Dynacord DPA 4245 Stereo Amplifier User Manual
Contents
1. Extension Kits For The DPA 4245 And The DPA 4260 NRS 90208 balanced input input transformer for a single channel NRS 90235 1 pair of rack mount ears 26 Technical Specifications DPA 4245 DPA 4260 Amplifier at rated conditions both channels driven direct outputs with 8Q loads isolated outputs with rated load and voltage unless otherwise specified DUAL MODE Output Definition Load impedance or rated output voltage Rated Load Impedance isolated outputs only Maximum Midband Output Power THD 1 1kHz Maximum Midband Output Voltage THD 1 1kHz RMS rated load Rated Output Power THD lt 0 2 45Hz 20kHz gt 10min according IEC 268 3 Rated Output Voltage THD lt 0 2 45Hz 20kHz Maximum RMS Voltage Swing THD 1 1kHz no load connected Frequency Response 3dB ref 1kHz LO Cut Filter 18dB octave 45Hz HI Cut Filter 12dB octave 30kHz Voltage Gain at 1 kHz Input Sensitivity and Impedance at rated condition Slew Rate Power Bandwith THD 1 ref 1kHz half power rated load impedance THD at rated output power MBW 80k z 1 kHz IMD SMPTE 60 Hz 7 kHz DIM30 3 15 kHz 15 kHz Crosstalk ref 1kKHz at rated output power Input Impedance 20Hz 20 kHz balanced Damping Factor at 100Hz 1kHz direct outputs only Insertion Loss isolated outputs only Signal to Noise Ratio Rated output voltage to noise A weighted DPA4245 DPA4260 Direct Output Isolated Out2. OFF ATTENTION REMPLACER PAR UN FUSIBLE DE MEME TYPE APPLIANCE TO RAIN OR MOISTUR COMME DALE AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR DYNACORD DPA 4260 275 MADE IN GERMANY AUDIO TRANSFORMER OUTPUTS A B p BRIDGED p 100v 70v 70V 25V arov pee roves ORNS BRIDGED MODE 42 Morva BRIDGED Oo OUTPUT WIRING MUST BE CLASS 1 NO USER SERVIGEABLE PARTS INSIDE REFER SERVICING TO QUA IFIED SERVICE PERSONNEL Q PIN 1 SHIELD PIN2 a PIN3 b Inputs INPUT CHANNEL A amp B With an input sensitivity of 775 mV 0 dBu and an input impedance of 20 k ohms the electronically balanced inputs INPUT CHANNEL A amp B are meant for the connection of control amplifiers audio controllers mixing consoles etc Peripheral pieces of audio equipment are either connected via the XLR type input connectors or using the parallel linked binding posts For the latter option you can utilize the supplied screw plugs Thus carrying the audio signals through to feed additional power amplifiers can be conveni ently achieved without the need for special split cables The XLR type input connectors pin assignment is in accordance to the IEC 268 standard In case the controlling device does not supply balanced output connectors it is also possible to configure the connectors for unbalanced operation Therefore the common grou
3. ries OS meo OO O AEN O oO otic Oo wa on ise ne oO O c odo of Ort Se mee OO OOOO ol O Oc1a2 c86 OJO OdEO2 oT cies 1700 ote cy a e 1 Q 10k 31260 G 8 eto ate 10 Orie Level Control dB scaled rotary controls for adjusting the power amplifier s overall ampli fication This control should be positioned between the 0 dB and the 6 dB marks to prevent distortion in source devices The labeling indicates the actual attenuation applied to the internal specified factor of amplification Input Routing If the switch is set to parallel mono the input connectors CHANNEL A and CHANNEL B are electrically linked for direct parallel operation With only a single audio signal source connected both channels are driven while their volume levels are still individually controlled via the level controls A and B If the switch is set to its dual stereo position channels A and B are separately amplified two channel or stereo mode The loudspeaker cables are connected to the power amplifier through high performance binding posts with the necessary screw plugs being supplied For connection purposes it is possible to remove the 12 pole terminal plug Cables with a maximum diameter of 2 5 mm2 can be utilized To provide fle
4. Audio limiters High temperature DC HF Back EMF Peak current limiters Inrush current limiters Turn on delay Output Transformer Saturation Protection Input Connectors Euro style 3pin detachable or XLR Output Connectors Euro style 12pin detachable covered Cooling Front to Rear 3 stage fans Regulations The appliances are in accordance with EN60065 EN50081 1 EN 50082 1 Safety Class Operating Temperature Range 5 40 C Mounting Depht with Connectors 437 mm Mounting Depht without Connectors 377 mm Dimensions W x H x D 483mm x 132 5mm x 382mm Weight net 20 5 kg 22 5kg 28
