AER HEAD ONE Manual 

buy a Head One. You have chosen a powerful, professional-standard amplifier that has been specifically designed for the amplification of elec- tric basses. The Head One’s impressive capabilities are especially noticable with an electric bass, an instrument which has an enormous bandwidth and variation in tonality. We believe we have achie- ved a successful compromise. Everything else is down to you - we believe you will have a lot of fun with Head One. Head one Manual Summary of contents: 1. Introduction 2. Precautions 3. Conception 4. Control elements 5. Technical data 6. Disposal Regulations

electromagnetic fields such as large power transformers, cir- culating machines or neon lighting. Do not lay the signal ca- bles parallel to heavy-duty power lines. • Only connect your Head On when it is switched off. • Remove the power cables before cleaning your Head One. Use a damp cloth to clean with, do not use cleaning chemicals and be sure that no liquid gets into the electronicsZiehen. • The inside of the Head One does not contain parts to be ser- viced by the user. Leave servicing, adjustment and repair to qualified service personnel. Unqualified intervention will re- sult in the invalidation of 2-year Guarantee. • Please look after these operating instructions! 2. Precautions • Read the operating instruments and be sure that you have understood them. • Follow all the warnings, instructions and supplementary texts that are written on the Head One. • Always use an earthed power supply with the correct AC vol- tage. Should you be unsure about the earthing of the power supply, have it checked by a qualified electrician. • Do not install or use your Head One close to water, or if you are yourself wet. • Use your Head One where it is protected and where no-one can tread on the cables or fall and damage them. To avoid injury through Fire and Electric Shock when using the Head One, always be sure to adhere to the following safety precautions.

Power Amplifier) specifically designed to amplify electric or semi-acoustic bass instruments. As with all of our amplifiers, we place great value in designing amplifiers as small as possible. The weight of an amplifier is as important to us as the quick response, the efficiency (90% at maximum volume) and the level of dynamic the Head One can attain. The extremely high efficiency and the acoustic output of the Head One make this amplifier an integral part of the AER Series, which is dedicated to developing modular amplification equip- ment for electric musical instruments. Please use the included block diagram which describes the most important functions and characteristics. The most important function characteristics are to be found described on the attached block diagram. The Head One contains one signal input and two corresponding pre-amplifiers. The sensitivity of all signal levels can be controlled using the Pad ans Gain 1. Parallel to this signal path is a further Pre-Amplifier. This is controlled the Pad and/or Gain 2 and together with a Tube Emulation creates a distorted sound that can consequent- ly be added to the clean sound using the Mix control. Harmonics and Tone influence the type and frequency response of the created distortion. The Mute switch switches off the amplifier and all Outputs except the Tuner Output. The signal progresses further to two Equalizer Stepps which can be selected by a switch, or can be bypassed by a secondary switch. Consequently one has the opportunity to select be- tween two seperate sound settings.. The DI Output has a seperate signal control. It's possible to access the signal before or after the EG by using the Pre/Post EQ switch. Following that is a Send/Return circuit (i.e. for Effects) to enable signals to added either in parallel or in series. The next Sound Control (Sparcling Filter) influences the whole signal in the area of Bass and Treble, through a type of Sound Scales and an intensity knob. Using two selectable Master Controls (i.e. for Solo or Ensemble level) the signal is passed on to the Line Out and an analogue Signal Controller. This stops overloading of the power amplifier, allowing an optimal allignment of the connected loudspeaker from the AER Bottom Line Section. A maximum of two footswitches can be connected allowing remote control of the following functions: • Gain2 or Tube Emulation on/off (can be connected to the Ma- ster and/or EQ-switching, via a Jumper. Factory setting is with- out connection) • Equaliser 1 or 2 selection • Master 1 or 2 selection • Effect circuit on/off The Power Amplifier is a 2 channel digital amplifier that can be used in 3 different modi: 1. 2-Ch Mode: As a Fullrange Amplifier driving 2 full-range loudspeaker boxes 2. 2-Way Mode: As a 2-Way active amplifier with one output for a Bass Loudspeaker Cabinet and one for a High/Mid Cabinet. 3. Bridge Mode: As a bridged amplifier for a higher output level for use with a full-range cabinet (only recommeded for use with an 8 Ohm cabinet) The active crossover, neccessary for 2-way operation, can be found before the power amplifier in the signal path. The Bass and Treble signals can accessed at line level outputs, thereby allowing connection to external amplifiers with louds- peaker systems or active loudspeakers. A switched power supply supplies the power amplifier with con- stant working and the neccessary energy. Extensive protection switching helps to protect the operating parts against damage caused by incorrect operation or opera- ting conditions.

gain 1 Controls the proportion of input signal (preamplification) clip Indicator of input distortion mute Mutes channel drive: gain 2 Controls the preamplification of the ‘drive’ channel harmonics Control to alter the characteristics of the distortion tone Controls the treble content of the ‘ drive’channel off/on On/off switch for the distortion mix Controller to mix 'gain1' and 'gain2' together tone: balance High/Low sound balance intensity Controls the content of the sound balance master: ensemble / Master 1 solo Master 2 DI out Balanced DI output DI level DI output contol pre/post DI Pre or post tone control 4. Operating controls Front panel, from left to right: eq: bypass select Selects between EQ 1 and EQ 2 equalizer 1: active LED indicates that EQ1 is in operation colour Mid-cut high boost switch bass Bass tone control low mid Low mid range control middle Mid range control treble High range control equalizer 2: active LED indicates that EQ2 is in operation colour Mid-cut high boost switch bass Bass tone control low mid Low mid range control middle Mid range control treble High range control fs eq 1/2 Jack socket for a foot switch to switch between equalisers fs ensemble/solo Stereo Jack socket to switch between Masters (Tip = master solo, Ring = master ens.) power Power on/off switch gain 1 pad tone off / on harmonics » mute solo ensemble DI DI-level power pre/post clip gain 1 power on gain 2 » eq » equalizer 1 … AER_Bottom Line » tone » mix » master » drive » input » Head one select colour bypass active colour active select / harmonics effect on / off » equalizer 2 bass treble middle low mid bass treble middle low mid » eq balance intensity temp boost amp on gain 2 » fs eq 1 / 2 » fs ensemble / solo Upper row: Lower row:

