Bogen M300 User's Manual
Contents
1. 1 Package Contents t do di Ele e issue 1 PANEL DESCRIPTIONS 2 2002200r000r000e0snensnnesnnsssnnssnnssnnnsnnensnnssnnssnnnsnnnsnunnne 2 3 M Class Eront Pariel 1822 el Ei 2 M Class Rear Panel tet tette ssaadean iaedescdeaieostiadess 3 INSTALLATION Q 4 6 Installation Components 2 ea ee ek 4 Ventilati n 2 2 e tdeo rh e odia Rack Mounting Table Mounting sisien Module Installation CONNECTIONS 22urs2000r0000020000200000200002220022 A KEENNESS ESENE TARNESAS NEA S TARASS SPEAKERS 55h reet a a aA a BR En 7 Low Impedance Speaker Connections seen 7 Earth Ground Terminal iater aident thee nae in gbens 7 70V Transformer Coupled Speakers sse 7 BAL1S Mod le Input irrito P e etse letto se tbe et 7 Balanced Input Connections sse ttes 7 Unbalanced Input Connections seen 7 OPERATION Controls amp Connectors Leve l Controls 2 tette t Reed eet aede dete Sleep Made Defeat te SHE i eee vetat Rad 8 Channel Balance Lo Cut Switch aueh ater tti casei dete ite ante Effects LOOP e RR HO tete teretes 9 Output Feeds 5r Et te ba ol eia 9 Modes of Operation nun unless halle 9 10 Stereo Mode stie rtp adi iet er et nn einge 9 70V Mono Mode aieo de etel een 10 Dual Mono Mode r2. m S 2 us usten 1 En m Shi UUVUVUUVUUVUVUVUUUVV MONO UUVUUVUVVVVUVVUVUVUVVUV DUAL MONO gt nn An a bal O usc uon S e E QM ERU 0 Hz EFFECTS LOOP OUTPUT FEED DS CHANNEL our IN PREEQ POSTEQ n s UUUUUUUUUUUU IL D UUUUUUUUUU P Accepts up to 10 spade lugs for low impedance speaker connections M Class Rear Panel 1 Low Impedance Outputs 2 Channel Balance Only active in Dual Mono mode Allows one channel s volume to be adjusted relative to the other channel 3 4 Effects Loop In Out The effects loop connectors provide an insertion point for outboard signal processing equipment when the M Class is operating in either 70V Mono or Dual Mono mode where inputs provide a 2 1 mixer function 5 6 Output Feeds Pre Post EQ Two different output feeds are provided that can supply signal to other audio equipment Both outputs are designed to feed high impedance unbalanced inputs of external equipment The Pre EQ Output Feed provides a signal before any external signal processing The Post EQ Output Feed provides a signal that has been affect ed by the external signal processing equipment and the lo cut filter 7 Operational Mode Selector The M Class amplifer has 3 distinct modes of operation Stereo 70V Mono Dual Mono that are designed to provide a wide range of application coverage For a description of the different modes see the Operation sec tion of this manual 8 Fan Exhausts Two independent
3. BOGEN COMMUNICATIONS INC 50 Spring Street Ramsey NJ 07446 U S A Tel 201 934 8500 Fax 201 934 9832 Web Site www bogen com E mail info bogen com
4. Dual Mono mode of operation In Dual Mono mode both amplifier channels get the same audio program at the same level To provide some direct control over the amplifier volume levels a Channel Balance control is provided This control allows the adjustment of one amplifier channel out put volume over the other To reduce the volume level of channel B while leaving channel A s volume unchanged the Channel Balance control is rotated counterclockwise The diminishing arrow with the B next to it indicates that rotating the control in that direction diminishes the B channel vol ume Likewise for reducing channel A volume Putting the control at the center of rotation allows equal and maximum volume from both channels CHANNEL BALANCE Lo Cut Switch The M Class amplifier is a direct coupled amplifier which means that there are no out put transformers used to deliver the 70V audio to the speakers Because of this the M Class amplifier has a Flat frequency response below 20Hz This extended low fre quency operation can be troublesome for some transformer coupled speakers typical ly used in 70V audio systems The relatively inexpensive transformers used in these speakers cannot handle frequencies much below 60Hz When frequencies lower than this are applied to these speaker s transformers they can saturate causing distortion and high instantaneous power consumption The Lo Cut filter allows a low frequency roll off
5. control Microphone level is also affected by changes in these level controls but is to be main ly set by the Gain control on the MIC1X module Not applicable in stereo mode Module Adjustments Adjust Gain of MIC1X to desired paging level Adjust Bass amp Treble of MIC1X module to appro priate level Adjust Gate controls of MIC1X for optimum paging control Adjust ducking control on BAL1S for desired mute level 12 Application 3 Global music message buffered and distributed to multiple amps with local override input for each amplifier Similar to the paging situation found at airport departure gates global music messages play when no local page is present During local page from departure gate microphone music message mutes to predetermined level and page is heard only in local area When local page is complete global music message fades back to previous level During local zone page global music message mutes only in local area then fades back Buffered global music mes sage signal is unaffected by local paging condition Module Bus Assignment Priority Setting MIC1X Bus A only Priority 1 BRG1R Bus B only Priority 42 Mode of Operation 70V Mono or Dual Mono Amplifier Adjustments Volume of local departure gate MIC is adjusted by the A Level Control Global music mes sage source is adjusted by the B Level Control Set Lo Cut or Channel Balance depending on mode of operation Module Adjustments Adjust Gain to
