6
Just like the
gain
control, the
high/low
switch (attenua-
tor de-/activation) also serves to adjust the signal. Start
at
high
with the switch not pressed down. If the in-
put signal is too strong and you cannot avoid clipping
even when you adjust with the
gain
control, then se-
lect the
low setting
.
When you have adjusted the sound level, then you
can set the desired final volume with the
master
con-
trol.
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 sa-
fety symbols are printed
on the rear side of the
unit.
Connect all cables as desi-
red and switch the amplifier on. The green
power
control LED indicates operational 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 com-
ponents of a unit (e.g.
equalizer
,
tone balance
,
com-
pressor
).
Consequently, care must be taken that no part of the
circuit is overloaded or that distortion is unintentio-
nally added to the signal. We have carefully designed
the circuit to achieve this objective whilst also provi-
ding controls (
gain
,
master
,
level
) for manual interven-
tion.
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 ad-
justing the level.
Turn the
gain
control clockwise until the red
clip
indi-
cator 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 amp-
lifier 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 opti-
mal and distortion-free performance.