tuner Tuner output excluding tone control or effects line Output, including Master with tone controls, effect, stereo return of external effects highpass At this output is a high-pass signal, regardless of the operating mode of the Head One. lowpass At this output is a low-pass signal, regardless of the operating mode of the Head One. (When the 2-way mode is used, a high-pass signal only is available all loudspeaker outputs) return Return signal from external effect units send Sends the pre-amp signal to external effects return level Controls the amount of return signal from external effects Par/ser switch Select switch for external effects, whether insert mode is in parallel or series mode: full-range see illustration 2 way active see illustration bridge mode As a bridged amplifier for a higher output level for use with a full-range cabinet (only recommeded for use with an 8 Ohm cabinet) out 3 Loudspeaker output (Rmin = 8 Ohm) delivers full-range signal in bridge mode out 2 Loudspeaker output (Rmin = 4 Ohm) delivers full-range signal in Bridge Modus or high-mid signal in 2-way-mode out 1 Loudspeaker output (Rmin = 4 Ohm) delivers full-range signal in Bridge Modus or bass signal in 2-way-mode powercon Connection to mains fuse Fuse 6,3 Ampere gnd Protective earth conductor Head one tuner highpass return line lowpass send return level par ser fullrange 2 way active 2 channel bridge out 3 out 2 out 1 powercon fuse gnd mode Preamplifier Amp 1 Amp 2 CAB one CAB one Preamplifier CAB one CAB two Amp 1 Lowpass Amp 2 2-Way-Active out 2 out 1 out 1 out 2 2 Channel Full-Range mode Highpass -5-

out 1 out 2 out 2 out 1 head one Head one -6- out 1 Full-range mode 2-way-active Applications: CAB one head one out 2 out 1 CAB one CAB one head one out 1 CAB two head one CAB two CAB two head one CAB one CAB two 2-way-active plus head one out 2 CAB one CAB one lowpass 2-channel amplifier CAB two CAB one switch mode: 2-way switch mode: full-range switch mode: full-range switch mode: full-range out 1

Mode input Input: 1/4" unbalanced Senstive: -26 dbV Pad: -15 dbV Output: 1/4" unbalanced Tuner: 1.3V , 100 Ohm Line out: max. 1.4V (post master) Eff. send: max 1.2V Output: XLR DI-out: einstellbar 60-240 mV, balanced Output: powercon HF, LF, full-range signal EQ 2: Out 1: 250/4 Ohm (single ended) Out 2: 250/4 Ohm (single ended) Out 3 Bridge-mode: 500/8 Ohm Colour: -3dB / 300Hz +7dB / 4 kHz EQ 1: Bass: +/- 9 dB / 45 Hz Low Mid: +/- 9 dB / 240 Hz High Mid: +/- 9 dB / 880 Hz Treble: +/- 9 dB / 7.2 kHz EQ 2: Bass: +/- 9 dB / 45 Hz Low Mid: +/- 9 dB / 420 Hz High Mid: +/- 9 dB / 880 Hz Treble: +/- 9 dB / 7.2 kHz Weight: 6 kg Dimensions: 88 x 366 x 306 mm

German Registration Office, EAR, under the WEEE registration number DE2631529 EU, Norway, Iceland and Liechtenstein In the European Union, Norway, Iceland and Liechtenstein, disposal of electrical refuse together with domestic refuse is not allowed. All AER GmbH electrical equipment relevant to the WEEE regu- lations, manufactured since 13.08.2005, has been supplied with a crossed waste bin sign. This sign denotes that the equipment may not be disposed with the domestic refuse. This is also valid in Norway, Iceland and Liechtenstein. Publication in this form has been required since 13.08.2005. The European regulations of WEEE have been implemented in the national laws of all European countries. Because of this we are unable to offer standard disposal solutions. The distributor or importer in a particular country is responsible for abidance of the countries regulations, and is must thereby be responsible for the disposal of old electrical equipment, according to the national laws. For other Nations For professional disposal of old electrical equipment, please refer to your local distributor or the relevant authority. 7. Regulations for Disposal Regulations regarding the disposal of old electrical equipment. It is not allowed to dispose of old electrical equipment together with domestic refuse. Old AER GmbH electrical equipment should not be disposed of at public electrical refuse disposal centres. The company AER GmbH is solely responsible for the disposal of old AER GmbH electrical equipment, which is marked with the sign of a refuse bin. Before disposing of old AER GmbH electrical equipment carry- ing a refuse bin sign, please contact us. We will take care of a professional and self-financing disposal. For old AER GmbH electrical equipment not carrying a waste bin sign, the owner is responsible for a professional disposal accor- ding to legislation. In this case we will gladly help you and recommend a professio- nal disposal contact. By calling us on +49 (2361) 89 17 89, we can give you qualified information regarding the disposal of old AER GmbH electrical equipment. Declaration: The EU directive regarding the disposal of electrical equipment, (WEEE,22/96/EC) has been implemented according to the law. All AER GmbH electrical equipment relevant to the WEEE regulations, manufactured since 13.08.2005, has been supplied with a crossed waste bin sign. This sign denotes that the equipment may not be disposed with the domestic refuse. Publication in this form has been required since 13.08.2005. A www.aer-amps.com HeadOne_E_01/07