6. make each sources input similar Adjust Bass amp Treble where applicable to your preference Adjust Ducking on BRG1R for desired level Adjust Gate control on MIC1X for optimum paging oper ation Application 4 2 mono zones low impedance speakers telephone paging and background music Zones have significantly different volume levels Background music plays through the system when no page is being made One zone is low volume while the other is high volume During a telephone page the background music mutes to a predetermined level and the telephone page is heard at correct volume level for each zone When the page is complete the background music fades back to its previous level Module Bus Assignment Priority Setting TEL1S Bus A only Priority 1 MAX1R Bus B only Priority 2 Mode of Operation Dual Mono Amplifier Adjustments Volume of the telephone page is adjusted by the A Level Control Background music level is adjusted by the B Level Control Set the Lo Cut switch to Flat or 65Hz Channel Balance control on rear of ampli fier adjusts the volume level of one speaker zone over the other zone Rotate the Channel Balance control towards the B marking counterclockwise to reduce the volume level of the speakers connected to the A output ter minals while leaving the volume level of B speaker output unchanged Module Adjustments Adjust Gain to make each source s input level similar Adjust Bass amp Treble where
7. or Dual Mono modes the module signals will be mixed see 70V Mono Mode under the Operation sec tion of the manual For maximum control when mixing signals it is important that each of the two input mod ules be set so that the outputs feed different audio buses Otherwise proper mixing of the signals will be diffi cult Check that each module is set to a different audio bus before installing it 10 Modules Standard Input Module The M Class is shipped with one input module the BAL1S pre installed The BAL1S provides 2 high imped ance balanced low noise inputs This module provides a standard 2 channel amplifier input but can be replaced by other modules if desired The input s connectors Qo labeled A amp B correspond to the similarly marked rear speaker connections and front panel controls The BAL1S inputs are permanently assigned to their respec tively labeled audio buses BALS MUTING The BAL1S has a priority jumper that can set the mod ule to be muted by any other modules installed or to never mute When signaled to mute by another module the BAL1S will reduce the level of both channel s input BOGEN signals by the amount set by the ducking control DUCK When the mute is released the module will fade the input signal levels back to the previous level Other Modules Various modules can be installed in the M Class amplifier Refer to the instructions that come with
8. to be introduced into the output signal preventing the speak ers from receiving too much low frequency content The 65Hz position should be used for all transformer cou pled cone type speakers The higher frequency roll off of 125Hz provides an extra level of safety for horn speak ers Some horn speakers can be adversely affected by frequencies below 120Hz since they are designed to reproduce higher frequency signals Effects Loop EFFECTS LOOP The effects loop connectors act as an insertion point for outboard signal processing equipment when the M Class is operating in either the 70V Mono or Dual Mono oul IN modes In these modes the inputs and front panel controls form a 2 1 mixer Connect the Effects Loop Out to the input of the external signal processing equipment Connect the Effects Loop In to the output of the external signal processing equipment Inserting an RCA jack into the Effects Loop In connector will automatically disconnect the input module signals from the power amp stage so it can be routed through the external equipment Removing the jack from the Effects Loop In connector will reestablish the direct connection of the input modules to the power amp stage The Effects Loop signals are quasi balanced which means that they are intended for use with unbalanced equipment but will improve the noise immunity However it is still a good practice to keep these connections as short as pos sible Output Feeds OUTPUT FEEDS PREE
