
We look forward to helping you in the near future.
Unpacking the LMS-D4
After unpacking the unit please check carefully for damage. If damage is found, please notify the
carrier concerned at once. You, the consignee, must instigate any claim. Please retain all
packaging in case of future re-shipment.
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Introduction
The LMS-D4 is a compact and powerful DSP based audio-processing unit designed for use with
particular Turbosound loudspeaker systems and associated bass enclosures, com bining the
functions of multi ple conventional products in a compact 1U high 19” rack unit. To achieve thi s the
LMS-D4 has 2 inputs and 4 outputs, which are configured by differ ent system presets to allow two
basic modes: stereo 2 way and mono 3 way. The unit is designed to provide specific equalisation
and crossover points aimed at opt imising the perform ance of these Turbosound loudspeaker
systems. In addition, limiters, delays (up to the equivalent of 14 metres), gain, polar ity, and bass
trim controls are accessible to the user in order to match specific operation environments. The
LMS-D4 is designed for quick set up and adjustment via easy-to-use front panel controls.
Features
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LMS-D4
• The LMS-D4 provides e x
performance converters f o r a full >108dB dynamic range, hi gh sampling rate and minimal
filtering. Audio-grade capacitor s are used in the analogue signal path.
• Bass boost filt er
Bass boost fil ter, allowing an easy adjustment of the response to match variations in acoustic
Bass boost filterBass boost filter
environment such as half space operat ion (for floor monitor use), coupling of cabinets in
arrays, or room resonances.
• Front panel rot ary encoder
Front panel rotary encoder providing a familiar and easy to use control format with all filter
Front panel rotary encoderFront panel rotary encoder
information displ ayed simultaneously on a backlit LCD di splay.
• Delay of up to 42mS
Delay of up to 42mS can be set for each output (mono) or each pair of outputs (stereo) .
Delay of up to 42mSDelay of up to 42mS
exceptional audio quali t y
ceptional audio quality with carefully optimised processing and high
exex
ceptional audio qualityceptional audio quality
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LMS-D4
Front Panel Functions
3 286
LMS-D4
DIGITAL LOU D SPEAKER MANA GEMENT SYST EM
14 5 7 9 10
1. LCD Display
LCD Display - Shows menu options, output information and the parameters being adjusted.
LCD DisplayLCD Display
2. Menu Key
Menu Key - Activates the main menu on the LCD display, and toggles between menu options
Menu KeyMenu Key
and system name display. Different menus are selected by pressing the
< BACK NEXT >
MENU ENTER
SCROLL A B
CLIP
-24
1234
LIMIT
MUTE
‘BACK’
‘BACK’
‘BACK’‘BACK’
RS-232
and
‘NEXT’
‘NEXT’
‘NEXT’‘NEXT’
keys.
3. Next Key
Next Key - Moves forwards through the list of available menus or options
Next KeyNext Key
4. Back Key
Back Key - Moves backwards thr ough the list of available m enus or options.
Back KeyBack Key
5. Enter Key
Enter Key - Enters the chosen menu and confir m s menu selections.
Enter Key Enter Key
6. Scroll knob
Scroll knob - The rotary encoder allows the current parameter displayed on the LCD screen to
Scroll knobScroll knob
be adjusted, and scrolls through the available list of presets.
7. Input LED’s
Input LED’s - The bottom green LED indicates when the input signal is at -24dBu, whereas the
Input LED’sInput LED’s
top red LED indicates overload of the analogue to digital converter.
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8. Limiters LED’s
Limi ters LED’s – Indicates when limiting occurs on a particular output channel. The red LED is
Limiters LED’s Limiters LED’s
set at the limiter threshold for that channel, provided limiter and gain settings are correct.
9. Mute Key
Mute Key – This mute key is active on all four output channels simultaneously. The red LED is
Mute Key Mute Key
illuminuted when the channels are muted.
10. RS232 input
RS232 input – The 9-pin socket allows communication with a PC via a serial COM port and a
RS232 inputRS232 input
standard RS232 cable.
Rear Panel Functions
user manual
LMS-D4
1
STAR ROAD, PARTRIDGE GREEN, WEST SUSSEX, RH13 8RY
THIS APPARATUS MUST BE EARTHED.