5. Mains Operation And Leakage Power The mains power consumption as well as the leakage power is stated for driving the power amplifier at different levels All the values were measured at nominal load via the 100 V output with two channels driven The shown values differ only slightly when the appliance is operated at different nominal output voltages or in the Direct Out mode es a fae tng UmainsiV Imains A Pmains VA Pmains W Pout W Py W BTU hr DPA 4245 idling 230V 0 34 78 47 47 160 normal operation 10 dB 230V 2 76 635 490 70 420 1430 alarm 3 dB 230V 5 54 1274 1040 352 688 2347 nominal conditions 230V 7 45 1714 1420 700 720 2456 DPA 4260 idling 230V 0 57 131 80 80 273 normal operation 10 dB 230V 3 66 842 655 101 554 1890 alarm 3 dB 230V 7 34 1688 1370 506 864 2948 nominal conditions 230V 9 86 2268 1900 1000 900 3070 initial current inrush for both models lt 38 A Pmains VA apparent power Umains mains Pmains W active power Pout W output power Pv W leakage power 1BTU 1055 06 W s Fuses location pos utilization value dimensions standard rear panel DPA 4245 mains fuse 230V AC T8A 250V 5 x 20 mm IEC 127 rear panel DPA 4260 mains fuse 230V AC T10A 250V 5 x 20 mm IEC 127 print 84171 1 F1 power supply T1A 250V 5x 20 mm IEC 127 print 84171 1 F2 power supply T1A 250V 5 x 20 mm IEC 127
6. Providing correct connection and with an external power supply being present the POWER ON indicator will light and the power amplifier is ready for operation The mains switch POWER on the rear of the appliance is meant for service and maintenance purposes only Through bridging the mains switching relay this option provides the possibility to operate the amplifier without an external 24 V power supply connected Caution The mains switch POWER on the rear of the appliance is only meant for maintenance Remotely switching off the device is not possible when the POWER switch is engaged The DPA Series power amplifiers employ power on switching delays of approximately 2 seconds 230V 50 60 Hz 870 WATTS MAINS FUSE N CIRCUIT 1 TO T10A L 250V oO a CHASSIS SWITCH A GROUNDED AN E nger B CHANNEL INPUTS CHANNEL A INPUTS POWER LEVEL PARALLEL LEVEL 1200WI8 2 at SSSSSSSSSSSS 10070 0 DIRECT OUTPUTS O 70 1 ISOLATED OUTPUTS st 25V x os RONG 6s fda 54 Ee C LEI KO T IO mii S a BE Ej O i OQ useranno SEE OPERATING MANUAL ed ae D CAUTION FOR CONTINUED PROTECTION AGANST RISK OF FIRE WARNING TOREDUCE THE RISK OF FIRE 24V ON REPLACE WITH SAME TYPE AND VALUE FUSE INDICATED OR ELECTRIC SHOCK DO NOT EXPOSE THIS OV
7. apparatus that produce heat Only use attachments accessories specified by the manufacturer 10 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 For US and CANADA only Do not defeat the safety purpose of the grounding type plug A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety When the provided plug does not fit into your outlet consult an electrican for replacement of the absolete outlet NOoOPhoON o IMPORTANT SERVICE INSTRUCTIONS CAUTION These servicing instructions are for use by qualified personnel only To reduce the risk of electric shock do not perform any servicing other than that contained in the Operating Instructions unless you are qualified to do so Refer all servicing to qualified service personnel 1 Security regulations as stated in the EN 60065 VDE 0860 IEC 65 and the CSA E65 94 have to be obeyed when servicing the appliance 2 Use of a mains separator transformer is mandatory during maintenance while the appliance is opened needs to be operated and is connected to the mains 3 Switch off the power before retrofitting any extensions cha
8. lt 2 DYNACORD PRO MAT RIDS lt OWNER S MANUAL SYS T EMA DPA 4245 DPA 4260 POWER AMPLIFIER DYNACORD DPA 4245 2 x450 WATTS POWER AMPLIFIER Features e 2 x 450 watts output power capacity DPA 4245 e 2 x 600 watts output power capacity DPA 4260 e floating 100 V 70 V 25 V power outputs isolated outputs e low impedance outputs direct outputs e bridged mode operation switchable e all outputs are protected against idling and short circuit e mains supply 230 V AC 50 60 Hz e POWER REMOTE function e service mains switch e active ventilation via 2 temperature controlled DC fans e electronically balanced inputs e routing switch for parallel linked operation e input gain controls e integrated audio limiters e power on switching noise suppression e protection circuitry DC HF Back EMF output voltage overload limiters initial inrush current limiter output peak current limiter e 18 dB oct LO cut filter at 45 Hz e SIGNAL and LIMIT indication for optical monitoring e thermal overload protection for the heat sink and the internal power supply with PROTECT function e inputs transformers for balanced floating operation are optionally available e XLR type and binding post clamping input connectors e 19 frame size 3 HU CONTENTS DeSCrIPUON ssrA tna pane eke A A a a nthe Ee edie a 17 Installation Notesi i e iui i ee tind ieee nce a We vee era ae die wd wae Wee oe tac A bier a 18 Rear View a desea