9. variable speed cooling fans respond as needed to keep the amplifier cool and reduce dust build up 9 70V Mono Speaker Output For 70V constant voltage speaker systems Provides a single channel of amplification 10 Chassis Ground Provides convenient access to earth ground 11 Lo Cut Switch Select a low frequency roll off of 65Hz or 125Hz for transformer coupled and horn speakers Flat position allows full low frequency performance 12 BAL1S Input Module Provides a balanced high impedance input for each channel The BAL1S Input Module is included standard with the amplifier 13 Module Bay Accepts one or two Bogen input modules BAL1S included with amplifier 3 Installation Front Casting Snap Slots Installation Components 1 Rack Ears Prior to installing the amplifier you will need to attach the installation rack ears if you intend to install the ampli fier in a rack and complete the setup process Remove the 6 front most cover screws on each side panel of the amplifier and attach rack ears as shown 2 Dust Filter Insert the dust filter into the fan grille before attaching the fan grille to the amplifier Filter Maintenance Dust filters are provided with the M Class amplifier to reduce the build up of dust on the heatsinks Periodic cleaning should be done when there is a noticeable build up of dust on the filters To clean the filters remove them from the grilles and wash vacuum or tap them out
10. 0 M450 and M300 the M Class provides 2 channel operation at 600W 450W and 300W per channel into 4 ohm loads Single channel 70V Mono operation capacities are 1200W 900W and 600W Along with being powerful these amplifiers are also compact using up only 2 rack spaces 3 1 2 in a standard 19 rack Reliability Driven by a conservatively rated toroidal power transformer these amplifiers are built for solid performance with low distortion and a high slew rate Output module circuitry is located away from input module circuitry minimizing noise and ground loops The amplifiers require little maintenance and cleaning as internal electron ic components are located outside of the forced air stream flow Front mounted fan filters provide easy removal and cleaning M Class amplifers have a variety of electronic protection circuits including overcurrent DC voltage and ther mal circuits A special Clip Limiting circuit continuously monitors the amount of distortion in the output signal and reduces input levels as the amplifier approaches clipping Back Slope Bogen s unique voltage stabilization circuitry regulates the AC energy supplied to the power toroid This improves both system performance and reliability despite varying AC supply conditions An energy conserving sleep mode defeatable with instant on return signal operation reduces wasted heat production in paging systems with intermittent use In addition large output heatsinks an
11. Lo Cut A Summing Summing Filter 70V Mono Bridging Speaker Circuit Output fe Control Control B Control B Low Imp Speaker Output B AmpB Pre EQ Effects Post EQ Post E Out Loop Out Prud bes Out a 70V Mono Mode Block Diagram Dual Mono Mode Block Diagram Dual Mono Mode Placing the 3 position switch to its center position puts the amplifier in the Dual Mono mode of operation This mode is similar to the 70V Mono mode except that the amplifier supplies two channels of low impedance amplification in this mode see Dual Mono Mode Block Diagram This mode still INN mixes the input signal from the different modules but a Channel Balance control is provided to adjust the output DUAL mono O levels of one channel against the other see the section on Channel Balance It is important in this mode to set the assignment jumpers on the two input modules so that their outputs are on different audio buses see the section on Audio Buses Speakers must be low impedance type not 70V type Audio Buses The M Class amplifier contains two separate audio buses The A bus level is adjusted by the A level control on the front of the unit and the B bus is adjusted by the B Level control Most Bogen modules provide a means to assign their output to either or both of the audio buses The instructions that accompany the mod ules will describe the jumper settings for these assignments When using the M Class amplifier in either the 70V Mono
12. M Class Amplifier M300 M450 amp M600 Models Installation and Use Manual 2001 Bogen Communications Inc All rights reserved 54 2037 01R2 0109 Downloaded from http www guardianalarms net Notice Every effort was made to ensure that the information in this guide was complete and accurate at the time of printing However information is subject to change Important Safety Information WARNING To Reduce The Risk of Fire Or Electric Shock Do Not Expose This Apparatus To Rain Or Moisture Always follow these basic safety precautions when installing and using the unit Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with dry cloth MO UT RTO Hy dance with the manufacturer s instructions 8 Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 9 Do not defeat the safety 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 wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet 10 Protect the power cord from being walked on or pinched particularly at plugs convenience rece