DO NOT EXPOSE THIS UNIT TO MOISTURE.
DO NOT REMOVE THIS COVER.
NO USER SERVICEABLE PAR TS INSIDE.
REPLACE FUSE WITH SAME TYPE ONLY.
MADE INTHE E.U.
LMS-D4
SERIAL NO.:
POWER
~ 50/60Hz 100V-240V
Fuse Sticker
OUTPUT 4 OUTPUT 3 OUTPUT 2 RIGHT / MONO IN LEFT INOUTPUT 1
24 3
1. Mains Power
Mains Power - Connected via a standard IEC socket. A compatible power cord is supplied
Mains PowerMains Power
with the unit.
2. Mai ns Fuse
Mains Fuse - Located in a finger-proof fuseholder integral to the mains inlet. Always r eplace
Mains FuseMain s Fuse
this fuse with the correct type as shown on the rear panel legend. (N.B. A spare fuse is
located in this holder.)
3. Audio I nputs
Audio Inputs - 3 pin female XLR connectors are provided for each audio input. All
Audio InputsAudio Inputs
terminations are el ectronically balanced, pin 2 Hot, pin 3 Cold and pin 1 Screen (shiel d). The
input sensitivity i s pre-set at 0db. The overall default gain of the unit is set at -14dB. Please
note that when the unit is operated in mono 3-way mode, the input signal is to be fed into t he
RIGHT / MONO connector.
4. Audio Out puts
Audio Outputs - 3 pin male XLR connectors are provided for each audio output. All
Audio OutputsAudio Outputs
terminations are el ectronically balanced, pin 2 Hot, pin 3 Cold and pin 1 Screen (shiel d).
Please note that connecting to unbalanced amplifier inputs should be avoided as it will result
in a 6 dB loss of level, and limiters settings will be out by 6 dB.
PIN1=SHIELD
PIN2=HOT
PIN3=COLD
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LMS-D4
System
System O/P 1
SystemSystem
TQ
TQ----308 Passive
308 Passive - Left - Right
TQTQ
308 Passive308 Passive
TQ
TQ----308 Pas + Sub
308 Pas + Sub Left Sub Left Main Right Sub Left Main
TQTQ
308 Pas + Sub308 Pas + Sub
TQ
TQ----310 Passive
310 Passive - Left - Right
TQTQ
310 Passive310 Passive
TQ
TQ----310 Pas + Sub
310 Pas + Sub Left Sub Left Main Right Sub Left Main
TQTQ
310 Pas + Sub310 Pas + Sub
TQ
TQ----310 Pas. Monitor
310 Pas. Monitor - Left - Right
TQTQ
310 Pas. Monitor310 Pas. Monitor
TQ
TQ----315 Passive
315 Passive - Left - Right
TQTQ
315 Passive315 Passive
TQ
TQ----315 Pas + Sub
315 Pas + Sub Left Sub Left Main Right Sub Left Main
TQTQ
315 Pas + Sub315 Pas + Sub
TQ
TQ----315 Pas. Monitor
315 Pas. Monitor - Left - Right
TQTQ
315 Pas. Monitor315 Pas. Monitor
TQ
TQ----315 Biamp
315 Biamp Left LF Left HF Right LF Right HF
TQTQ
315 Biamp315 Biamp
TQ
TQ----315 Biamp + Sub
315 Biamp + Sub - Sub Low High
TQTQ
315 Biamp + Sub315 Biamp + Sub
TQ
TQ----315 Biamp Mon.
