APart MA125 AV receiver
Contents
1. a Da PES moune ampurters EID Dap C MIXING AMPLIFIERS N 100Volt 100Volt MA125 a ES EA wae TR I REE SEAS EY REE ER EE L E ES TE EES BES SO ESR Terr ee ee ee ee ee ee ee ee ee ee eee SR SNNN moa PSE SSeS EeERR Et eS SSNS SSS cts BEET EE T ia Find more interesting audio solutions at www apartaudio com MASTER The MA125 is developed by Audioprof nv Lanteernhofstraat 90 BE 2100 Deurne BELGIUM info apart audio com www apart audio com OWNER S MANUAL rape MIXING AMPLIFIERS WHT 100Volt SAFETY INFORMATION HOOT The MA125 is a very compact professional PA mixing amplifier for commercial and industrial applications All microphone inputs have integrated speech filters He s able to drive 8 ohm or constant voltage loudspeaker lines 50 70 100V The amplifier has 4 microphone 4 selectable line inputs and one emergency telephone input Mic input 1 is meant to be the main microphone paging input for its signal can be fed via the front 4 TRS phone jack or via a XLR3 DIN 5 or euro block connector at the back When needed two APart paging microphones can be wired in parallel on each mic input The MA125 has a three level priority system The emergency telephone input at the back has the highest priority Its signal goes directly to the main amplifier bypassing any front cont2. should be set fully counter clockwise If not hiss might occur 7 Microphone 4 line 4 level control Adjusts the input signal of the microphone connected to the XLR3 input at the back or the line source connected to stereo RCA input 4 for example a wireless microphone see 27 8 Muted by priority led This red led will blink when any priority status has been activated see also 18 9 Music level control Here you can adjust the level of the line source selected 10 Line source selector Select the desired music source to be heard AUX CD or TUNER 11 Bass control Adjust as per your taste In reverberant rooms intelligibility can be increased by decreasing bass The centre position gives you a flat response 12 Treble control Adjust the level as per your taste or needs Adding high frequencies gives brilliance to your sound High frequency feedback can be removed by decreasing treble The centre position gives you a flat response 13 Master level control Here you can adjust the desired volume of the overall signal Important notice 2x4 Eight microphones possible When you use more than one microphone input at the time in super markets for instance it is important to use real paging microphones APart MICPAT MICPACB These microphones maintain the microphone input impedance when not switched on This avoids unwanted noise to come out of your loudspeakers APart MA mixing amplifiers accept two APart microphones wir
3. it under moist conditions can even be dangerous 3 Clean only with dry cloth 4 Do not operate near heaters or place it on other apparatus which produce a lot of heat 5 Be sure your unit is always connected to the electrical safety earth Do not defeat the safety purpose of a grounding type plug If you have any doubt please consult your dealer or a qualified technician 6 Take care for the power cord Never use a damaged power cord and install it in such a way that no one can walk on it 7 Only use accessories specified by the manufacturer 8 Distorted sound indicates that operating conditions are bad Decrease the volume check the speakers and sources connected or switch off the unit 9 Disconnect the unit from the mains power supply when you do not use it for a longer period 10 When smoke ore bad smell comes from your MA125 switch off immediately and disconnect from mains 11 This apparatus should only be serviced by qualified personnel If not the warranty might be void 12 Do not remove the cover panel Removal of the cover will expose hazardous voltages 13 Do not block the air inlets of the amplifier and see that sufficient cool air can be supplied 14 Please check the units condition after unpacking If the outside of the carton box has been damaged inform your shipper immediately 15 Check all speaker lines for load charge by APart wattmeter WM100 and short circuits before connecting them to your amplifiers ra