13. Promptly replace them Caution The fan blades are accessible when the grille cover and filter are removed Be careful not to place your finger or other objects into the fan 3 Fan Grille To insert or replace the grilles first insert the tabs on the wider end of the grille in to the notches in the front center casting Snap the other end of the grille in to the snap slots Check that the grille is securely in place To remove pry the end of the cover closest to the rack ears up until the snap tabs disengage 4 Knob Cover To protect the amplifier controls from casual tampering the volume level controls are concealed behind a removable cover The cover snaps into place with tabs at the top and bottom To remove the cover squeeze both ends of the cover then gently dislodge the top and then the bottom Be careful not to tip the top of the cover too far forward while removing or the snap in tabs could be damaged To replace simply snap it back into place 4 Installation Ventilation The M Class was designed to be placed on a table or rack mounted When rack mounting the amplifiers can be stacked one on top of the other for maximum use of the rack An open air space of at least 4 must be provided at the front air intakes of the amplifier and the rear exhaust must have at least 4 between itself and obstructions to ensure adequate cooling This applies to both rack and table mounted amplifiers Care should also be taken to ensure th
14. Q POSTEQ The Post EQ Output Feed provides a signal that has been affected by the external signal processing equipment and lo cut filter Depending on the application it may be more desirable to use the externally processed signal rather than the raw version of the signal Modes of Operation Stereo Mode Two different output feeds are provided that can supply signal to other amplifiers and audio equipment Both outputs are designed to feed high impedance unbalanced inputs of external equipment The outputs are also quasi balanced for better noise immunity but connection lengths for these outputs should still be kept as short as possible The Pre EQ Output Feed provides the signal before any external signal processing effects it Placing the 3 position switch to its left most position puts the amplifier in the stereo mode of operation The amplifier supplies two independent channels of low impedance amplification in this mode see Stereo Mode Block Diagram These channels can be used to supply left and right audio for stereo installations of a 2 separate zones of amplification with different audio programs When using the supplied BAL1S input module in this mode the input applied to the A input will be controlled by the A level control and the output will be available on the A channel speaker terminals Likewise for the B channel When using other modules there are jumper set tings that allow those modules to apply signal to
15. The front level controls determine the mix of the two input module signals They do not control the volume level of each amplifier in these modes Essentially the volume level of both amp channels is fixed at maximum and the overall level of the mixed input module signals determine the output volume level To increase the overall volume of the ampli fier output turn up both front panel controls by the same amount This increases the signal level of each mod ule s input into the amplifier while keeping the mix the same Similarly turn down both controls to the same knob position to reduce the overall output volume from the amplifier Sleep Mode Defeat The M Class amplifier includes a sleep mode feature that o greatly reduces the power consumption of the amplifier after it has been idle for more than 3 minutes Any audio activity present at the input will wake the amplifier up instantaneously so that there is no loss of audio A sleep mode switch located in the upper right hand corner of the module bay can be set to activate or deactivate this feature using a thin flat bladed screwdriver If a module is inserted in the right bay turn off the power and remove the module before proceeding If the sleep feature is desired make sure the switch is in the down position If the sleep feature is not desired make sure the switch is in the up position o Sleep Defeat Sleep Mode Channel Balance Channel Balance only works in the
16. applicable as appropriate Adjust ducking control on MAX1R for desired level Adjust Gate controls of TEL1S for optimum paging control 13 Troubleshooting Status LED is off Status LED is green Signal LED is off Amplifier not plugged in AC outlet dead Power switch off Breaker power switch tripped Turn off then turn back on Level controls turned down No signal from source Input module jumpers in wrong bus configuration if available Status LED is green Signal LED is green Clip Limit LED is off 70V mono connections on amplifier incorrect Poor broken speaker wiring Defective speakers Status LED is green Signal LED is green Clip Limit LED is off Input signal level too high Poor speaker connections Lo cut switch set to Flat 70V mono system only Status LED is green Signal LED is green Clip Limit LED is off Status LED is red green cycling Lo cut switch setting Speaker wiring phasing Module bass control setting if available DC level at signal input Load impedance too low Amplifier speaker output is short circuited Amplifier too hot check for proper ventilation clearances Status LED is green Signal LED is green Poor electrical connections at input Input cable routed near AC cables power transformer or other EMI radiating devices Electrically noisy devices operating on the same AC circuit Po
