1U Mixer-amps & Slave amps User Manual
Contents
1. O adastra 1U Mixer amps amp Slave amps A121 Mixer amp USB FM 120W 952 904 A251 Mixer amp USB FM 250W 952 906 S121 Slave amp 120W 952 908 251 Slave amp 250W 952 911 User Manual O0 o 0000 0 mr Mt MIC2 LOW HIGH LINEI LINE2 USB FM AUX LOW HIGH MASTER A121 MIXER Al 0000F mic2 LOW HIGH LINEI LINE2 USB FM AUX LOW HIGH MASTER ans adastra A121 SLAVE AMPLIF MASTER MASTER Features 2 Mixer amp models and 2 Slave versions Transformer coupled output for 100V or 4 160 operation USB FM audio player on mixer amp models Compact 1U rack mount format Dual fan cooled High efficiency toroidal transformers 32V phantom power for Mic 1 switchable www avsl adastra com Introduction Thank you for choosing this Adastra 1U amplifier This product has been designed to offer reliable high quality amplification for various installation and PA applications 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 risk 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 to2. 0Vmax 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 soeakers should not exceed 90 of the amplifiers 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 NS 20 max 15 20 max 5 20 10 100W Low Impedance Speakers If standard low impedance 40 80 or 16Q speakers are being used these should be connected to the 6 3mm 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 minimum 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 1 1 1 Impedance Speaker 1 Impedance Speaker 2 Overall Impedance therefore for 2 speakers each 8O impedance 1 Eu 1 8Q 8Q 40 SO the overall impedance is 40 for both speakers connected in parallel The diagram below gives an example of this 8QO SPEAKER SYSTEM WIRING Total Load 40 Inputs Slave amplifiers The S121 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
3. 1 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 FM AUX can be adjusted via the HIGH and LOW controls For the USB FM AUX channel pressing MODE toggles between the USB device FM tuner or AUX input as a sound source Turning the USB FM AUxX level control increases the level of the playback through the amplifier For the FM tuner an initial channel search can be performed by pressing CH followed by PLAY PAUSE The USB FM AUX transport controls are as follows Control PRE NEXT PLAY MODE CH CH PAUSE USB Previous track Next track Pause Play Track Time FM Tuner Search down Search up Halt search AUX No function Toggle USB FM AUX FM channel frequency USB Press amp Hold Volume down Volume up Pause Total No tracks The player status is indicated by a small backlit LCD screen to 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 FM AUX channels will be reduced when speaking into MIC1 or MIC2 Adjust t
4. his control to achieve the required amount of ducking of the other channels when MIC channels are used SPECIFICATIONS Model A121 A251 121 251 Power supply Switchable 110 240Vac 50 60Hz IEC Output RMS 40 120W 250W 120W 250W Mic input front MIC1 combo connector XLR jack N A N A Mic inputs rear MIC1 amp MIC2 6 3mm jacks N A N A Line input front AUX stereo mini jack 3 5mm N A N A Line inputs rear LINE1 amp LINE2 RCA pairs N A N A Mic controls MIC1 amp MIC2 Levels Low High EQ VOX N A N A Line controls LINE1 LINE2 USB FM AUX Levels Low High N A N A USB FM AUX player controls Play pause PRE CH NEXT CH MODE N A N A LED indicators On 24 18 12 6 0dB Limit Phantom power 32V switchable Mic 1 N A Line output RCA L R with Master volume control Speaker outputs 40 160 2 x 6 3mm jack 4 ohms min Speaker outputs 100V line Com 100V screw terminals Dimensions 483 x 44 x 325mm 1U Weight 7 8kg 8 4kg 7 5kg 8 0kg Troubleshooting No power LED on control panel Ensure IEC lead is in good condition and connected properly Ensure mains outlet voltage is same as voltage selector Check mains inlet fuse Ensure POWER switch is on Power LED is on but no other LEDs and no output Check input signals and condition of input connection leads Check MASTER MIC or LINE controls are not turned f
5. 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 For microphones which require phantom power a switch on the rear panel can apply 32V phantom to MIC1 front combo and MIC1 rear jack inputs ENSURE THAT ONLY TRS JACK PLUGS ARE USED FOR MIC1 WHEN PHANTOM POWER IS SWITCHED IN Line inputs e g CD DVD mp3 players can be connected to LINE1 and LINE2 channels via pairs of RCA connectors on the rear panel Alternatively for the USB FM AUX 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 on the front panel for playback of digital audio files stored on a USB pen 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 MIC
6. ng from mics Face microphone away from speakers and monitors Reduce channel volume and EQ settings Reduce MASTER level Amplifier is getting very hot Make sure fans are working properly and not obstructed Ensure cooling vents are clear from debris and dust Check that 40 or 8O 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 40 Note for further troubleshooting refer equipment to qualified service personnel for testing Adastra 2012
7. or storage device HIGH Treble EQ control for MIC channels LED power level and limit indicators VOX Auto voice over control for MIC channels USB FM display Cooling vents USB FM transport and mode controls LINE1 Volume control for Line input 1 3 5mm stereo jack for AUX input channel 3 LINE2 Volume control for Line input 2 POWER Mains On Off switch USB FM AUX Volume control for USB FM AUX channel 1 2 3 4 5 6 7 8 9 n gt SPEAKERS Rear Panel oo NS i OD QRO a ad 4 coke IEC mains inlet and integral fuse Voltage selector 110 240Vac Mono 6 3mm speaker jack outputs 4 160 only 100V speaker output terminals Cooling Fans Connection 24 A fi mic2 D OUTPUT LINE2 LINE BAL e wa a e G BS OUTPUT LINEI FM antenna connection OUTPUT 2 x RCA line output LINE1 LINE2 2 x RCA line inputs MIC1 MIC 2 2 x balanced 6 3mm jack MIC inputs Phantom power switch 32V for MIC1 The Adastra A series mixer amps and S series slaves 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 10
8. qualified service personnel Safety 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 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 POWER avetelerelerare SOVUTI ID LINE2 USB FWAUX LCW HIGH POWER 0000000000000000000000 ad last ra Combo MIC1 input Balanced XLR 6 3mm mic input channel LOW Bass EQ control for LINE and USB FM AUX channels MIC1 Volume control for MIC channel 1 High Treble EQ control for LINE and USB FM AUX channels MIC2 Volume control for MIC channel 2 MASTER Main output volume control LOW Bass EQ control for MIC channels USB input f
9. ully down Turn down VOX control No output from condenser microphone Ensure Phantom Power is switched on turn Master down first Check that condenser microphone is not plugged into MIC2 Power light and output LEDs lighting but no output Check speaker leads are in good condition and connected properly Check speakers are working test on another amp if available FM tuner drifts from programme channel Attach an FM antenna to the F connector on the rear panel Switch unit off and then on again tuning may drift with temperature Press CH then PLAY PAUSE to perform channel search store USB player will not play audio from media Press PLAY on transport controls Check memory device is connected properly remove and re insert Check file types standard compressed digital audio files required Check memory device works on a PC or Mac for standard playback Output is very loud or LIMIT LED is on constantly Check level of input signal is not too high Reduce channel volume and EQ settings Reduce MASTER level until LIMIT light stops flashing Ensure Hi Z line level input s not connected via MIC1 or MIC2 Output is working but at very low level 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 Feedback loud squealing or howli
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