315 Biamp Mon. Left LF Left HF Right LF Right HF
TQTQ
315 Biamp Mon.315 Biamp Mon.
Outputs are configured as fol lows:
Outputs are configured as fol lows:----
Outputs are configured as fol lows:Outputs are configured as fol lows:
O/P 1 O/P 2
O/P 1O/P 1
O/P 2 O/P 3
O/P 2O/P 2
O/P 3 O/P 4
O/P 3O/P 3
O/P 4
O/P 4O/P 4
TQ
TQ----440
440 Left LF Left HF Right LF Right HF
TQTQ
440440
TQ
TQ----440 + TQ
440 + TQ----425
TQTQ
440 + TQ440 + TQ
TFM
TFM----420
420 Left LF Left HF Right LF Right HF
TFMTFM
420420
TFM
TFM----450
450 Left LF Left HF Right LF Right HF
TFMTFM
450450
THL
THL----2222 Left LF Left HF Right LF Right HF
THLTHL
THL
THL----2 + THL
2 + THL----828
THLTHL
2 + THL2 + THL
THL
THL----811 + THL
811 + THL----828
THLTHL
811 + THL811 + THL
TQ
TQ----200 Series
200 Series Left Sub Left Main Right Sub Right Main
TQTQ
200 Series200 Series
TCS Series
TCS Series Left Sub Left Main Right Sub Right Main
TCS SeriesTCS Series
TXD Series
TXD Series Left Sub Left Main Right Sub Right Main
TXD SeriesTXD Series
Mono Flat
Mono Flat Ch A Ch B Ch C Ch D
Mono FlatMono Flat
Stereo Flat
Stereo Flat Ch A Left Ch B Left Ch A Right Ch B Right
Stereo FlatStereo Fl at
425 - Sub Low High
425425
828 - Sub Low High
828828
828 Left Sub Left Main Right Sub Right Main
828828
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Operating the LMS-D4
With the unit mount ed in a rack or cabinet, securely plug in all connections and check especially
that the Low (LF or Bass) and High (HF or Top) outputs are connected to the correct amplifiers. It is
good practice to switch on the LM S-D4 before powering up the ampli fiers.
When you plug the LMS-D4 into the mains power supply, the unit will power up and the LCD
display indicates the last system loaded; the unit will be configured as it was when it was last
turned off. The curr ent software version is also displayed for 10 seconds at star t-up. The red Mute
LED will also be illuminated, as the unit powers up by default with all outputs muted.
Menu Structure
user manual
LMS-D4
The structure includes t hree sub-menus: Load a Xover
is described in the next paragraphs. To access menus, press the ‘
and
‘NEXT’
‘NEXT’
‘NEXT’ ‘NEXT’
to navigate. Finally press
Load a Xover, Xover Setup
Load a XoverLoad a Xover
‘ENTER’
‘ENTER’
‘ENTER’‘ENTER’
when the desired sub-menu appears on the di splay.
Xover Setup and Utilities
Xover SetupXover Setup
Utilities. Their operation
UtilitiesUtilities
MENU’
MENU’
key and then use
MENU’MENU’
‘BACK’
‘BACK’
‘BACK’ ‘BACK’
System Selection
This menu allows the selection of a particular loudspeaker system and configures the LMS-D4
accordingly. It sets equalisation, crossovers, and other parameters to optimal default values and
the factory presets.
‘SCROLL’
To display and go through the available systems, use the
names will appear on the bottom line of the display. Once the desired configuration appears,
‘ENTER’.
confirm the selecti on by pressing
automatically muted; this is to limi t accidental change that could endanger the loudspeaker
components. A f ter a s ys t e m
setting is ‘
setting is ‘
setting is ‘setting is ‘
. After a system i s loaded t he
. After a system . After a system
OFF
OFF’’’’
....
OFFOFF
‘ENTER’.
‘ENTER’. ‘ENTER’.
is loaded the limiter settings must be adjusted
is loaded theis loaded the
Please note that this will cause the outputs to be
limiter settings must be adjusted since the default
limiter settings must be adjusted limiter settings must be adjusted
‘SCROLL’
‘SCROLL’‘SCROLL’
rotary encoder. The system
since the default
since the default since the default
Xover Setup
This menu allows you to change the sett ings of a number of parameter s, also refered to as “user
controls”. They are detailed in the next section....
Having entered the ‘Xover Setup’ menu, the information displayed will generally include three
fields:
1) The top row:- the output channel(s) being refered to.
2) At the left hand side of the bottom row:- the name of the parameter being edited.
3) At the right hand side of the bottom row:- the value of the parameter.
As an exception when the control is not channel related, its description will appear on the top row
(e.g. for Bass Boost).
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LMS-D4
Use the
desired control appears on the display, use the the
displayed on the bottom row.
IMPORTANT: Check that the li miter and amplifi er settings are correct and that mixer levels are
minimised before unmuting the LMS-D4.