17. at the front intake air is not considerably warmer than the ambient air temperature Mount the amplifiers low in the rack so that heat dissipation from other equipment does not warm the amplifier s intake air Rack Mounting Rack ears are included with the amplifier to allow mounting in 19 racks Attach the rack ears as shown in Installation Components section If any feet have been attached to the bottom of the amplifier remove them Load the amplifier into the rack and secure it to the rack with appropriate hardware not included Table Mounting Feet are provided with the amplifier to allow it to be placed on a tabletop Attach the included feet to the bot tom of the amplifier as shown Attachment of the rack ears to the unit is optional and purely aesthetic Installation Module Installation Installation Two input module bays are available to accept various Bogen input modules thereby allowing users to customize the amplifier to suit the needs of the installation First read the instructions included with the module and make the desired jumper setting changes before installing the module The input modules are installed by simply slid ing them along the card guides inside the module bays until the faceplate firmly sits against the M Class chas sis then use the two screws supplied with the module to secure it to the chassis Card Guides Typical Module ae BAL1S Modu
18. d dual independently controlled high output variable speed fans provide superior cooling and quiet operation while reducing dust accumulation Bogen s M Class amplifiers are enclosed in a heavy gauge steel chassis which prevents mechanical damage to the unit s internal components even if the unit is subjected to rough handling and excessive portable installa tions The control knobs are located in a recessed section of the cast aluminum front panel to reduce the like lihood of mishandling and damage The angled design of the amplifier s front panel allows easy finger access to the front knob cover when the amplifiers are stacked tightly in a rack Package Contents M Class Amplifier 2 Rack Ears 2 Filters and Grilles Instruction Manual Control Knob Cover BAL1S Input Module pre installed 4 Rubber Feet amp Screws status signal clip limit 3s M CLASS AMPLIFIER M Class Front Panel 1 Status Indicators The Status LED is a multi purpose indicator Green Amplifier is on and operating normally Amber Amplifier is in low power consumption Sleep Mode Red Amplifier has protecte
19. d itself due to a fault condition One for each channel 2 Signal Indicators Illuminates green when signal is present at the input One for each channel 3 Clip Limit Indicators The amplifier limits currents and this indicator illuminates amber when there are excessive signal levels or very low impedance output loads A built in Clip Limiting circuit activates and reduces input signal levels when out put distortion exceeds a few percent One for each channel 4 Power Switch Circuit Breaker Controls AC power to the amplifier and also works as a circuit breaker If the circuit breaker trips push it to the OFF position O and then to the ON position 1 5 Fan Grilles Removable fan grilles are provided to allow access to the dust filters for cleaning 6 Volume Controls Detented 40 position knobs are protected by a recess from mechanical damage Knob Cover not shown Removable cover protects the volume controls from casual tampering or brushing n 2E Model M600 CLASS2Y a ae a ws OB ananhannnnnn U U U Load Rati U U VUUUUUUUUUU Lun Qu ULUJUULUUUULUUU VY 0 00 6 0 0 0 n nnn 8Q 400WICh DE NANAAAAAAAAAANANA GROUND m IS
20. each mod ule for specific connection and setup information DDAIDD D 6 6 BAL1S Jumpers Module Priority Bogen input modules allow for up to 4 levels of priority Each module except the BAL1S which comes stan dard with the amplifier can both be muted by higher priority modules and mute lower priority modules The priority level of the module is set by the position of 2 jumpers on each module Note Even though 4 priority levels are available on the Bogen input modules only two levels can be used with the M Class since it only accepts 2 modules It does not matter which priority level is set on the module only that the intended higher priority module be set to some priority level that is higher than the intended lower priority module However Bogen recommends using Priority Level 1 the highest available for the higher priority module and Priority Level 2 for the lower priority module Module Controls Each input module type has a number of controls such as Gain Bass and Treble These controls affect the oper ation of the amplifier as much as the ones mounted on the amp Be sure to read the instructions with each module and be aware of its control setting when adjusting the overall operation of the amplifier 11 Application Examples Application 1 Simple 1 Zone 70V Mono telephone paging system with background music Background music
