Turbosound LMS-A6 User's Manual
Contents
1. Connecting Remote Standby A two wire connection may be made between this connector and a single pole switch located at your mixing console or any other operating position When this switch is open the unit functions normally and the outputs follow the MUTE switches on the front panel When the REMOTE switch is closed all outputs are muted and the red REMOTE STANDBY LED lights The switch should be floating and isolated from external grounds No damage will occur if the wires short to ground but proper operation is not guaranteed Remote Standby Cancel This switch enables or disables the REMOTE STANDBY function Putting this switch up CANCEL will disable the remote function You may wish to cancel the remote switch if it has been left in standby mode but you wish to regain local control If the Remote Standby function has not been wired up this switch does nothing and may be set to either position Mono Band 1 How loud a system of a given power will go is usually limited by the lower frequencies This is because low frequency signals require higher voltage swings hence more power than high frequencies In order to make best use of the headroom available from the amplifiers and low frequency loudspeakers it is common practice to send all low frequencies to both channels in a stereo system This has little impact on the stereo image in most situations user manual LMS A6 When this switch is up on the Left and Right Band 1 s2. Some of the custom operating parameters will have been set internally when unit left the factory These are described in this section and you must check that these are appropriate for your system Internal factory set parameters Check the supplied documentation to ensure these parameters are correct for the particular system you are setting up Incorrect settings can damage the loudspeakers especially the more delicate H F unit If any internal settings are wrong for your system contact your Turbosound Dealer about obtaining the correct custom plug in modules Crossover frequencies and slopes There are two stereo frequency programming cards located internally Card 1 handles band 1 information and card 2 band 2 amp band 3 information The crossover frequencies and slopes will have been specified when the unit was purchased The limiter time constants and the band edge phase adjustment time constants will automatically have been optimised for the corner frequencies The relevant frequency slope and response type is recorded on a label attached to the respective cards and also on a label attached to the right hand side panel of your unit If in the future your unit is to be used to drive loudspeaker systems other than that for which it was originally configured then replacement frequency programming cards can easily be fitted Band Gain The gain of each band is normally set to unity but for systems where the sensitivity of the Am
3. Turbosound LMS A6 LOUDSPEAKER MANAGEMENT SYSTEM USER S 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 user manual LMS A6 LMS A6 user manual Page 2 CONTENTS important Safety INIO atON scacesece sec sinoni NEEN EEEREN EE CERE E ENEE NEE E EEE AEE EEE EEEE EEEE 3 THANE Secma 4 Jonae raa rE CN A e a terete tere rerercerere 4 Ugane CIE COD ET EEE T ETET EATA E E E E E EEEE E E P E E 5 POON OS E T E E E T 5 eee co Bacio a ee 6 Rear ir UnC UON eE 7 Setting up and operating the EM S AG visesasescursasasesaceecevincestapeecssdanteaesaesiaseeiusiacesaevieceetee ones sdasieaseaeeieaeeteces 8 Internal factory set parameters wescsccacovcsccacsessenosannuatereceaeaescdesccedcsucuden nies vdensiudedecedae cae vieeseeeatecdenseeavien 8 Crossover frequencies and slopes wssiwisesdiewinavivenduanevacdnavasewavandvansuneseasvetinesivatauentuctaves tnezavencveneesasietiens 8 BanG Ce saeed 8 lee ON a E T AT A OAE E EEE A ET 8 Mains SUPDIY V OAC essen a a a ERR 8 Connecting inputs and OUTPUTS sssssssssiisrpnnnohis ainiko o na oinean nani in oka ORON narn he anis Nia 9 Toe Fower SUPHIY SCHON serren e eee eee ere eee nee eee et rere 9 Power On Standby MOG acres cis ac ce rem er crreee cette ate EAEn ere EEE RSE AA ERE NENIET 10 REMOLESII DADY oia a AT Eira 10 Connecting Remote Stand Dy qcisecccsacs setters ees asna E a a OESE EAEE DEEN 10 PRETO bes
4. a level that affords protection to the speaker drive units The time constants for the limiters are set internally and are preset to be optimum for each frequency band being protected Limiter Threshold setting The limiter threshold switches are located behind a security cover on the rear of the unit Each Band has an independent 10 position switch to accurately set the threshold The switches are calibrated in 1dB steps from 1dB Pos0 to 10dB Pos9 In a high powered system where the amplifier output power is below or equal to the rating of the speakers the limiter thresholds will nominally be set to 1dB below the clipping level of the amplifier This prevents severe clipping from driving the cones with square waves but does not LMS A6 user manual Page 11 user manual LMS A6 LMS A6 user manual Page 12 restrict the full undistorted output of the amplifiers Note that the actual output power available often depends on the mains supply voltage which may sag during heavy performances In a system where the amplifiers are capable of exceeding the ratings of the speakers set the threshold to a level appropriate to the speakers and NOT the clipping point of the amplifier This is normally achieved by feeding the system with pink noise at the maximum level required and then turning down each limiter threshold switch until the yellow LIM LED is just flashing Limiter Cancel When up CANCEL this switch will disable all