‘NEXT’
‘NEXT’
‘NEXT’‘NEXT’
and
‘‘‘‘
BACK’ keys to navigate through t he accessible user controls. Then when t he
‘SCROLL’
‘SCROLL’
‘SCROLL’‘SCROLL’
button to change the value as
Utilities
This menu gives access to three features as indicated below:-
Lock/unlock
Lock/unlock
Lock/unlockLock/unlock
Locking the unit will prevent any change of the system in use as well as editi ng any of the user
controls.
To lock the unit, a password of 3 digits has to be entered. Use the ‘NEXT’ and ‘BACK’ keys to
move from one digit to the other, and the ‘SCROLL’ button to edit each of the three values. Finally
press the ENTER’ key. To unlock the unit, simply follow the same procedure.
Clear User Setups
Clear User Setups
Clear User SetupsClear User Setups
This sttttores the factory preset (default) values for the system currently selected. As a resul t any
change previously made to the user controls values will be cancelled.
Download from PC
Download from PC
Download from PCDownload from PC
A standard 9 pin RS-232 type connector is provided to facilitate the future implementation of
software downloads and future upgrades. To download new flash memory data this option must
be enabled.
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CROSSOVER SETTINGS
1) Input Gain
INPUT GAIN
Gain = 0.0dB
The input gain sets the attenuation of the signal befor e any processing is applied. The value
ranges from -40dB to +6dB in 0.5dB steps. In stereo mode the gai n value applies to both inputs.
2) LF Bass Boost
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LMS-D4
BASS BOOST
Trim = 0.0dB
Where implemented, the range of values are from +6.0 dB to –6.0 dB, in 0.5 dB steps. The corner
frequency is fixed and optim ised for each system, and typical ly it is around 100Hz.
The Bass Boost control allows for an easy adjustment of the response to match variations in the
acoustic environment. Generally the 0 dB setting will provide an optimally flat response for a
single cabinet in free space.
When the cabinet is used in dir ect proximity of a reflecting surface (i .e. half-space conditions), the
LF level should be reduced to maintain the same balance (in theory by 3dB). Similarly when a
number of cabinets are closel y coupled (e.g. in arrays) the LF control should be used to reduce the
level in the bottom end.
This control can also be used to create subjectively desired changes t o the tonal balance. Please
remember to use it with care, as excessive boost could mean more stress for the dri ve units and
make it more critical to have the limiters accurately set.
Bass boost is not implemented i n settings for speaker systems with subwoofers.
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3) Sub-bass channels operation mode
OP1+3 Sub
Mode = Stereo
The possible values are ‘Stereo’ and ‘MonoSum L+R’. With a syst em using a stereo two way
configuration and having channels 1 and 3 dedi cated for sub-bass operation, it is possible to set
these channels either as independent (i.e. in stereo mode) or with the signals fr om both Left and
Right inputs summed. Note: this screen is not available on monitor programs or bi-amp with sub
programs.
4) Peak Limiters
OP1+3 Sub
Limiter = +5dBu
Each output has an independent high performance limiter, with both attack and release times fixed
and optimally preset accor ding to the frequency range of the channel it operates on. The values
(displayed in dBu), refer to signal level at the outputs of the unit.
Follow these steps in order t o corr ect ly set li mi ter s f or your speaker syst em:
Follow these steps in order to cor r ectl y set l i mi ter s fo r your speaker system:
Follow these steps in order to cor r ectl y set l i mi ter s fo r your speaker system:Follow these steps in order t o corr ect ly set li mi ter s f or your speaker syst em:
1. Determine the program
as appropriate), or from the engineering data sheet or user manual for that product, or
from the label on the rear of the cabinet.
power handling of the Turbosound loudspeaker (or HF/LF section
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2. Calculate the required limiter voltage usi ng the formula:
V =
V = √√√√PR
PR
V = V =
PRPR
where V is the limit er voltage setting,
and P is the program power rating of the loudspeaker,
and R is the nominal impedance of the loudspeaker
3. Scroll to set the near est lower voltage to the calculated value in the limiter screen for that
loudspeaker model (or fr equency band as appropriate), and press ENTER. Refer to the
limiter voltage lookup table in Appendix A for a r ange of approximate conversion values.
In addition to those values, the limiters can also be defeated (OFF displayed on the screen). Please
note that this setting should be used only if the amplifiers already have internal limiters or soft
clipping circuitr y.