9. tale teense anes e E aa Bd Gun A E aa ilaa 4oa OAE D E 19 INPULS 2 a anr a A A O a EE eo eRe Pane ee eee 19 OUTPUTS n AAE Sorar aE T EA EEND EAA nE E E aS ALAE 20 SP CIICATIONS esses ea e Teste Shes bese beaded E A a a E E a Bee Sa IAA 27 Block Diagrami ai mi a a a a kde ee ete woh pee eae 43 DIMENSIONS EEE E E EEE A EE N EEEE EE aa as 44 Warranty aiea eaa a tE A EL a Rt ah a E E ee wee E N a E eo dine a As 48 IMPORTANT SAFETY INSTRUCTIONS The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated CAUTION dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons WARNING To REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK The exclamation point within an equilateral triangle is intended to DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE alert the user to the presence of important operating and maintan AVIS Risque DE CHOC ELECTRIQUE NE PAS OUVRR ce servicing instructions in the literature accompanying the appliance Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with a damp cloth Do not block any of the ventilation openings Install in accordance with the manufactures instructions Do not install near any heat sources such as radiators heat registers stoves or other
10. 0 V as well as with a direct output with doubled nominal output voltage If the BRIDGED MODE switch is engaged the audio input signal has to be fed via the CHANNEL A input while the CHANNEL B input is without function The signal is internally inverted and the power amplifier stage B is driven by that inverted signal The power amplifier stage A is still driven by the unaltered incoming audio signal Bridged mode operation is possible with using the isolated and or the direct outputs When using the isolated outputs bridging the binding posts of channels A and B is mandatory using short cables with suitable diameter 1 5 mm 2 5 mm 2 Careful consideration of the loudspeaker systems correct connection is important in preventing phase correlation problems Channel A carries the signal in phase and therefore has to be connected to the pole of the correspondent loudspeaker system while the loudspeakers pole has to be connected to the output connector of channel B The output voltage of each power amplifier stage A amp B is present at the binding post strip but utilization is not recommended because of the negative correlation AUDIO TRANSFORMER OUTPUTS B LOW IMPEDANCE A 100V aes 100V 1200W 8 Q B DUAL A 600W 4Q SS 55555555OO E 70 O DIRECT OUTPUTS 0 7 DIRECT OUTPUTS 0 701 om SOURED OUTPUTS Se BA BRIDGED 50V figure output connection in 50 V bridged mode opera
11. ails or optionally available rack mount ears NRS 90235 112733 to prevent bending of the appliance s front panel 15 12 Note For maintained trouble free operation of the appliance the maximum admissible ambient temperature of 40 C is not to be exceeded The amplifier has to be protected from water drops or splashes direct sunlight high ambient temperatures and the direct radiation of heat sources high humidity and moisture heavy dust massive vibrations Moving the amplifier from a cold into a warm environment can result in the occurrence of condensation on inner parts Operating the appliance is only permissible after it has accommodated to the altered temperature approximately after one hour Should any foreign solid parts or liquids inadvertently intrude the enclosure immediately unplug the device from the power source and have it checked at a DYNACORD service center before further use Cleaning the appliance should not be performed using chemical solvents or sprays as this might damage the finish and could even cause hazard fire Before The First Operation Before switching the amplifiers power on the included mains cord has to be connected to a 230 V 50 60 Hz wall outlet On the appliance itself the cord has to be connected to the 3 pole mains socket To remotely start the amplifier it is necessary to connect an external 24 V power source to the terminal strip POWER REMOTE