5. filter Low mid filter High mid filter Ultra sonic filter Response Limiters Threshold Output meters Connectors Inputs Outputs Power Power Fuses Consumption Net weight Size user manual LMS A6 Two electronically balanced gt 10k ohms gt 65dB 50Hz 10kHz Six electronically balanced lt 600hms 6000hms 20dBm into 600 ohm load 0 5dB 20Hz 20kHz gt 110dB 20Hz 20kHz Unwtd lt 0 02 1kHz 18dBm 650 mS Increment 2 6 uS adjustable 6dB to 6dB 1 of each per output user specified up to 24dB octave user specified up to 24dB octave user specified up to 24dB octave user specified up to 12dB octave Bessel Butterworth 12 18 24dB oct and Linkwitz Riley 24dB oct 1dB to 10dB in 1dB steps 6 x 6 point 24dB to 4dB into limit 3 pin female XLR 3 pin male XLR 3 pin IEC 85 to 130V or 190 to 260V set internally 50 60Hz 230V T200mA 115V T1250mA 25 VA 3 9kg 8 6lbs 1 75 1U x 19 x 9 9 44mm x 482mm x 252mm excl connectors Due to continuing product improvement the above specifications are subject to change LMS A6 user manual Page 13 user manual LMS A6 LMS A6 user manual Page 14 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 the warranty period TURBOSOUND will at its discretion either repair or replace products which prove to be defective prov
6. in case of future re shipment user manual LMS A6 INTRODUCTION The LMS AG is a versatile two input six output analogue loudspeaker management system in a 1U rack mount package that is designed for maximum sonic performance It combines crossover and limiter functions and is uniquely configurable to custom requirements The LMS A6 can be configured for the following modes of operation stereo 3 way stereo 2 way mono 4 way plus mono 2 way The standard filter provided for the LMS A6 is a Linkwitz Riley response based on two second order Butterworth circuits in series The response is 24dB octave slope with a corner frequency where the output of the filter is 6dB down from its pass band level The use of these filter realisations has been well documented and provides the best possible phase and amplitude response for driving loudspeaker systems Active crossovers versus passive crossovers Passive crossovers divide the frequency spectrum after the signal has been raised to high power levels They are generally bulky heavy and inefficient Active crossovers utilise IC s and transistors and divide the frequency spectrum at line level immediately ahead of the amplifiers An active crossover does the same job as a passive crossover but with more precision flexibility efficiency and quality Crossover frequencies can be readily altered to suit different driver combinations the level balance between two or three frequency bands can easil
7. riGHT BAND 1 BAND 3 LeFt BAND 2 LeFr BAND 1 Designed amp manufactured in the UK by QMS Ltd RIGHT INPUT LEFT C Q Q Q Q 230V rere as O E ERALA EEIN O co O oO R Band 3 L R Band 2 L R Band 14 Oo Oo fisv somh O gt lolalolole O Bee oo gt gt 6 lejejejejejo O 6 O 5 6 Q 1 Mains Power Connected via a standard IEC socket A compatible power cord is supplied with the unit 2 Power Switch 3 Mains Fuse Located in a finger proof fuseholder adjacent to the mains inlet Always replace this fuse with the correct type as shown on the rear panel legend 4 Remote Standby connector for remote switch connection 5 XLR Outputs 3 pin male XLR connectors are provided for each audio output All terminations are fully balanced pin 2 Hot pin 3 Cold and pin 1 Screen shield 6 Limiter threshold sets limiter threshold for each output band 7 XLR Inputs 3 pin female XLR connectors are provided for each audio input All terminations are fully balanced pin 2 Hot pin 3 Cold and pin 1 Screen shield LMS A6 user manual Page 7 user manual LMS A6 LMS A6 user manual Page 8 SETTING UP AND OPERATING THE LMS A6 This section describes the steps and checks to be taken when setting up the unit for the first time and the operation of all the controls and indicators
