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
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LMS-D4
An exam ple of this equipm ent has been tested and found to com ply with the
following European and international Standards for Electrom agnetic
Com patibility and Electrical Safety:
Conducted and Absorbed Em issions (EU):
Harm onic Current Em isions (EU):
Voltage Fluctuations/Flicker (EU):
Generic Im m unity (EU):
EN55103 (1996)
EN61000-3-2
EN61000-3-3
EN50082-1 (1997)
EN60065 (1998)
UL6500 (2000)
CSA E6500 (1999)
Electrical Safety (EU):
Electrical Safety (US):
Electrical Safety (Canada):
Important Safety Information
Please read carefully and keep the following instructions and safety inform ation.
Heed all warnings and follow all instructions.
•
•
Do not rem ove covers. There are no user serviceable parts inside, please refer
servicing to qualified service personnel. This equipm ent m ust be earthed.
Protect the power cord from being walked on or pinched particularly at plugs,
convenience receptacles, and the point where they exit from the apparatus.
•
•
Only use attachm ents/accessories specified by the m anufacturer.
Servicing is required when the apparatus has been dam aged in any way, such as
the power supply cord or plug is dam aged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been exposed to rain or m oisture,
does not operate norm ally, 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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LMS-D4
Thanks
Thank you for choosing the TURBOSOUND LMS-D4 for your application. Please spare a little tim e
to study the contents of this m anual, so that you obtain the best possible perform ance from this
unit.
All TURBOSOUND products are carefully engineered for world class perform ance and reliability.
If you would like further inform ation about this or any other TURBOSOUND product, please
contact us.
We look forward to helping you in the near future.
Unpacking the LMS-D4
After unpacking the unit please check carefully for dam age. If dam age is found, please notify the
carrier concerned at once. You, the consignee, m ust instigate any claim . Please retain all
packaging in case of future re-shipm ent.
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LMS-D4
Introduction
The LMS-D4 is a com pact and powerful DSP based audio-processing unit designed for use with
particular Turbosound loudspeaker system s and associated bass enclosures, com bining the
functions of m ultiple conventional products in a com pact 1U high 19” rack unit. To achieve this the
LMS-D4 has 2 inputs and 4 outputs, which are configured by different system presets to allow two
basic m odes: stereo 2 way and m ono 3 way. The unit is designed to provide specific equalisation
and crossover points aim ed at optim ising the perform ance of these Turbosound loudspeaker
system s. In addition, lim iters, delays (up to the equivalent of 14 m etres), gain, polarity, and bass
trim controls are accessible to the user in order to m atch specific operation environm ents. The
LMS-D4 is designed for quick setup and adjustm ent via easy-to-use front panel controls.
Features
•
The LMS-D4 provides exceptional audio quality with carefully optim ised processing and high
perform ance converters for a full >108dB dynam ic range, high sam pling rate and m inim al
filtering. Audio-grade capacitors are used in the analogue signal path.
•
Bass boost filter, allowing an easy adjustm ent of the response to m atch variations in acoustic
environm ent such as half space operation (for floor m onitor use), coupling of cabinets in
arrays, or room resonances.
•
Front panel rotary encoder providing a fam iliar and easy to use control form at with all filter
inform ation displayed sim ultaneously on a backlit LCD display.
•
Delay of up to 42m S can be set for each output (m ono) or each pair of outputs (stereo).
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LMS-D4
Front Panel Functions
3
2
6
8
<
BACK
NEXT
>
LMS-D4
SCROLL
A
B
1
2
3
4
CLIP
-24
MENU
ENTER
LIMIT
RS-232
MUTE
DIGITAL LOUDSPEAKER MANAGEMENT SYSTEM
1
4
5
7
9
10
1. LCD Display - Shows menu options, output inform ation and the param eters being adjusted.
2. Menu Key - Activates the m ain m enu on the LCD display, and toggles between m enu options
and system nam e display. Different m enus are selected by pressing the ‘BACK’ and ‘NEXT’
keys.
