Alpha plus - DjangoBooks.com
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1. Warning Only use headphones with stereo jackplugs in this output socket 3 send Send is an output to connect to an external effect device and in conjunction with return input forms a loop here designed as external effect loop The ef fect can be switched on or off via footswitch 4 return Return as part of the effect loop operates as signal input from an external effect device from output of the effect device The effect can be switched on or off via footswitch Return on its own can also be used as quasi auxiliary signal input 10 dbV 5 tuner The tuner output supplies a pre master signal 9 dbV to connect an external tuner to the Alpha plus 6 footswitch Connection socket for a double footswitch on off switch tip internal effect ring external effect on off 7 DI out Preamp output with symmetrical signal after tone control pre master without effects 8 power on Combined mains switch with mains socket and fuse holder 4 Starting up 4 1 Cabling and switching on Before connecting to mains please ensure that your local mains voltage is suitable for the voltage of the device e g 120V in the USA 230V in Europe The relevant specs and safety symbols are prin Model Amp Name 3 00000000000 Juse A ted on the rear side of mm sd on Connect all cables ac cording to your application and switch the amplifier on The green power control LED indicates operatio2. line mic 3 gain 4 input inp 2 5 high low 6 clip 7 colour 8 bass 9 middle 10 treble 11 efx level 12 power 13 master signal input combo socket for 6 3 mm mono jackplug and XLR connectors 48V phantom power signal source selector switch line only via jackplug for instruments pickup and other line level sources mic only via XLR connector for microphones input level control signal input socket for 6 3 mm mono jackplug input sensitivity switch attenuator overload indicator tone colour filter activation switch MM not active active bass frequency level control middle frequency level control treble frequency level control inputs 1 2 effect level control reverb on off status indicator master level control mains amp master The Acoustic People C Ic DC ae Ic DC Ic DC gt at Ic IC gt DC IC IC OCE lineout alpha plus OCE T IF ACAUTIO INN GE ATTENTION L DL PEA C Ic DC DC XE DC DC DC DE D send tuner retum Di out h te fx power on a Onisas Oz CERF C DC IC IC IC C Ic IC IC gt 18 AlphaPlus 111217 Made in Germany by AER 3 2 Rear side 1 line out The line out supplies a pre amp signal taken after tone control effects and master for forwarding to other appliances 2 headphones This output enables you to connect stereo headpho nes and mutes the loudspeaker
3. 1 Switchable line or microphone input colour 3 dB at 700 Hz 10 dB at 8 kHz switchable Combo socket XLR jack Ya 6 35 mm input 2 line mode jack only bass 8 dB at 100 Hz shelf type Unbalanced high impedance input for middle 6 dB at 800 Hz instrument pick ups and line level sources Min input voltage nr mV 36 dBV treble 8 dB at 10 kHz shelf type Input impedance 2 MA 300 pF Internal Built in digital reverb Equivalent input noise A weighted effect 2 1 WV 114 dBV External Parallel effect loop effect blended with dry mic mode jack or XLR effect sound see send and return XLR balanced stereo jack balanced or mono jack unbalanced microphone input Min input voltage 2 mV 54 dBV Max input voltage 1 V 0 dBV Input impedance balanced 1 2 kQ Input impedance unbalanced 2 7 kQ Voice filter 10 dB at 260 Hz ref to 10 kHz Equivalent input noise A weighted 0 7 uV 123 dBV Phantom power 48 V XLR only R 6 8 kQ per terminal total current max 10 mA short circuit protected input 2 Unbalanced high impedance input for instrument pick ups and line level sources Mono jack Y 6 35 mm Min input voltage 14 mV 37 dBV Max input voltage 5 V 14 dBV High low switch attenuator 10 dB Input impedance 2 2 MQ 300 pF Equivalent input noise A weighted 1 2 uV 118 dBV Optional phantom power see notes 9 V DC at ring terminal max 100 mA short circuit pro