5) Channel Gain
OP1+3 Sub
Gain = 4.0 dB
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LMS-D4
Set the gain of the specified output channel relati ve to the other channel(s). Available values are
from +6.0 to –19.4 dB, in 0.2 dB steps. Note: with limiters and amplifier gain set correctly, 0dB
relative gain will give maximum output.
6) Polarity
OP1+3 Sub
Polarity = Normal
Define the polarity of the specified output channel. The value can be normal or inverted.
7) Delay
OP1+3 Sub
Delay = 0.000 ms
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LMS-D4
Set the signal delay on the specified output channel. The delays can be adjusted in 20.83 uS
increments, with a maximum value of 20.7 ms (≡ 7.1 metres) in stereo two way configurations, and
42 ms (≡ 14.4 metres) in mono three way configurations. These delays are provided (thei r range is
large enough) to align the driver components in the time domain – including separate sub-bass
cabinets – but will not replace a dedicated delay line unit in applications such as distributed
systems.
Please also note that, as with other similar di gital processing units, the values displayed are
and do not take into account the basic processing delay of the unit which is approximately
relative
0.4ms.
When adjusting the delay on bi- amped loudspeakers it is impor tant to ensure the diff erence
between channels remains fixed so that the HF and LF drivers stay aligned.
8) Store Setup
Store Setup
The settings of this particular setup can be saved so that when it is next recalled, th e user edited
value will return to their preferred settings.
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LMS-D4
Specifications
Inputs
Inputs Two electronically balanced nominally 0db
InputsInputs
Impedance
Impedance 10 kOhm
ImpedanceImpedance
Outputs
Outputs Four electronically balanced nominally 0db
OutputsOutputs
Min. Load
Min. Lo a d 600 Ohm
Min. LoadMin. Load
Max. Level
Max. Level +19dBu into 2kOhm load
Max. LevelMax. Level
Frequency Resp
Frequency Resp. ±0.5dB 20Hz - 20kHz
Frequency RespFrequency Resp
Dynamic Range
Dynamic Range 110dB (typ.) 20Hz -20kHz unweighted
Dynamic RangeDynamic Range
Distortion
Distortion < 0.02% @ 1kHz, +18dBu
DistortionDistortion
Maximum Delay
Maximum Delay up to 42 ms (increment 21 µs)
Maximum DelayMaximum Delay
Output gain
Output gain adjustable -15dB to +15dB in 0.5dB steps and mute
Output gainOutput gain
Bass Boost
Bass Boost shelf adjustable ±6dB in 0.5dB steps
Bass BoostBass Boost
Limiters
Limi ters threshold adjustable over an equivalent voltage range of 30 dB range, in 0.5dB steps
LimitersLimiters
Display
Display 2 x 20 character backlit LCD
DisplayDisplay
Input LED
Input LED Two per input, signal at -24dBu and digital clip
Input LEDInput LED
Limiters LED
Limiters LED One per output
Limiters LEDLim it er s LED
Connectors
Connectors
ConnectorsConnectors
Inputs 3 pin femal e XLR
Outputs 3 pin male XLR
Mains 3 pin IEC
Power
Power 100 to 240V ±10% @ 50/60Hz
PowerPower
Consumpt
Consumption
ConsumptConsumpt
Weight
Weight 2.3 kg net (3.5 kg shipping)
WeightWeight
Size
Size 1.75”(1U) x 19” x 6.4” (44mm x 482mm x 162 m m) excluding connectors
SizeSi z e
ion 6.5 watts.
ionion
Due to continuing product improvement the above specifications are subject to change.
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LMS-D4
WARRANTY
This product is warranted against defects in components and workmanship only, for a period of
one year from the date of shipment to the end user. During t he warranty period, TURBOSOUND
will, at its discretion, either repair or replace products which prove to be defective, provided that
the product is returned, shipping prepaid, to an authorised TURBOSOUND service facility.
Defects caused by unauthorised modif ications, misuse, negligence, act of God or accident, or any
use of this product that is not in accordance with the instructions provided by TURBOSOUND, are
not covered by this warranty.
This warranty is exclusive and no other warranty is expressed or im plied. TURBOSOUND is not
liable for consequential damages.
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LMS-D4
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
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