8. CINCY GIACE beseni A e N 10 MOn BA T EARE a a a E 10 Level Tri S csip ORERE E IRERE AEREA 11 TEV PS a a eee ee 11 Limiter seting and Operati ON sissiere tects cota E E a 11 Gmiter Threshold Seting amissa ee nee eee eee eee eee eee ee eee 11 Limiter CAN CG ls sescte ca peccsecctnceececesetecednscieccsancdenenecsiee Gua vdec utes E A eA 12 Output Level and Limiter METET cssiscnesscciesisracdeetsreteressesncnes te a E 12 Bond NUES nia Ein i 12 Technical specihicanoN Sessor E A a RAAE ASARRE STARRE 13 Wari aniy sxsesiecceceaec cece tactcetcceccencccsetessescccetecasicesecneicesecesicetecesiceses veieeteas cece seaesteecaesiseteseseieseaestexeeerseaeeeses 14 user manual LMS A6 An example of this equipment has been tested and found to comply with the 3 following European and international Standards for Electromagnetic Compatibility and Electrical Safety Radiated Emissions EU EN55013 1 1996 RF Immunity EU EN55103 2 1996 RF Immunity ESD Burst Transient Surge Dips amp Dwels Electrical Safety EU EN60065 1993 IMPORTANT SAFETY INFORMATION Do not remove Covers There are no user serviceable parts inside please refer servicing to qualified service personnel This equipment must be earthed 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 HUMITE It should not be necessary to remove any protective eart
9. by switch determines the power up mode in the up cancel position the unit automatically switches out of mute after six seconds in the down position the unit remains in standby mode with all outputs muted 4 Remote Standby cancel enables down position or disables up position the REMOTE STANDBY function Inoperable if the remote stanby function has not been wired up 5 Phase adjustment variable adjustment between 0 and 180 6 Gain trim allows the band 1 gains and band 3 gains to be adjusted to match band 2 where speaker amplifier sensititvities vary for each band 7 Polarity reverses the polarity of the selected frequency band 8 Mute LED indicates mute staus of the selected channel 9 Mute key one latching mute switch per output channel Press to mute press again to un mute 10 Output meters LED ladder displays headroom before limiting occurs The lower four green LEDs indicate 24dB 12dB 6dB and 1dB respectively with the orange LIM LED set at the limiter threshold for that channel The top red LED indicates 4dB of limiting 11 Power green LED indicates that power is applied to the unit 12 Standy Mute red LED indicates when the standby mute mode is set 13 Limiter Cancel indicates when the limiter cancel mode is set LMS A6 user manual Page 6 user manual LMS A6 REAR PANEL FUNCTIONS 2 MAINS S No 10 1001 A BAND 3 RGHT BAND 2
10. ect AC fuse is fitted If it does not contact your Turbosound Dealer for instructions on setting the LMS A6 to the correct voltage Connecting to the wrong voltage may damage the unit The unit must be switched OFF before inserting or removing the mains cord When the system is powered and turned on the green POWER LED on the front panel lights If the LED fails to light when power is applied and switched on check and if necessary replace the AC fuse If this does not solve the problem then an internal fuse may have blown This indicates that the unit has a fault and you should contact your Turbosound Dealer for further advice LMS A6 user manual Page 9 user manual LMS A6 LMS A6 user manual Page 10 Power On Standby Mode When power is first switched on the LMS A6 enters STANDBY mode In this mode all outputs are muted to suppress any noise or transients while the circuitry settles down The POWER STDBY switch determines how the unit will behave after power is applied Switch down The unit will stay in standby mode All outputs will stay muted and the red STANDBY MUTE LED will light The standby mode is cancelled by pressing any MUTE switch or momentarily operating the REMOTE STANDBY switch Switch up CANCEL The unit will remain muted for about six seconds and then automatically come out of standby mode In either case the normal band MUTEs will remain as they were when the unit was last used REMOTE STANDBY
11. h or signal cable shield connections Do not defeat the purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wider blade and the third prong are provided for your safety When the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Only use this equipment with an appropriate mains cord In the USA the cord should comply with the requirements contained in the Standard for Cord Sets and Power Supply Cords UL 817 be marked VW 1 and have an ampacity rating not less than the marked rating of the apparatus LMS A6 user manual Page 3 user manual LMS A6 LMS A6 user manual Page 4 THANKS Thank you for choosing the TURBOSOUND LMS A6 for your application Please spare a little time to digest the contents of this manual so that you obtain the 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 future UNPACKING THE LMS A6 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
12. ided that the product is returned shipping prepaid to an authorised TURBOSOUND service facility Defects caused by unauthorised modifications 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 implied TURBOSOUND is not liable for consequential damages 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