4. of the protections have been activated No or distorted sound will be heard anymore This will be in case of overheating being the result of drawing too much power from your amplifier or the impedance of the speaker lines connected are below the minimum load impedance see 17 3 Level indicators clip limit A green LED will light after powering on To work within normal conditions the volume indicator should be kept under OdB 100 At 2 5dB a limiter will be activated This red LED indicates that the auto gain circuit keeps the level below clipping This is NOT a clip indicator but an indication of the automatic gain control 4 Microphone 1 input This balanced TRS phone jack has been wired in parallel with the other three input options for microphone 1 at the back For normal operation use only one input at the time for microphone 1 but when useful two microphone inputs of mic 1 can be used together see note below Microphone 1 can be given a priority over all the other inputs except the emergency input see 20 by using the VOX priority see 30 5 Microphone 1 level control Adjusts the volume of the microphone connected to one of the four input connectors 1 4 jack XLR3 DIN5 or euro block 6 Microphone 2 3 level control By turning each control clockwise the desired level of that input in the total mix is set To decrease these levels turn counter clockwise The volumes of the inputs not used open lines
5. Q For 70V operation the minimum impedance should be 40 Q and for 50V 20 ohm Don t mix the types of speaker connections Only one at the time should be used unless you are able to calculate a combination which does not overcharge the amplifier example 1600 at 100V for a loud zone in combination with 400 at 50V for a quiet zone 18 24V DC output At this terminals 24V DC will be available max 0 6A from the moment any priority has been activated to control priority relays of local volume attenuators or other devices 19 Emergency telephone level With this potentiometer you can set the desired level of the line level signal inserted into the priority signal input 20 This level will not be influenced by the master level 20 Emergency telephone input Here you can feed the audio source for paging emergency messages etc This input at line level has automatic activation above 200mV and has a line transformer to avoid ground loops useful for telephone Please use a balanced shielded line cable Connect the HOT signal to the COLD to and the shield to G when connecting the shield only at the MA125 side you might avoid a ground loop which creates hum and buzz This signal is directly fed into the main amplifier No microphones should be connected directly to this input without using a mic to line pre amplifier 21 Priority over music contact By closing the contact of the euro block connector or pins 4 and 5 o
6. dB Impedance 30 KQ S N at max volume gt 81 dB Frequency response gt 50Hz gt 20Khz 1 3 dB a 2 P C pune ampuriens Canny 100Volt 000001 How to deal with 100V loudspeaker systems 10000005 BO 15W 15W 15W 15W 3 W 3 W 3 W PAGING MIC AMPLIFIER POWER gt LOUDSPEAKER LOAD POWER In fact working with 100V loudspeakers is rather simple when done in the right way Each 100V loudspeaker has a 100V transformer which can be set to a certain power for example 1 5 3 or 6W As the example shows the sum of all loudspeaker settings should never exceed the amplifiers power specifications Never use low impedance 8 ohm loudspeakers on a 1 00Volt system even not one More technically When your paging amp has a maximum output of 125 watts at 100V this means that the minimum impedance connecte d should be at least 80 ohm 100x100 125 To check your loudspeaker lines use a decent impedance checker example AP WM100 Now you are reaay to get the best result on distributing your music and messages to your audience Your little giant is like a Swiss knife which will astonish you and many others Troubleshooting No power Check whether the on off switch is in the on position and whether the power cord has been inserted properly If these two have been checked and still the MA125 remains off the fuse might be blown No sound Check all the wires and loudspea
7. ed in parallel on each mic input at the time which can be a very useful tool L Back panel are MIXING AMPLIFIERS 14 16 17 18 24 32 19 20 21 22 APartS AMPLIFIER 1 eA th pa nz naan at C 1 WOXM JTESALL t TML MIC 1 CO ITACT MUTES MUSIC ONLY INPUT 7 Phy Ean ay R Aa INPI OUTPUT TO LOUDSI f CAUTION veaa PUICHEZOLOUDSERAKI Cur artstine NATAAN T A A T MUTES ADE BY R a 33 APART AUDIO j N Koa me LEVEL 15 23 25 26 27 28 29 29 29 30 31 14 Voltage selector Set the local voltage If any doubt contact your dealer The unit is shipped with the selector set to 230VAC 15 Mains socket The unit can be connected to the mains circuit by a standard IEC type power cord This socket contains a 2 5AT slow blow fuse Use a screw driver to flip out the fuse compartment and to replace it by the same type When this fuse blows frequently you should check the speaker load or bring the MA125 to a qualified service centre First check whether you didn t use a quick blow fuse 16 Emergency power supply You can power the amplifier directly from an emergency battery or power supply supplying 24V DC 15A 17 Loudspeaker outputs For low impedance use com and 8Q Keep impedance above 8 Q For 50 70 or 100V speaker lines use COM and 50 70 or 100V terminals For 100V operation the total minimum impedance of the loudspeaker lines should be 80