4. e an op timal and distortion free performance Finally set the desired overall volume level with the master level control 5 Functional characteristics 5 1 Tone control The triple band equalizer of your Alpha plus provi des you with an active and high quality sound inter action tool that supports the natural tone of instru ments and voice whilst simultaneously offering you the possibility of a controlled accentuation With all controls in mid position the filters are set to produce a very pleasing and natural sound impressi on that you can colour up by using the colour fil ter with the effect of lowering the mids and lifting the trebles The tone becomes more open and light and is especially suited for fingerpicking techniques The equalization can support or soften the effect of the colour filter and allows a differentiated mids accentuation A with colour filter switch pressed reduce treble to soften possible sharpness colour bass middle treble 009 B without colour filter switch not pressed boost treble to brighten the sound colour bass middle treble MO Note The active equalization of the Alpha plus effects the signal adjustment If you spot an intensified flicke ring of the clip indicator readjust the signal level with the gain control s 4 2 Level adjustment 5 2 Effects The Alpha plus has a built in internal reverb effect The efx level control determine
5. ed to the XLR socket of in put 1 In general suitable units are e g condenser micro phones active Dl boxes and other special audio devices whose power supply is drawn from the phantom power Such devices are also labelled ac cordingly please heed the permissible power con sumption max 10mA High quality dynamic microphones with a balanced signal need no phantom power but can handle it anyway Other devices which have not been designed expli citly for phantom power operation can suffer from considerable malfunctions and damage may result as well Examples of devices that may be damaged by incor rect application of phantom power include Low cost dynamic microphones with a mono jack plug unbalanced signal that were fitted afterwards with an XLR connector Audio devices with a balanced XLR output e g DI boxes effects devices instrument preamps with a DI output etc which are not protected against phan tom power applied to their XLR output The DI con nectors on AER products are protected against ap plied phantom power Other audio devices such as preamps effects pedals etc whose unbalanced line output was replaced by an XLR socket If in doubt please consult the manufacturer of the device you are using We wish you lots of fun playing your Alpha plus P S For questions or suggestions contact us tachauch aer amps com 6 Technical specifications Alpha plus Input input
6. is powered off 16 This device should be installed near the socket outlet and disconnection of the device should be easily accessible The mains plug of the power supply shall remain readily operable Protect the po wer cord from being walked on or pinched particu larly at plugs convenience receptacles and the point where they exit from the apparatus 17 This product may cause permanent hearing loss Do not operate for long periods of time at a high volume level or at any level that is uncomfortable If you experience any hearing loss or ringing in the ears you should consult an audiologist 18 The product should be located away from heat sources such as radiators heat registers or other pro ducts that produce heat 19 Do not place any open sources of fire like can dles on the device 20 Care should be taken so that objects do not fall onto the device and liquids are not spilled into the enclosure through openings Ensure that no objects filled with liquids such as vases are placed on the device 21 Do not place this device on an unstable cart stand tripod bracket or table The de vice may fall causing serious injury to you and serious damage to the device itself 3 Controls and connections input mine gain input high gain ap colour bass middle treble efx level master power PDA WA ee WAA Olalpha plus IF_AlphaPlus_111217 3 1 Front side 1 input inp 1 2
7. ll sizes and little weight Read on and have fun using your Alpha plus 2 Important Safety Instructions The following guidelines shall help minimize the risk of injury through fire or electric shock CAUTION ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR The lightning flash with AN we arrow head symbol within an equilateral tri angle is intended to alert the user to the presence of unisolated dangerous voltage within this product s enclosure that may be of sufficient magnitude to con The exclamation point IN ii an equilateral triangle is intended to alert the user to the presence of important operating and mainte nance servicing instructions in the literature accompanying this product stitute a risk of electric shock to persons 1 Carefully read these safety notes before you use the device 2 Keep these safety notes in a safe place 3 Pay attention to all warnings instructions and ad ditional texts on the unit 4 This device was only designed for operation under normal climatic conditions temperate climate 5 Do not install or use your amp in close proximity to water or if you are wet yourself 6 Do not subject your device to sudden and severe temperature changes This could cause moisture condensation inside the unit which could damage it In the event of moisture condensation allow the device to dry out completely before use 7 Use your amp in a safe place where n