13. ignals are summed together and fed in mono to both Band 1 outputs When the switch is down the Left and Right Band 1 signals remain independent from each other Level Trims Band 1 and Band 3 have independent gain trims for fine adjustment of the system frequency response If the internal preset band gains have been specified correctly these controls will nominally all be set central at OdB The 6dB range should be more than sufficient to balance your system in any realistic situation Band 2 gain is taken as the reference level and the Band 1 and Band 3 controls will be adjusted for correct spectral balance Phase Adjustment In a theoretically ideal speaker design the drive units for adjacent bands would be in perfect alignment and their signals would combine to give perfect summation at the crossover point However realistically this seldom occurs and shifting the phase of one of the signals in the crossover region will improve the summing and therefore the frequency response of the system Each phase control gives nearly 180 degrees of adjustment Used in combination with the POL Switch we can achieve continuous adjustment over a full 360 degrees There may be some interaction between the phase controls in each channel especially if the MID Band Band 2 is fairly narrow so it is advisable to further fine tune the phase by repeating the above process a second time LIMITER SETTING AND OPERATION The limiters should be set to
14. limiters and the yellow LIMITER CANCEL LED will light It is normally only used when setting up and calibrating or trouble shooting the system When the limiters are cancelled the output meters will continue to operate normally up to the limiter threshold Output Level and Limiter Meter The lower four green LEDs show the signal level in dB relative to the limiter threshold i e they always show the signal headroom that is available before the limiters will start operating The yellow LIM LED lights when the threshold has been reached and the limiter is operating The top red LED lights when the input signal is causing 4dB or more limiting to occur If during use the 4 LEDS are on for more than occasional brief flashes the input signal is too hot and should be turned down at the mixing console to reduce distortion Band Mutes Each output has an independent MUTE Switch and red MUTE LED These are latching switches which will retain their settings even when power is turned off and on again Note that the MUTE LED will always follow the position of the MUTE switch regardless of the status of the standby mute If the expected output signal appears to be muted but the MUTE LED is not lit then check the STANDBY MUTE LED TECHNICAL SPECIFICATIONS Inputs Impedance CMRR Outputs Source Imp Min Load Max Level Frequency Response Dynamic Range Distortion Maximum Delay Output gain High and Lowpass Filters Filters Subsonic
15. plifier Speaker combinations for each Band are different the gain of each band may have been set to compensate This allows the Level Trim controls to be nominally set to centre Equalisation Either static or dynamic equalisation may have been installed on an optional internal module Mains Supply Voltage The unit will have been set for either 115V AC or 230V AC operation as indicated by the label on the rear of the unit user manual LMS A6 Connecting inputs and outputs This section describes how to connect signals to the LMS A6 loudspeaker management system The signal inputs are industry standard female XLR connectors and are wired as follows Pin 1 GROUND or COMMON Pin 2 HOT or or In phase Pin 3 COLD or or Out of phase The electronically balanced inputs will take a maximum level of 20dBu at 10k ohm impedance They will accept either balanced or unbalanced signals The signal outputs are industry standard male XLR connectors and are wired as follows Pin 1 GROUND or COMMON Pin 2 HOT or or In phase Pin 3 COLD or or Out of phase The output impedance is less than 100 ohms and the maximum signal level is 20dB The electronically balanced output stage will drive either balanced or unbalanced loads THE POWER SUPPLY SECTION The power supply section includes an IEC connector ON OFF switch and an AC fuse Check that the voltage label corresponds with your local mains supply and that the corr
16. y be trimmed and line driving system muting signal summing driver equalisation and phase adjustment facilities can all be incorporated into active crossovers FEATURES e Maximum sonic performance advanced circuit design for exceptional dynamic range and sonic quality e Interchangeable frequency programming cards set the required crossover frequency and slope of your loudspeaker system These are supplied when the unit is shipped from the factory e A flexible 2 input 6 output multi mode format featuring a choice of stereo 3 way stereo 2 way mono 4 way plus mono 2 way crossover modes with limiters e High performance limiters are provided one for each output band Limiter threshold is set by means of 10 position switches located behind a security panel on the rear of the unit e Electronically balanced inputs and outputs ensures a high level of rejection for common mode rejection signals and gives a professional connection to external equipment LMS A6 user manual Page 5 user manual LMS A6 FRONT PANEL FUNCTIONS 24 5 7 8 11 12 000000 O00000 O00000 oOo0oo0o000 oe B P 1 Mono Band 1 sums the Left and Right Band signals together up position and feeds them in mono to both Band 1 outputs 2 Limiter cancel disables all limiter functions and causes the LIMITER CANCEL LED to light 3 Power Stand
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