21. en tn ER A 10 Audio BUSES ui at Ar a tm ur cnet aaae atina iania 10 Modules A822 inialiiHisik 11 Standard Input Module niente ient 11 Qtlier Modules ota ct ia 11 Module Priority nn eR e RR Ee ete Module Controls mM APPLICATIONS eoni i E E AE OAA TROUBLESHOOTING 22urr2000r0000000000000000000000000000000nn000snnnssnensonnessnnssssnnnsssnnene SPECIFICATIONS Introduction Bogen s M Class amplifiers deliver on what professional sound installers need most Flexibility Power and Reliability Flexibility Power The M Class allows for the installation of up to 2 input modules accepting inputs from microphones telephone systems stereo sources mono sources or daisy chaining of amplifiers Each M Class model comes standard with a single professional quality stereo high impedance balanced input module BAL1S The M Class has three operating modes to meet different installation needs Stereo Dual Mono or 70V Mono Front panel controls allow independent operation of each power amplifier channel in stereo mode In either 70V Mono or Dual Mono modes the inputs form a 2 1 mixer with the front panel controls setting the signal levels from each input Prioritized input modules and 2 1 mixer operation allow the M Class to supply the front end signal processing required in paging systems and the power to cover any size installation With three different models M60
22. le Priority Jumper The BAL1S module that comes standard and pre installed with the M Class differs in priority capability from other Bogen input modules This module is always the lowest priority since it is incapable of muting other mod ules It can also be set so that it does not respond to muting from other modules and is therefore always on for use in mixing applications The module jumpers should be set prior to installing the module The sleep switch should be set to the desired position prior to installation of the right module see Operation Sleep Mode Defeat Speakers Low Impedance Speaker Connections When the amplifier is set to either the stereo mode or the Dual Mono mode see Operation section low impedance speakers can be connected to either the A or B speaker output terminals The amplifier is designed to work into speaker load impedances as low as 3 2 ohms The speaker terminals can accept up to a 10 spade lug and have inte o ggg de sk gral clamping plates which make wiring easier The polarity of each set of speaker outputs A amp B is indicated with a an sign Use these indicators to ensure that the phasing of the speakers are correct Do not ground the output of either set of outputs Doing so will cause the amplifier to go into protect mode shut ting down operation of the affected channel Note The and indicators are mirrored on A and B output
23. or equipment grounding Ensure that all AC safety grounds are connected Make sure that all components in audio chain are tied to the same ground 14 Specifications Power Output 70V mono 1200W 4 ohms 900W 5 5 ohms 600W 8 ohms 4 ohm 600W per channel 450W per channel 300W per channel 8 ohm 400W per channel 300W per channel 200W per channel Input Sensitivity 1 225V 1 06V 0 866V i 109dB ref 8 ohms FP 106dB ref 8 ohms EP 103dB ref 8 ohms EP Class of Operation AB I Product Weight 46 Ibs 44 Ibs 41 Ibs Connectors AC Power 20A line cord 15A line cord 15A line cord Output 5 pin touch proof Barrier Strip RCA Pre amp Post EQ Output Power Bandwidth 20 40kHz 5 THD less than 02 Load Impedance 4 8 ohms 70V Minimum Load Impedance Stereo 3 2 ohms Frequency Response 1 watt 20 20KHz 0 25dB Output Regulation 1kHz direct 0 5dB 8 ohms 1kHz bridged 1 5dB 70V BAL1S Standard other modular input types available AC Input Voltage Range 95 130V AC 60 Hz Indicators Status On Protect Sleep Clip Limit Signal Temperature Range 15 to 105 degrees F Forced Air Variable Speed Fan Physical Dimensions W x H x D 17 x 3 5 x 16 RF DC Low frequency Thermal Low impedance Circuit Breaker Short Circuit Special Features Sleep Mode Back Slope regulation Stereo Dual Mono 70V Mono Operation Toroidal Power Transformer Both channels driven at nominal line voltage 120V AC 60Hz 15
24. plays through the system when no page is being made During a telephone page the background music mutes to a predetermined level and the telephone page is heard When the page is complete the background music fades back to its previous level Module Bus Assignment Priority Setting TEL1S Bus A only Priority 1 MAX1R Bus B only Priority 2 Mode of Operation 70V Mono Amplifier Adjustments Volume of the telephone page is adjusted by the A Level Control background music level is adjusted by the B Level Control Set the Lo Cut switch to 65Hz Module Adjustments Adjust Gain to make each source s input level similar Adjust Bass amp Treble where applicable to your preference Adjust ducking control on MAXIR for desired level Adjust Gate controls of TEL1S for optimum paging control Application 2 Stereo low impedance music system with microphone override Stereo program material plays into low impedance speakers When the microphone becomes active the stereo music is muted to a predetermined level and the microphone is easily heard When the microphone signal stops the music fades back to its previous level Module Bus Assignment Priority Setting MIC1X Bus A amp B Priority 1 BAL1S Not assignable MUTE Included standard with M Class amplifiers Mode of Operation Stereo Amplifier Adjustments Stereo music program wired to BAL1S inputs Each stereo channel volume is controlled by the associated front level