8. nal readiness 4 2 Level adjustment Note Level adjustment By setting the level correctly we mean the signal level in one or several devices in a signal chain is neither too high nor too low This applies equally to all circuits in a complete circuit design EQs preamps etc Consequently care must be taken that no part of the circuit is overloaded or that distortion is unintentionally added to the signal We have carefully designed the circuit to achieve this objec tive whilst also providing controls for manual intervention input mine gain input a high gain i colour mic low ip gt A input 2 First ensure that the master level control is zeroed over to far left so that when you are setting the sound level the signal passes through the electro nics only and does not reach the loudspeaker By pressing the high low attn resp line mic swit ches you can adapt the amplifier to your signal sour ces guitar pickups microphone etc Turn the gain control clockwise until the red clip indicator flashes momentarily when playing with a strong attack Thus you make sure that your signal source e g instrument provides the input stage of the amplifier with the necessary input The clip LED indicates an overload A short flicker is of no danger to AER devices During operation a short flicker can be accepted to be on the safe side you should reduce the gain slightly to achiev
9. obody can step on cables or trip over and damage them 8 Pay attention to an unhindered air circulation around the amp never obstruct the air vents or grilles 9 Always pull the mains plug before cleaning your amp or when left unused for a long period of time Use only a dry cloth for cleaning Avoid the use of de tergents and do not let any liquids seep into the unit 10 Use only the right fuses with the same current rating and trigger characteristic as replacements Never mend fuses Pull the mains plug before repla cing a fuse Should a fuse blow again after a short while the device needs to be checked 11 Never install your amp close to devices with strong electromagnetic fields such as large mains transformers revolving machines neon illumination etc Do not lay signal cables parallel to power current cables 12 There are no user serviceable components in side the unit To avoid the risk of an electric shock the unit must not be opened All maintenance ad justment and repair works should be carried out by qualified staff only Any unauthorized tampering will void the 2 year warranty 13 In keeping with the EMV regulations screened cables with correctly fitted connectors must be used for all signal connections 14 Always use an earthed power supply with the correct mains voltage If you are in doubt about the power outlet ground have it checked by a qualified technician 15 Cable up your amp only when it
10. rs pin assignment 1 ground 2 positive 3 negative Options Microphone input can be attenuated by 5 dB by an internal jumper increasing the max input voltage to 1 6 V 4 dBV 9 V phantom power for input 2 can be activated by an internal jumper When activated operation without phantom power is still possible by using a mono jack connector 48 V phantom power for the XLR input can be deactivated by an internal jumper The jack input does not have 48 V Warning External equipment may be damaged by inappropriate use of phantom power Specifications and appearance subject to change without notice TD20111208 21601102 82120608 YIAVIdS 3N09 VNA S3NOHd ann 1 A Ho ALAN IH Y U3MO4WOLNVHAA F Nunias anas 103443 NAL jie aa RR Bal Seho SS ee ee 7 Circuit diagram Alpha plus L MANI MOTHOIH 1 To aal dwwaud ZANNI Nr Er H3MOd WOLNVHd A6 10 notes 11
11. s the intensity of the internal effects left stop no effect Furthermore an additional effects unit external ef fect may be connected to the Alpha plus For this purpose use the send and return sockets on the rear side of the amplifier send goes to input return to the output of the external effects device The inten sity of the effect is adjusted at the external effects unit The external effect loop works parallel the effect is blended with the original signal 5 3 Footswitch A standard double footswitch on off switch can be plugged into the footswitch socket on the rear side of the amplifier via stereo cable By this footswitch the internal and external effects can be switched on and off 5 4 Phantom power Microphones requiring 48V phantom power can be directly connected to the XLR socket of input 1 Factory provided phantom power is activated but if required may be deactivated by an internal jumper In contrary 9V phantom power if required can additionally be activated in input 2 by an internal jumper Please note For both alterations the device must be opened therefore only qualified service personnel may carry out the modifications concerning the de activating of phantom power General Note Use of 48V or 24V phantom po wer Phantom power remote supply here powering an audio device via the connected audio line Only units which are designed to handle phantom power should be connect
