1U Mixer-amps & Slave amps User Manual
Contents
1. oO adastra 1U Mixer amps amp Slave amps A121U Mixer amp USB SD FM 120W 952 903 A251U Mixer amp USB SD FM 250W 952 905 121 Slave amp 250W 952 908 S251 Slave amp 250W 952 911 User Manual POWER 000000000000 000000000 E 9009 KOC IJ o 0000o a n OA OCOOO adastr E mic2 LOW HIGH vox LINE LINE2 USB SD LOW HIGH MASTER A121U MIXER AMPLIFIER 120W O 2 LOLOLOLOLOIOLOLOLOLOLO 0101010101010010 O 9009 60 0 0006o O 7 88 MICI mic2 LOW HIGH VOX LINE LINE2 USB SD LOW HIGH MASTER 0000000 2510 HRERAMPLFLER 020101010101010101010101010101010101010101010101010101010 0 OQO0000000000000000000 MEGS Ye ON M 18 12 6 Ou S121 SLAVE AMPLIFIER 1204 opelenie COO00D0000000000000000000000000 OOO00O00GQ00000000000000 o ad ON M 18 2 amp ount 251 T 7 nes 50W KAALA KA Features 2 Mixer amp models and 2 Slave versions Transformer coupled output for 100V or 4 160 operation USB SD FM audio player on mixer amp models Compact 1U rack mount format Dual fan cooled High efficiency toroidal transformers www adastra pa com Introduction Thank you for choosing this Adastra 1U series amplifier This product has been designed to offer reliable high quality mixing for stage and or studio applications with unfailing consistency In order to gain the best results from this equipment and avoid damage through misuse please read and follow these instructions and retain for future reference Warning To prevent the risk2. LINE 2 USE SD LOW HISH MASTER j 1U MIXER AMPLIFIER ol 10 O 09 6689 G 90098 OOar o OQO Y BOoOO OO OD OO Oo 070101010910101010101010101010103010101010 MECC Ye Ml Sarr rian Me dn lial ch pS 121 SLAVE AMPLIFIER 120W yyryyyy e Combo MIC1 input Balanced XLR 6 3mm mic input channel LOW Bass EQ control for LINE and USB SD channels MIC1 Volume control for MIC channel 1 High Treble EQ control for LINE and USB SD channels MIC2 Volume control for MIC channel 2 MASTER Main output volume control LOW Bass EQ control for MIC channels SDcard slot and USB input HIGH Treble EQ control for MIC channels LED power level and limit indicators VOX Auto voice over control for MIC channels USB SD FM display Cooling vents USB SD FM transport and mode controls LINE1 Volume control for Line input 1 3 5mm stereo input for LINE1 channel LINE2 Volume control for Line input 2 POWER Mains On Off switch USB SD Volume control for USB SD FM audio player il 2 3 4 5 6 fa 8 9 ey Rear Panel SPEAKERS INPUTS vil QTO t EOR l 4 160 MIC 2 Mic 1 OUTPUT LINE2 LINE1 BAL BAL yy a er ot oniran wet ve Aare van ORE a aa l 1 ee ae ae oa WN Cran TE aS MATA Eae mee asa l l 1 an m ch fa ar q 7 q7 OUTPUT LINE1 IEC mains inlet and integral fuse Cooling Fans Voltage selector 11
3. of fire or electric shock do not expose any of the components to rain or moisture If liquids are spilled on the surface stop using immediately allow unit to dry out and have checked by qualified personnel before further use Avoid impact extreme pressure or heavy vibration to the unit There are no user serviceable parts inside the amplifier refer all servicing to qualified service personnel Safety e Check that the mains lead is in good condition and that the supply voltage selector switch matches the supply voltage Ensure signal leads and speaker cable s are in good condition e Do not use the USB connector as a general purpose power source or charger Do not allow any foreign particles or liquids to enter the amplifier through the cooling vents Do not cover or obstruct cooling vents or fan grilles Placement Keep out of direct sunlight and away from heat sources Keep away from damp or dusty environments When rack mounting secure firmly in place and avoid positioning heavy items directly on top of the unit Ensure adequate access to controls and connections and pay attention to cooling air flow Cleaning Use a soft cloth with a neutral detergent to clean the housing as required Use a soft brush to clear debris from the cooling vents and connectors Do not use strong solvents for cleaning the unit Front Panel PN POWER Q 0090 A OO YI Gadastra mic1 mic2 LOW HISH VOX LIRE 1
4. 0 240Vac OUTPUT 2 x RCA line output Mono 6 3mm speaker jack outputs 4 160 only l LINE1 LINE2 2 x RCA line inputs 100V speaker output terminals MIC1 MIC 2 2 x balanced 6 3mm jack MIC inputs Connection The Adastra A1U series mixer amps and S1 series slave can drive EITHER 100V line OR 4 160 speakers Both types of speaker should NOT be connected together to the same amplifier 100V Line Speakers 100V line speakers must be connected using the 100V and COM screw terminals 23 on the rear panel All 100V line wiring should be run with double insulated cable rated to the max current for the system For example in a 250W system 100Vmax 250W 100V 2 5A so the speaker cable should be rated to 2 5A minimum Each speaker must be connected in a parallel chain and the total wattage for all speakers should not exceed 90 of the amplifier s rated output Please see the diagram below to show an example arrangement 100V LINE SYSTEM WIRING All components wired in parallel tapped to 90 of amplifiers max power output ATTENUATOR SS 0 30W KG ATTENUATOR S 0 20W DON 20 max 15 20 max 5 20 10 100W Low Impedance Speakers If standard low impedance 40 8Q or 16Q speakers are being used these should be connected to the 6 8mm output sockets on the rear panel using quality speaker jack leads Both of these outputs are fed from the same amplifier section which is mono The mini