3. Next Key - Moves forwards through the list of available m enus or options
4. Back Key - Moves backwards through the list of available m enus or options.
5. Enter Key - Enters the chosen m enu and confirm s m enu selections.
6. Scroll knob - The rotary encoder allows the current param eter displayed on the LCD screen to
be adjusted, and scrolls through the available list of presets.
7. Input LED’s - The bottom green LED indicates when the input signal is at -24dBu, whereas the
top red LED indicates overload of the analogue to digital converter.
8. Lim iters LED’s – Indicates when lim iting occurs on a particular output channel. The red LED is
set at the lim iter threshold for that channel, provided lim iter and gain settings are correct.
9. Mute Key – This m ute key is active on all four output channels sim ultaneously. The red LED is
illum inuted when the channels are m uted.
10. RS232 input – The 9-pin socket allows com m unication with a PC via a serial COM port and a
standard RS232 cable.
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LMS-D4
Rear Panel Functions
1
OUTPUT
4
OUTPUT
3
OUTPUT
2
OUTPUT
1
RIGHT
/
MONO IN
LEFT IN
LMS-D4
SERIAL NO.:
PIN1=SHIELD
PIN2=HOT
STAR ROAD, PARTRIDGE GREEN, WES
T
SUSSEX, RH13 8RY
PIN3=COLD
THIS APPARATUS MUST BE EARTHED.
DO NOT EXPOSE THIS UNIT TO MOISTURE.
DO NOT REMOVE THIS COVER.
NO USER SERVICEABLE PARTS INSIDE.
REPLACE FUSE WITH SAME TYPE ONLY.
MADE INTHE E.U.
POWER
50/60Hz 100V-240V
~
Fuse Sticker
2
4
3
1.
2.
Mains Power - Connected via a standard IEC socket. A com patible power cord is supplied
with the unit.
Mains Fuse - Located in a finger-proof fuseholder integral to the m ains inlet. Always replace
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 Inputs - 3 pin fem ale XLR connectors are provided for each audio input. All
term inations are electronically balanced, pin 2 Hot, pin 3 Cold and pin 1 Screen (shield). The
input sensitivity is pre-set at 0db. The overall default gain of the unit is set at -14dB. Please
note that when the unit is operated in m ono 3-way m ode, the input signal is to be fed into the
RIGHT / MONO connector.
4.
Audio Outputs - 3 pin m ale XLR connectors are provided for each audio output. All
term inations are electronically balanced, pin 2 Hot, pin 3 Cold and pin 1 Screen (shield).
Please note that connecting to unbalanced am plifier inputs should be avoided as it will result
in a 6 dB loss of level, and lim iters settings will be out by 6 dB.
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LMS-D4
Outputs are configured as follows:-
O/P 1
System
O/P 2
O/P 3
O/P 4
TQ-308 Passive
TQ-308 Pas + Sub
-
Left
-
Right
Left Sub
-
Left Main
Left
Right Sub
-
Left Main
Right
TQ-310 Passive
TQ-310 Pas + Sub
TQ-310 Pas. Monitor
TQ-315 Passive
TQ-315 Pas + Sub
TQ-315 Pas. Monitor
TQ-315 Biam p
TQ-315 Biam p + Sub
TQ-315 Biam p Mon.
TQ-440
Left Sub
-
Left Main
Left
Right Sub
-
Left Main
Right
-
Left
-
Right
Left Sub
-
Left Main
Left
Right Sub
-
Left Main
Right
Left LF
-
Left HF
Sub
Right LF
Low
Right HF
High
Left LF
Left LF
-
Left HF
Left HF
Sub
Right LF
Right LF
Low
Right HF
Right HF
High
TQ-440 + TQ-425
TFM-420
Left LF
Left LF
Left LF
-
Left HF
Left HF
Left HF
Sub
Right LF
Right LF
Right LF
Low
Right HF
Right HF
Right HF
High
TFM-450
THL-2
THL-2 + THL-828
THL-811 + THL-828
TQ-200 Series
TCS Series
Left Sub
Left Sub
Left Sub
Left Sub
Ch A
Ch A Left
Left Main
Left Main
Left Main
Left Main
Ch B
Right Sub
Right Sub
Right Sub
Right Sub
Ch C
Right Main
Right Main
Right Main
Right Main
Ch D
TXD Series
Mono Flat
Stereo Flat
Ch B Left
Ch A Right
Ch B Right
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LMS-D4
Operating the LMS-D4
With the unit m ounted 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 am plifiers. It is
good practice to switch on the LMS-D4 before powering up the am plifiers.
