AER amp three Bedienungsanleitung Seite 14

4. Starting up
4.1 Cabling and Switching on
Before connecting to the 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 printed
on the rear side of the unit.
Connect all cables as desired and switch the am-
plifier on. The green power control LED indicates
operational readiness.
4.2 Level Adjustment
Note:
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 components of a unit (e.g. equalizer, tone
balance, compressor).
Consequently, care must be taken that no part of
the circuit is overloaded or that distortion is unin-
tentionally added to the signal. We have carefully
designed the circuit to achieve this objective whilst
also providing controls (gain, master, level) for
manual intervention.
First ensure, that the mute switch is deactivated and
the master level control is zeroed (over to far left),
so that the signal passes through the electronics
but does not reach the loudspeaker, while you are
adjusting the level.
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 level.
An illuminated clip-LED indicates an overload.
A short flicker is 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
achieve an optimal and distortion-free performance.
Just like the gain control, the high/low switch (attenu-
ator de-/activation) also serves to adjust the signal.
Start at high with the switch not pressed down. If
the input signal is too strong and you cannot avoid
clipping even when you adjust with the gain con-
trol, then select the low setting.
When you have adjusted the sound level, then you
can set the desired final volume with the master
control.
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5. Functional Characteristics
5.1 Mute
The mute switch turns the appliance to mute as
required. The function can also be activated by a
standard footswitch (on/off switch).
5.2 Tone Control Networks
As with all AER products, the amp three is fitted
with an excellent basic tone thanks to the selection
of components, circuits and pre-equalizations.
In addition, various equalizer networks enable
you to adjust the basic tone to suit your personal
requirements. With amp three you can activate fixed
filters (colour, bass boost) and two adjustable filter
networks (equalizer and tone balance).
Note:
Basically, instruments reproduce their typical
frequency spectrum, but this is not necessarily what
you want, or there are some sounds you want, which
the instrument doesn't „naturally" reproduce or can
play, but not in the appropriate ratio. There are all
kinds of electronics can make these things possible,
but in certain circumstances the price you have to
pay can be a bad signal-to-noise ratio.
5.2.1 Colour
The colour switch activates a fixed, pre-set contou-
ring „voicing"-filter, which reduces mids slightly at
360 Hz and strongly emphasises trebles at 3.8 KHz.
5.2.2 Bass Boost
The bass boost strengthens the low frequencies at
55Hz. This gives the amp three enormous sound
pressure, so that it produces rich bass tones both
when it is placed on the ground and on a stand.
5.2.3 Parametric Equalizer
With the amp three 3-band equalizer, bass and
treble are fixed, the sensitive mids band can be
adjusted in the frequency range of 200 Hz to 2 kHz.
The bandwidth is adjustable between 1 octave
resp. 1.6 octaves. It remains constant whatever the
selected frequency.
Note:
A parametric equalizer is a filter network in which
all the parameters of a filter (amplitude/level i.e.
increase or decrease; frequency i.e. tone pitch, Q-
factor/bandwidth i.e. filter quality) are adjustable.
The parametric equalizer enables you to equalize
frequency response errors. On the other hand you
can use it as a flexible tool to change specific tones.
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