8. er microphones see 32 30 Mic 1 XLR DIN5 Euro block Use max two of these parallel wired balanced inputs at the time See wiring diagram at the back These three inputs have been wired in parallel with the balanced jack input at the front When you use the APart MICPAT or MICPACB paging microphones connected directly to the DIN5 input the signals fed into the line inputs are muted automatically while paging The same kind of connection can be made using the euro block connector To use vox mute see 30 Phantom power to use condenser microphones see 33 31 Vox mutes all When you activate vox mute by turning this trimmer clockwise to the desired threshold level the signal of any Mic1 input has priority over all other inputs except emergency When you don t need vox mute turn this trimmer fully counter clockwise to the OFF position 32 Airflow output This airflow output should be kept free at all times Keep sufficient room on top and the two sides of your MA125 33 Phantom on off When you switch to the ON position phantom power will be supplied to the microphone input involved so you can use condenser microphones In this case NO unbalanced jacks should be used Phantom power does not damage dynamic balanced microphones MA125 inside controls Inside settings should only be done by persons familiar to electrical equipment Power supply fuse inside the housing When this fuse blows replace it by the same ty
9. f the DIN5 connector the signal of microphones 1 to 4 have priority over the music sources TUNER CD and AUX So the contact closure of the contacts mentioned can give priority to the other microphone inputs as well At the same time 24 V DC will be available at terminal 18 This is very useful when using several microphones in supermarkets etc 22 Chime level When one of the priority contacts are closed a chime can be activated by turning this trimmer clockwise to the desired chime level When you don t need a chime turn this control fully counter clockwise to the OFF position 23 Power amp in pre amp out You can send the signal of the pre amplifier to an external device such as an equalizer APart PXQ2215 or processor and feed the treated signal back into the amplifier via the power amp input From the pre amplifier out you can also feed extra power amplifiers such as the APart PA240P When you don t use this feature the RCA bridge should be placed 24 Aux mono Here you can feed the signal of an external mono music source LOQNQDJ 100Volt 000001 L are MIXING AMPLIFIERS LOQDQD J 100Volt 000001 25 Rec out When you need a copy of the total mix you can connect this output to any recording device such as tape deck MD recorder VHS recorder etc You can also use this output to feed an extra amplifier This output level cannot be controlled separately When
10. ker selectors At least the master and one source should be turned clockwise Check whether the pre amp out is connected to the power amp in In the worst case your MA125 is in protective mode Please check your loudspeaker wiring and loads Operate your MA125 within normal conditions Distorted sound Your input signal is too high Haven t you a line level source connected to a microphone inputQ You might also be drawing too much power from your MA125 and the loudspeaker load might be too low minimum 80 ohm for 100V use Check the speaker wiring and load with an impedance tester Turn down the master level Hum and buzz Please check your wiring and grounding maybe you created a ground loop See that all equipment linked are drawing power from the same power supply Your radio might get its signal from the cable radio In this case you have created a ground loop and a ground loop isolator between the cable signal and your radio antenna input will be the solution Any suggestion They are well appreciated and eventually rewarded Send your ideas or suggestions to suggestion apart audio com L P C enaz Tang aeEe SEER EERE ER SE SE SE SE SB SS P lt a ee D a D D i d PEESSSEEEEES EERE SRR SES tease ae eS seen e ee SS SO SO sE MRM SN SES Se NS 1 Power switch Turns mains power on and off 2 Protect indicator This red LED illuminates when one
11. pe Technical Specifications MIXING AMPLIFIERS General Mains voltage 230 115 VAC or 24VDC Rated output 125W RMS Frequency response 40Hz 22kHz 1 3 dB Distortion lt 0 5 6dB 1kHz Bass control 10dB 100 Hz Treble control 10dB 10 kHz S N amplifier better than 95dB line better than 81dB mic better than 70dB LED indicators limiter active red signal 100 yellow signal 25 dB green power on green protection active red Muted by priority LED any of the priority modes active red Weight approx 9 kg Dimensions 430 W x 102 H x 230 D mm desktop mounted 19 wide 2U high rack mounted height 88mm HPares ree re py MA125 zi AMPUTA sate jouw ch maw J Ok le ele oe SERRE nye 2 Sim sadasa we m R E SSe 00 0 rears Sh Inputs Outputs Mic input 1 4 TRS phone jack at the front XLR3 DIN5 Euro block Speaker zone output euro block Sensitivity 1 5 mV High Z zone 100V Impedance 600 Q S N at max volume gt 70 dB Speaker out euro block Phantom power 14 V High Z 50 20 Q 70 39 2 Q 100V 80 Q Frequency response gt 9OHz gt 15Kh