When you plug the LMS-D4 into the m ains 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 current software version is also displayed for 10 seconds at start-up. The red Mute
LED will also be illum inated, as the unit powers up by default with all outputs m uted.
Menu Structure
The structure includes three sub-m enus: Load a Xover, Xover Setup and Utilities. Their operation
is described in the next paragraphs. To access m enus, press the ‘MENU’ key and then use ‘BACK’
and ‘NEXT’ to navigate. Finally press ‘ENTER’ when the desired sub-m enu appears on the display.
System Selection
This m enu allows the selection of a particular loudspeaker system and configures the LMS-D4
accordingly. It sets equalisation, crossovers, and other param eters to optim al default values and
the factory presets.
To display and go through the available system s, use the ‘SCROLL’ rotary encoder. The system
nam es will appear on the bottom line of the display. Once the desired configuration appears,
confirm the selection by pressing ‘ENTER’. Please note that this will cause the outputs to be
autom atically m uted; this is to lim it accidental change that could endanger the loudspeaker
com ponents. After a system is loaded the lim iter settings m ust be adjusted since the default
setting is ‘OFF’.
Xover Setup
This m enu allows you to change the settings of a num ber of param eters, also refered to as “user
controls”. They are detailed in the next section.
Having entered the ‘Xover Setup’ m enu, the inform ation 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 nam e of the param eter being edited.
3) At the right hand side of the bottom row:- the value of the param eter.
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 ‘NEXT’ and ‘BACK’ keys to navigate through the accessible user controls. Then when the
desired control appears on the display, use the the ‘SCROLL’ button to change the value as
displayed on the bottom row.
IMPORTANT: Check that the lim iter and am plifier settings are correct and that m ixer levels are
m inim ised before unm uting the LMS-D4.
Utilities
This m enu gives access to three features as indicated below:-
Lock/unlock
Locking the unit will prevent any change of the system in use as well as editing 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
m ove 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, sim ply follow the sam e procedure.
Clear User Setups
This stores the factory preset (default) values for the system currently selected. As a result any
change previously m ade to the user controls values will be cancelled.
Download from PC
A standard 9 pin RS-232 type connector is provided to facilitate the future im plem entation of
software downloads and future upgrades. To download new flash m em ory data this option m ust
be enabled.
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LMS-D4
CROSSOVER SETTINGS
1) Input Gain
INPUT GAIN
Gain = 0.0dB
The input gain sets the attenuation of the signal before any processing is applied. The value
ranges from -40dB to +6dB in 0.5dB steps. In stereo m ode the gain value applies to both inputs.
2) LF Bass Boost
BASS BOOST
Trim = 0.0dB
Where im plem ented, 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 typically it is around 100Hz.
The Bass Boost control allows for an easy adjustm ent of the response to m atch variations in the
acoustic environm ent. Generally the 0 dB setting will provide an optim ally flat response for a
single cabinet in free space.
When the cabinet is used in direct proxim ity of a reflecting surface (i.e. half-space conditions), the
LF level should be reduced to m aintain the sam e balance (in theory by 3dB). Sim ilarly when a
num ber of cabinets are closely 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 to the tonal balance. Please
rem em ber to use it with care, as excessive boost could m ean m ore stress for the drive units and
m ake it m ore critical to have the lim iters accurately set.
Bass boost is not im plem ented in settings for speaker system s with subwoofers.