5. LIMIT light stops flashing Ensure Hi Z line level inout s not connected via MIC1 or MIC2 Check input audio source level is not too low Increase channel volume and EQ settings if turned down Increase MASTER level Check for quiet recording of media files on USB SD card Face microphone away from speakers and monitors Feedback loud squealing or howling from mics Reduce channel volume and EQ settings Reduce MASTER level Make sure fans are working properly and not obstructed Ensure cooling vents are clear from debris and dust Check that 40 or 80 speakers are not connected to 100V terminals Ensure total 100V speaker wattage is not more than amplifier rating Ensure that 100V and 40 or 80 speakers are not both connected Ensure that total load across speaker jack outputs is not less than 4O No power LED on control panel USB SD player will not play audio from media Output is working but at very low level Amplifier is getting very hot Note for further troubleshooting refer equipment to qualified service personnel for testing Adastra 2011
6. igital audio files stored on either USB pen drive or SD card The overall mix can be connected to further amplifiers via the OUTPUT pair of RCA connectors Operation With all volume levels and VOX control turned down connect the amplifier to the mains supply ensure correct supply voltage using a suitable IEC lead as supplied and switch POWER on HIGH and LOW EQ controls should be initially set to the vertical 12 o clock position If microphones are being used turn up the MASTER control approximately half way and gradually increase MIC1 rotary level control whilst speaking into the microphone until the required volume is reached Repeat for MIC2 volume control Adjust HIGH and LOW EQ controls to alter the overall bass and treble response of both microphones as needed For any line level devices connected to line input channels adjust the LINE1 and LINE2 level controls in the same way as for the microphone channels Overall tone of the line inputs including the USB SD FM player can be adjusted via the HIGH and LOW controls For the USB SD FM player pressing MODE toggles between the USB device SD card and FM tuner as a sound source Turning the USB SD level control increases the level of the playback through the amplifier The transport controls are as follows NEXT PLAY cH HAUSE a Previous track Next track Toggle Play Pause USB Toggle USB SD FM The player status is indicated by a small backlit LCD screen t
7. mum impedance of the total speaker load connected to either or both of these sockets must be no lower than 40 The impedance is calculated using an inverse calculation as shown below oT ee eee o l Impedance Speaker 1 Impedance Speaker2 Overall Impedance therefore for 2 speakers each 8Q impedance A A BO 8Q 40 SO the overall impedance is 4Q for both speakers connected in parallel The diagram below gives an example of this 80 SPEAKER SYSTEM WIRING emmm Total Load 40 Inputs Slave amplifiers The 121 and S251 slave amplifiers accept a LINE IN via 2 x RCA connectors at the rear and the same signal can be sent out to further amplifiers from the LINE OUT pair of RCA connectors Since the amplifier is mono all stereo inputs are summed together Inputs Mixer amplifiers A microphone can be connected to MIC1 channel by either 6 3mm jack or XLR to the front panel combo input If required there is also a 6 3mm jack connection on the rear panel for MIC1 channel A further microphone can be connected to MIC2 channel via a 6 3mm jack on the rear panel Line inputs e g CD DVD mp3 players can be connected to LINE1 and LINE2 channels via pairs of RCA conneciors on the rear panel Alternatively for LINE1 channel a stereo 3 5mm socket on the front panel can be used instead ideal for portable mp3 players etc There is also a USB type A connector and SD card slot on the front panel for playback of d
8. o the immediate left of the transport buttons For MIC channels priority increasing the VOX control will cause the level of playback through the LINE or USB SD FM channels will be reduced when speaking into MIC1 or MIC2 Adjust this control to achieve the required amount of ducking of the other channels when MIC channels are used SPECIFICATIONS USB SD FM player controls LED indicators Line output Speaker outputs 40 160 2 x 6 3mm jack 4 ohms min Speaker outputs 100V line Dimensions Weight Troubleshooting Ensure IEC lead is in good condition and connected proper Ensure mains outlet voltage is same as voltage selector Check mains inlet fuse Ensure POWER switch is on Check input signals and condition of input connection leads Power LED is on but no other LEDs and no output Check MASTER MIC or LINE controls are not turned fully down Turn down VOX control Power light and output LEDs lighting but no output Check speaker leads are in good condition and connected proper Check speakers are working test on another amp if available Press PLAY on transport controls Check memory device is connected properly remove and re insert Check file tyoes standard compressed digital audio files required Check memory device works on a PC or Mac for standard playback Check level of input signal is not too high Output is very loud or LIMIT LED is on constantly Reduce channel volume and EQ settings Reduce MASTER level until
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