12. ansformers of power amplifiers that do not provide audio signal limiters into saturation resulting in nasty distortion and high thermal load of the power amplification stage The audio signal limiters of the DPA Series power amplifiers are designed to quickly identify the occurring saturation of the core of an output transformer The level is dynamically reduced to a value that stays just below the point of where the saturation starts The Limit LEDs on the front panel indicate that the limiters have been activated Despite the protection that is provided through the audio signal limiters the Limit LEDs should not light over a longer period of time Please locate the cause of the faulty operation e g lower the LF EQ setting at the connected mixing console when at the same time the input level at the power amplifier is approximately 10 dB above the nominal input level The DPA Series power amplifiers employ integrated Lo Cut filters at 45 Hz with 18 dB oct for each channel They protect the loudspeaker systems that are connected via output transformers against low frequency audio signals which depending on the quality and size of the involved transformers could lead to problems with core saturation In addition to the 45 Hz Lo Cut filters the frequency response of the DPA Series power amplifiers top margin is set by 30 kHz Hi Cut filters with 12 dB oct preventing unwanted high frequency audio signals from being present at the outputs 25
13. e mains switch POWER on the rear of the appliance bridges the mains relay It is meant for service purposes only This allows to operate the power amplifier without the presence of an external 24 V power source The current consumption at the POWER REMOTE input is approximately 25 mA Limit Indicator The indicator lights whenever the integrated limiter is activated While short blinking means no problem the continuously lit LED indicates that the volume level needs to be reduced to prevent the connected loudspeaker systems from being damaged by overload The audio limiters are capable of controlling overdrive levels of up to 20 dB Most other power amplifiers without integrated limiters begin to clip genera ting nasty distortion that not only attacks your ears but also lead to damaging the connected loudspeaker systems by overload The limiters are activated only in case of the occurrence of non linear conditions within the power amplifier e g signal clipping at the operation voltage limit The limiters do not affect the power amplifiers overall dynamic range Signal Indicator This indicator is lit when the audio signal exceeds 30 dB In case short cir cuits resulting from broken loudspeaker cables are detected or one of the power amplifiers protection circuits is activated the signal indicator is dimmed PROTECT The PROTECT LED lights whenever one of the power amplifier s protection circuits thermal overload RF DC Bac
14. er amplifiers power on directly Using the provided power remote input remote start is also possible Consistent thermal stability of the power amplifiers is obtained through extremely silent running fans which are automatically switched stepwise depending on the amplifiers operation mode The front to rear air circulation guarantees trouble free operation in rack shelf enclosures of any size Several other features of the DPA Series power amplifiers are revealed within this owner s manual Therefore please take the time to carefully and entirely read the provided information Installation Notes Generally it is important to install the power amplifier in a way that ensures unhindered front to rear air circulation When installing the power amplifier in a closed rack shelf system please make sure that adequate air flow is guaranteed The space between the rear panel of the amplifier and the inner wall of the rack case has to be at least 60 mm x 330 mm A free space of at least 100 mm above the rack shelf system is needed to provide sufficient air circulation Since during operation the temperature inside the rack system could easily rise up to 40 C the maximum allowable ambient temperatures of the rest of the incorporated modules and appliances within a specific rack shelf system have to be taken into careful consideration When mounting the power amplifier insi de of a closed rack system it is recom mended to use special rack r
15. he overall power consumption of the connected loudspeaker systems or lines does not exceed the output power capacity of the power amplifier Example If a loudspeaker system with 8 ohms and a nominal power handling capacity of 300 watts is connected to the DPA 4260 channel A Direct Output this equals exactly half of the power amplifier s output power capacity since the minimal load impedance for each channel is 4 ohms That leaves the possibility to utilizes exactly half of the nominal output power capacity of the channel A 100 V output which in this example equals 500 watts 2 250 watts to supply a split loudspeaker line The total impedance of the loudspeaker line has not to decline 20 ohms 2 40 ohms Pa TRANSFORMER OUTPUTS LOW IMPEDANCE LOW IMPEDANCE A 100V BRIDGED 100V 1200W 8 Q 25V 70V OOS 70V 25V B DUAL A 600W 4e Ne EE 70 0 DIRECT OUTRUTS ISOLATED OUTPUTS 80 300W figure example configuration DPA 4260 channel A in mixed mode 22 Bridged Mode Doubling the power amplifier s output power is accomplished by engaging bridged mode operation where the two power amplifier output stages are linked for push pull operation In other words a monaural power amplifier is created offering double the output voltage and double the output power capacity of a single channel As a result you are provided with floating 50 V 140 V and 20
