Turbosound Portable Speaker LMS D4 User Manual

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  
 
user manual  
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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user manual  
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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user manual  
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  
LMS-D4 user manual  
Page 17  
 

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