12. pe 15A quick blow When this happens frequently contact your nearest dealer Now you are ready to build your solid sound system and our extra features will be of great help Note In our policy of continuous improvement changes can appear without prior notice including the user manual
13. rol and an attenuator next to the input sets its level Microphone input 1 has the second priority level With the control next to the DIN5 input the vox voice activated mute for microphone 1 can be activated and mutes all other signals except the emergency input The third level can be activated via a dry contact priority over music and mutes all background music inputs only This contact activates the chime as well only when a level has been set using the chime level potentiometer When the priority contact has been activated 24V DC max 0 6A will be available to activate priority relays of loudspeaker attenuators or other devices When needed the signals mixed via your MA125 mixing amplifier can be recorded or distributed via the record output 19 Brackets are shipped along with your amplifier The MA125 is the device to built professional industrial sound applications You can insert an extra equalizer such as the APart PXQ2215 into the signal path or add extra power amps APart PA240P using the pre amp out power amp in RCA connectors When shipped a RCA bridge has been inserted The MA125 complies with the CE standards Important Safety Instructions Before using your MA125 take a few minutes to read these instructions carefully This little time can avoid a lot of headaches afterwards 1 Keep this manual for future reference 2 Water and humidity are the biggest enemies of electric equipment Operating
14. you connect your MA125 pre amp out or record out to a microphone input of another mixing amplifier this input will have signal overload and the sound will be masked In this case you should use a line input a DI box or other signal levelling device Never connect this output to an amplifier loudspeaker output 26 CD input 300mV Use these stereo RCA inputs to connect a line level source such as CD players MD players etc You have to make your choice with the selector at the front see 10 Stereo signals will be summed together to mono 27 TUNER input 500mV Use these stereo RCA inputs to connect a line level source such as a TUNER You have to make your choice with the selector at the front see 10 Stereo signals will be summed together to mono 28 Line 4 Mic4 input Use only one of these parallel wired inputs at the time To the XLR3 balanced input you can connect any microphone using a balanced two wire shielded cable 1 earth 2 hot 3 cold For using condenser microphones see 32 The Microphone 4 input is a XLR3 jack which will accept a normal XLR3 male plug Line 4 is more sensitive than the other line music inputs therefore ideal to connect wireless microphone receivers 29 Mic 2 3 amp Mic 4 XLR jack input To the XLR or parallel wired stereo jack balanced input you can connect any microphone using a balanced two wire shielded cable 1 or sleeve earth 2 or tip hot 3 or ring cold For using condens
15. z 1 3 dB speech filter Low Z 8 Q Vox mute trigger level 0 6 mV 1Khz mutes mic 2 3 4 music gt 40 dB Phantom power Mic input 2 3 amp 4 XLR3 balanced Mic 1 2 3 4 14V on off switch Sensitivity 1 5 mV Impedance 600 Q Pre amp out S N at max volume gt 70 dB Level 1V Phantom power 14V Frequency response gt 9OHz gt 15Khz 1 3 dB speech filter Record out RCA mono Emergency input euro block Level 1V Sensitivity 1V Priority out Impedance 600 Q Level 24 V DC max 0 6A short circuit S N at max volume gt 85 dB protected Frequency response gt 90Hz gt 20Khz 1 3 dB Mute mutes all gt 40 dB Chime 2 tone Aux input RCA activated by contact closure Sensitivity 500 mV 6 dB on off and level set by trimmer Impedance 22 kQ Priority S N at max volume gt 81 qB Emergency input Telephone Frequency response gt 50Hz gt 20Khz 1 3 dB 200 mV 1 kHz Line 4 RCA mutes all other signals Sensitivity 200 mV 14 dB gt 40 dB Impedance 47 KQ Vox mute only for mic 1 S N at max volume gt 81 dB II 0 6 mV 1 kHz Frequency response gt 50Hz gt 20Khz 1 3 dB mutes mic 2 3 amp 4 music CD in on off level set by trimmer Sensitivity 500 mV 6 dB gt 40 dB Impedance 30 kQ III Priority contact S N at max volume gt 81 dB gt 40 dB Frequency response gt 50Hz gt 20Khz 1 3 dB mutes all music inputs Tuner Sensitivity 300 mV 10
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