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LMS-D4
3) Sub-bass channels operation mode
OP1+3 Sub
Mode = Stereo
The possible values are ‘Stereo’ and ‘MonoSum L+R’. With a system using a stereo two way
configuration and having channels 1 and 3 dedicated for sub-bass operation, it is possible to set
these channels either as independent (i.e. in stereo m ode) or with the signals from both Left and
Right inputs sum m ed. Note: this screen is not available on m onitor program s or bi-am p with sub
program s.
4) Peak Limiters
OP1+3 Sub
Limiter = +5dBu
Each output has an independent high perform ance lim iter, with both attack and release tim es fixed
and optim ally preset according 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 to correctly set lim iters for your speaker system :
1. Determ ine the program power handling of the Turbosound loudspeaker (or HF/LF section
as appropriate), or from the engineering data sheet or user m anual for that product, or
from the label on the rear of the cabinet.
2. Calculate the required lim iter voltage using the form ula:
V = √PR
where V is the lim iter voltage setting,
and P is the program power rating of the loudspeaker,
and R is the nom inal im pedance of the loudspeaker
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LMS-D4
3. Scroll to set the nearest lower voltage to the calculated value in the lim iter screen for that
loudspeaker m odel (or frequency band as appropriate), and press ENTER. Refer to the
lim iter voltage lookup table in Appendix A for a range of approxim ate conversion values.
In addition to those values, the lim iters can also be defeated (OFF displayed on the screen). Please
note that this setting should be used only if the am plifiers already have internal lim iters or soft
clipping circuitry.
5) Channel Gain
OP1+3 Sub
Gain = 4.0 dB
Set the gain of the specified output channel relative to the other channel(s). Available values are
from +6.0 to –19.4 dB, in 0.2 dB steps. Note: with lim iters and am plifier gain set correctly, 0dB
relative gain will give m axim um output.
6) Polarity
OP1+3 Sub
Polarity = Normal
Define the polarity of the specified output channel. The value can be norm al 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
increm ents, with a m axim um value of 20.7 m s (≡ 7.1 m etres) in stereo two way configurations, and
42 m s (≡ 14.4 m etres) in m ono three way configurations. These delays are provided (their range is
large enough) to align the driver com ponents in the tim e dom ain – including separate sub-bass
cabinets – but will not replace a dedicated delay line unit in applications such as distributed
system s.
Please also note that, as with other sim ilar digital processing units, the values displayed are
relative and do not take into account the basic processing delay of the unit which is approxim ately
0.4m s.
When adjusting the delay on bi-am ped loudspeakers it is im portant to ensure the difference
between channels rem ains 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, the user edited
value will return to their preferred settings.
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LMS-D4
Specifications
Inputs
Two electronically balanced nom inally 0db
10 kOhm
Im pedance
Outputs
Four electronically balanced nom inally 0db
600 Ohm
Min. Load
Max. Level
Frequency Resp.
Dynam ic Range
Distortion
Maxim um Delay
Output gain
Bass Boost
Lim iters
+19dBu into 2kOhm load
±0.5dB 20Hz - 20kHz
110dB (typ.) 20Hz -20kHz unweighted
< 0.02% @ 1kHz, +18dBu
up to 42 m s (increm ent 21 µs)
adjustable -15dB to +15dB in 0.5dB steps and m ute
shelf adjustable ±6dB in 0.5dB steps
threshold adjustable over an equivalent voltage range of 30 dB range, in 0.5dB steps
2 x 20 character backlit LCD
Display
Input LED
Lim iters LED
Connectors
Inputs
Two per input, signal at -24dBu and digital clip
One per output
3 pin fem ale XLR
Outputs
3 pin m ale XLR
Mains
3 pin IEC
Power
100 to 240V ±10% @ 50/60Hz
Consum ption
Weight
6.5 watts.
2.3 kg net (3.5 kg shipping)
Size
1.75”(1U) x 19” x 6.4” (44m m x 482m m x 162 m m ) excluding connectors
Due to continuing product im provem ent the above specifications are subject to change.
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LMS-D4
WARRANTY
This product is warranted against defects in com ponents and workm anship only, for a period of
one year from the date of shipm ent to the end user. During the 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 m odifications, m isuse, 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 dam ages.
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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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