25. ptacles and the point where they exit from the apparatus 11 Only use attachments accessories specified by the manufac turer 12 Unplug this apparatus during lightning storms or when unused for long periods of time 13 Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as 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 Domestic and International Listings UL and C UL Listed DO NOT block any ventilation openings Install in accor IMPORTANT CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION TO PREVENT THE RISK OF ELEC TRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL The lightning flash with arrow head symbol within an equilat eral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magni tude to constitute a risk of elec tric shock to persons The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instruc tions in the literature accompa nying the appliance Contents Page INTRODUCTION
26. s Be sure to make the correct connections Earth Ground Terminal The earth ground terminal is provided as a convenient means to con nect to the amplifier s chassis AC ground if necessary DO NOT con nect the earth ground terminal to the terminals of either output No damage will occur if this is done but the amplifier will go into pro tect mode and shut down the effected channel 70V Transformer Coupled Speakers The 70V speaker output terminals are only usable when the amplifier is in the 70V Mono mode see Operation section In this mode both channels are bridged into a single mono channel Use only speakers that are designed to work with 70V audio systems when connecting to these terminals The speaker terminals can accept up to a 10 ring lug and have integral clamping plates which make wiring easier The 70V output terminals are indicated by a yellow field above them The polarity of the output terminals is indicated for speaker phasing pur poses These output terminals must float and cannot be referenced to amp d amp l l cd d Ole pA ow Field 2 WIRIN o earth ground so if they become ground ed the amplifier will go into protect mode shutting down operation of the amplifier even though no damage to the amplifier will occur BAL 1S Module Input Balanced Input Connections Balanced inp
27. the A or B channels or both See the application examples for more information on how to use the two audio buses Level Control A Power AmpA Low Imp Speaker Output A Power Amp B PreEQ Effects Low Imp Speaker Output B Out Loop Out Stereo Mode Block Diagram Summing Control B 70V Mono Mode Placing the 3 position switch to its right most position puts the amplifier in the 70V Mono mode of operation The amplifier supplies a single channel of amplification in this mode see 70V Mono Mode Block Diagram This mode also mixes the signals from each input module into a mono pro mm gram Input signals of modules that are assigned to the A MONO bus are controlled by the A level control on the front of the unit and likewise for modules whose outputs are assigned to the B bus By assigning each module to a different bus a 2 1 mixer is formed with the front mount ed level controls adjusting the mix Additionally one module can be set to mute the other when it is active thereby providing an effective paging system see the section on Module Priority It is important in this mode to set the assignment jumpers on the two input modules so that their outputs are on different audio buses see the section on Audio Buses Speakers must be correct for 70V operation See section on 70V Transformer Coupled Speakers Level Control A Level Control A Low Imp Speaker Output Mono Mono
28. ut connections are used when the source device pro Source Equipment BAL1S Module vides a balanced output signal signal and ground G This type of connection is desirable when operating in electrically noisy environments where long input cable runs are needed or to ensure the lowest noise operation If compatible with the source device this type of connection is recommended Unbalanced Input Connections DDD When the source device provides only an unbalanced output _ Source Equipment BAL1S Module signal and ground the BAL1S input should be wired with input shorted to ground G The unbalanced signal s shield wire is connected to BAL1S ground and the signal hot wire is connected to the terminal Since unbalanced connections do not provide the same amount of noise immunity that a bal _ Boalt Jumper wire anced connection does the connection distances should be made as short as possible Controls amp Connectors Level Controls The front mounted level controls act differently depending on the mode of operation In the stereo mode each level control determines the volume of the corresponding amplifier channel as in a typical amplifier In the 70V Mono and Dual Mono modes the controls have a different function and determine the mix of the signal levels from the different input modules input modules can be assigned to either the A or B chan nel by the jumpers on the module
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