16. ion DPA 4260 with 100 V loudspeaker systems maximum load using 30 W 100 V and 60 W 100 V loudspeaker systems 21 Power Outputs Isolated Outputs 25 V The floating 25 V output is mainly used for driving low impedance loudspeaker systems 4 16 ohms Because of the effect of line attenuation the distance between power amplifier and loudspeaker systems should not exceed 50 meters It is further important that the total impedance of the entire loudspeaker network does not decline the nominal load impedance of the 25 V output For details on the nominal load impedance of the 25 V output please also refer to the specifications in the appendix AUDIO TRANSFORMER OUTPUTS B LOW IMPEDANCE A 100V 100V BRIDGED 1200W 8 Q B DUAL A 600W 000000000E IIIA CLPY 16070 0 DIRECT OUTPUTS 0 70 100 ISOLATED OUTPUTS x 12x16 Q figure example configuration DPA 4260 with 8 ohms and 16 ohms loudspeaker systems at maximum load Power Outputs DIRECT OUTPUTS In addition to the output transformer equipped outputs and for driving low impedance high performance loudspeaker systems the power amplifier s direct low impedance outputs are carried out as well offering a minimal load impedance of 4 ohms Each power amplifier channel is capable of simultaneously driving loads at the direct output and at the isolated output But it is of major importance that t
17. k EMF is activated In PROTECT mode all loudspeaker lines and output transformers are disconnected via relays and the power amplifiers audio inputs are short circuited to prevent the connected loudspeaker systems from being damaged When the power amplifier enters the PROTECT mode please examine first whether the appliance is overheated If this is the case the front and rear ventilation louvres are possibly covered the nominal load impedance has fallen below the specified minimum value or a short circuit occurred at the power output When switching the power amplifier on the PROTECT LED lights for appro ximately 2 seconds This is normal It signals that the protection circuitry is in working order Power ON Indicator This LED lights when the power amplifier is connected to the mains and its power switch is set to the ON position If the indicator does not light although the power amplifier is switched on the appliance is not connected to the mains or the primary fuse is blown 24 Protection Circuitry The DPA Series power amplifiers are equipped with extensive protection circuitry e initial current inrush limiter e power on delay e RF and DC protection e Back EMF protection e limiters for the audio signals e output peak current limiters e thermal overload of the heat sink e thermal overload of the mains transformer e output voltage overload limiters High level signals in the low frequency range can drive the output tr
18. lem Quick optical information on the power amplifiers momentary operational status is provided through easily readable LED indicators individually showing whether a channel is ready for operation a signal is present at the output if any of the limiter circuits and or one of the protection circuits has been activated The inputs are electronically balanced and carried out as XLRF type and as binding post clamping connectors as well Parallel linking the two connector types at the input provides the possibility to utilize the carried through signals to feed additional power amplifiers without the necessity for special split cab les Both inputs can be optionally retrofitted with input transformers Through Input Routing switches it is possible to configure the DPA Series power amplifiers for stereo parallel monaural or bridged mode operation The dB scaled level controls extremely precise and good to operate potentiometers are located on the rear of the appliances A Ground Lift switch which helps eliminating ground noise loops by separating the amplifier circuit ground from the common ground of the enclosure is also to be found on the rear panels Conveniently connecting the loudspeaker lines to the power amplifiers is provided through a binding post strip where all voltages 25 V 70 V 100 V and the low impedance output are present on individual screw clamp connectors The rear panel service mains switches allow turning the pow