12. tected return Return input for effect loop Mono jack Y 6 35 mm Min input voltage 150 mV 17 dBV Max input voltage 5 V 14 dBV Input impedance 20 kQ 5 kQ if effect is switched off by footswitch clip LED Headroom min 8 dB headphones Headphones output When plugged in the internal speaker is switched off Stereo jack Ya 6 35 mm L R connected Max output power 2 x 65 mW 1000 Q Input sensitivity for 2 x 50 mW 1000 Q 19 mV 35 dBV at input 1 line mode Output impedance 470 Q shared by L and R Note Suitable for headphones with stereo jack Does not work with mono jacks line out Preamplifier output after master volume Mono jack Y 6 35 mm Output voltage 1 4 V 3 dBV tuner Tuner output Mono jack Y 6 35 mm Output voltage 450 mV 7 dBV Dl out Balanced XLR output before master after tone controls without effects Output voltage differential 190 mV 15 dBV send Send output for effect loop before master after tone controls Mono jack Y 6 35 mm Output voltage 450 mV 7 dBV Footswitch connector footswitch Connector for a dual footswitch Stereo jack Ya 6 35 mm tip internal effect on off ring external effect on off sleeve common ground Effect is OFF when the footswitch is ON Power Power amp 40 W 4Q at 1 THD DMOS monolithic 1 C Dynamic range A weighted 92 dB Limiter Threshold 35 W 4Q Analog S
13. ubsonic filter adaptive peak limiter signal _Processing Speaker 8 200 mm twin cone full range speaker system bass reflex enclosure Mains Mains voltage depending on model power 100 120 230 or 240 V 50 60 Hz Power consumption max 100 W Mains fuse Size 5 x 20 mm For 230 and 240 V models T 1 AL For 100 and 120 V models T2 AL General Cabinet 12 mm 0 47 birch plywood Finish Waterbased acrylic black spatter finish Dimensions 265 mm 10 4 high 330 mm 13 wide 235 mm 9 25 deep Weight 7 2 kg 15 9 Ibs Definitions and conditions Input and output voltages are RMS values for a sine signal and 1 kHz unless stated otherwise Tone controls in neutral position unless stated otherwise Min input voltage Required input voltage for 35 W 4Q output gain and master fully clockwise Max input voltage Allowable input voltage that does not cause more than 1 total harmonic distortion assuming suitable control settings Output voltages refer to 50 mV 26 dBV at input 1 line mode gain and master max Equivalent input noise voltage Noise voltage at speaker divided by voltage gain of amplifier for white noise for the input under test Gain and master fully clockwise input shorted 20 Hz 20 kHz gain of unused inputs in zero position Dynamic range of power amplifier Ratio of output voltage at limiter threshold to A weighted noise voltage with master in zero position XLR connecto
14. user manual Alpha plus Alpha plus Register your Alpha plus www aer amps com gt product registration Alpha plus user manual Contents Page 1 Introduction 3 2 Important safety instructions 4 3 Controls and Connections 5 3 1 Front side 5 3 2 Rear side 6 4 Starting up 4 1 Cabling and switching on 4 2 Level adjustment 7 5 Functional characteristics 7 5 1 Tone control 7 5 2 Effects 8 5 3 Footswitch 8 5 4 Phantom powering 8 6 Technical specifications 9 7 Circuit diagram 10 1 Introduction Welcome to AER Thank you for choosing the Alpha plus The Alpha plus is a complement to our Alpha still as professional and versatile as the Alpha itself but pro vided with increased power output With one channel but two independant input stages line and microphone line a dynamically controlled 50 Watts power amplifier 8 twin cone speaker sys tem 3 band equalization and reverb the Alpha plus is applicable for the enhancement of a wide variety of instruments just as well as vocals Although especially developed for acoustic instru ments the Alpha plus is suited excellently for all other even electrical instruments and the 48V phantom power supply of the XLR input allows the operation of high quality condenser microphones The whole system ensures impressive dynamics plus a well balanced distortion free tone at all sound pres sure levels despite strikingly sma
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