19. ls hospitals shopping malls and super markets cruise ships and other similar applications Each power amplifier incorporates two high performance output transformers Next to 100 V 70 V and 25 V floating outputs the direct outputs provide the possibility to also drive loudspeaker systems with low impedance down to a minimum of 4 ohms Simultaneous operation of low impedance speaker systems and floating loudspeaker lines on a single output channel of the power amplifiers is possible as well The integrated 45 Hz LO cut filter with 18 dB oct slope protects the connected loudspeaker lines from unwanted ultra low frequencies Comparator circuitry constantly monitors the input and output signals of the power amplifiers and activates their internal limiters whenever non linear operation is encountered which reliably protects the connected loudspeaker systems against overload conditions and clipping saturation of the power supply transfor mers and overvoltage at the outputs The DPA Series power amplifiers transmission and sound qualities are absolutely superb The employed comprehensive dimensioned power supply units with low interfe rence toroidal transformers ensure that the stated nominal performance specifications are accomplished even in most demanding and critical installations Since the DPA Series power amplifiers do not employ V Foldback Limiter circuits operation on complex loads up to 90 phase angles is possible without a prob
20. mandatory Especially if a 100 V loudspeaker network is included in alarm system applications all security standards have to be in accordance to the security class 3 standard Before the first operation of the power amplifier the loudspeaker terminal strip has to be covered using the supplied protection cover Power Outputs Isolated Outputs 70 V and 100 V To reduce line attenuation effects when the distance between power amplifier and loudspeaker systems exceeds 50 meters it is recommended to employ loudspeaker systems with 100 V or 70 V line transformers which also allows conveniently distributing the output power to the individual loudspeaker systems It is possible to connect as many loudspeaker systems until the total power consumption of the loudspeaker network equals the nominal power handling capacity of the power amplifier while not declining the nominal load impedance of the power amplifier outputs For details on nominal power handling capacity and nominal load impedance of the amplifier s individual power outputs please refer to the specifications in the appendix AUDIO TRANSFORMER OUTPUTS B LOW IMPEDANCE A 100V BRIDGED r 100V 1200W 8 Q 25V 70V 70V 25V B DUAL A 600W 4e x S E E 100 70 O DIRECT OUTPUTS 0 70 100 ISOLATED OUTPUTS eed eee figure example configurat
21. nd pin 1 has to be connected to the input pin 3 The audio signal is now solely fed through the input pin 2 So to be able to entirely make use of all the advantages the electronically balanced input stage offers like the suppression of humming and interference noise it is beneficial to re establish balanced input connec tion whenever possible In case floating inputs are needed the inputs are ready to be retrofitted with input transformers one optional available extension kit NRS 90208 308840 per channel is necessary Instructions On How To Install NRS 90208 Extension Kits e unplug the power amplifier from the mains e detach all screws holding the cover plate of the appliance e lift and remove the cover plate e disconnect the flat wire cable of the printed board assembly 81340 1 e detach all screws holding the printed board assembly 81340 1 e remove the printed board assembly 81340 1 and unsolder the resistors R106 R109 e attach insulators to the input transformers according to the corespondent marks on the printed board assembly e re assemble the appliance by performing all steps described in the opposite order CN1Q0 3 figure block diagram input channel A INPUT ROUTING DUAL STEREO u m _ PARALLEL MONO Power Outputs A amp B CHANNEL A 81348AzZ1 354 701 Ve3ysenes R186 H1 BA Lt
22. nging the mains voltage or the output voltage 4 The minimum distance between parts carrying mains voltage and any accessible metal piece metal enclosure respectively between the mains poles has to be 3 mm and needs to be minded at all times The minimum distance between parts carrying mains voltage and any switches or breakers that are not connected to the mains secondary parts has to be 6 mm and needs to be minded at all times 5 Replacing special components that are marked in the circuit diagram using the security symbol Note is only permissible when using original parts Altering the circuitry without prior consent or advice is not legitimate 7 Any work security regulations that are applicable at the location where the appliance is being serviced have to be strictly obeyed This applies also to any regulations about the work place itself 8 All instructions concerning the handling of MOS circuits have to be observed D Note AN SAFETY COMPONENT HAS TO BE REPLACED WITH ORIGINAL PART ONLY 16 DESCRIPTION Especially designed for permanent installations the DPA Series power amplifiers offer performance con sistent and reliable operation of PA systems with 2 individual loudspeaker lines each Therefore DPA Series power amplifiers are most suitable for company intercom alarm and background music transmission installations in offices and commercial areas congregation and sport centers schools houses of worship hote
23. puts Direct Output Isolated Outputs 80 40 100V 70V 25V 8Q 40 100V 70V 25V 28 50 140 1 80 202 9 80 1 250 240W 450W 410W 400W 390W 330W 600W 590W 580W 570W 44V 42 4V 108V 74 8V 26 5V 51 3V 49V 109 5V 75 4V 26 7V 230W 350W 350W 350W 350W 300W 500W 500W 500W 500W 42 9V 37 4V 100V 70V 25V 49V 44 7V 100V 70V 25V 44V 125V 87V 31V 52V 121V 88V 32V 45 Hz 30kHz 45 Hz 22kHz 45 Hz 30kKHz 45 Hz 22kHz 34dB 34dB 42dB 39dB 30dB 35dB 35dB 42dB 39dB 30qB OdBu 775mV 20 kOhm 25 V us 30 V us 45Hz 50kKHz 45Hz 25KHz 45Hz 50KHz 45Hz 25 kHz lt 0 05 lt 0 1 lt 0 2 lt 03 lt 0 05 lt 0 1 lt 0 2 lt 0 3 lt 0 08 lt 0 1 lt 0 3 lt 05 lt 0 08 lt 0 1 lt 0 3 lt 0 5 lt 0 03 lt 0 2 lt 0 2 lt 0 2 lt 0 03 lt 0 2 lt 0 3 lt 0 3 lt 80dB 20 kOhm gt 300 gt 200 gt 300 gt 200 0 7dB 0 8dB 0 9dB 0 7dB 0 8dB 1 1dB gt 100 dB 27 BRIDGED MODE Direct Output Isolated Outputs Direct Output Isolated Outputs Output Definition 8Q 200V 140V 50V 8Q 200V 140V 50V Load impedance or rated output voltage Rated Load Impedance 57Q 280 3 6 Q 400 19 60 2 5 Q isolated outputs only Rated Output Power 560W 700W 700W 700W 600W 1000W 1000W 1000W THD lt 0 2 45Hz 20kKHz Maximum Bridged Output Power 900W 820W 800W 780W 1200W 1180W 1160W 1140W THD 1 1kHz GENERELLPower Requirements 230V 50Hz 60Hz Power Consumption at 1 8 maximum output voltage rated load impedance 690 W 870 W Protections
24. tion Caution The bridging cable has to be at least 1 5 mm in diameter Driving 4 ohms loads at the direct output is not admissible in bridged mode operation For details on nominal load impedance and nominal loads of the individual outputs in bridged mode operation please refer to the specifications in the appendix Also in bridged mode the nominal load impedance is not to be declined 23 CIRCUIT L TO CHASSIS SWITCH a GROUNDED mm UNGROUNDED POWER aii iia 24V ON OV OFF CHA CHB O umt O sena O O PROTECT O POWER GROUND Lift Switch The ground lift switch helps is a perfect means for eliminating possible ground noise loops In case the power amplifier is operated together with other equipment inside of a rack shelf system the switch should be set to its GROUNDED position When using the power amplifier together with other equipment that operates on different ground potentials the switch should be set to UNGROUNDED Power On And Remote Control When the power amplifier is operated via power remote start standard operation an external 24 V power source has to be connected to the POWER REMOTE terminal strip and the mains switch has to be set to its OFF posi tion When correctly connected and with a present supply voltage the power amplifier is operational The fans run for approximately 2 seconds and the POWER ON LED on the front panel lights Th
25. xible connections all floating output voltages 25 V 70 V and 100 V ISOLATED OUTPUTS as well as the low impedance output DIRECT OUTPUTS of both channels are directly accessible x AUDIO TRANSFORMER OUTPUTS B LOW IMPEDANCE A 100V BRIDGED 100V 1200W 8 Q B DUAL A 600W 4Q a WC QCODOOOOOOOD ISOLATED OUTPUTS figure power outputs of the DPA 4260 20 igure printed board assembly area channel A transformer retrofitting Power Outputs AUDIO TRANSFORMER OUTPUTS The two integrated output transformers convert the power amplifiers nominal output voltage to the commonly used loudspeaker line voltage standards 25 V 70 V and 100 V These voltages are simultaneously present at the correspondent floating outputs of the binding post strip The two power amplifier channels can be operated using any possible output voltage combination Simultaneous operation of low impedance loudspeaker systems and floating loudspeaker lines on a single power amplifier channel is possible as well Caution It is possible that during operation shock hazard output voltages can be present at the power output connectors gt 34 V peak value Therefore the connected loudspeaker lines have to be installed in accordance to applicable security standards and regulations When installing and operating 100 V loudspeaker networks compliance to the VDE regulation DIN VDE 0800 is
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