AER amp three Bedienungsanleitung Seite 15

5.2.4 Tone balance
The tone balance is served by the two controls
balance and intensity. The intensity control
determines the degree to which bass and treble
are increased simultaneously and are mixed to the
original signal (parallel mode). If the intensity control
is far over to the left (min), then the original signal
max
mid
min
100 Hz
1 kHz
middle
balance in
to the original signal.
The balance control influences the relationship bet-
ween bass and treble. If it is in middle setting, bass
and treble are balanced. The tone balance is now in
equation. If you turn the balance control to the left
max
mid
min
100 Hz 1 kHz
left position
balance in
A turning to the right (Fig. 3) affects an increase in
treble whilst at the same time reducing the bass.
In its function and signal path the tone balance is de-
max
mid
100 Hz 1 kHz
balance in right position
is not in-
fluenced
(flat). Tur-
ning the
control to
the right
(--> mid
--> max)
(flat)
mixes the
10 kHz
frequency
relevant
bass and
Fig. 1
treble mix
(Fig. 2),
the bass
range is
further
incre-
ased,
but the
treble is
decrea-
frequency
10 kHz
sed by
max.
Fig. 2
0dB.
liberately
designed
as a so-
mewhat
„diffe-
rent"
equa-
lizer. It
offers a
comfor-
10 kHz
table way
frequency
of giving
Fig. 3
the original signal more zip without distorting it.
Especially on those occasions, when the equalizer
has to be used to suppress resonance or feedback.
5.3 Compressor
A compressor is an electrical circuit (a device) which
you can use to influence the dynamic behaviour of a
signal. The aim can be, for example, to minimise the
risk of distortion. In use the signal level change can
be kept constant at a set ratio from a set threshold.
The following figure illustrates the correlation.
On axes the input level (X axis = IN) and the output
level (Y axis = OUT) are shown in dB.
Along the 45° line the input and output levels are
the same – that means a compression (ratio) of 1:1
– therefore: no compression.
A compression of e.g. ratio 4:1 means that further
increase in level above the threshold will be
dB
1
1
maintained at a constant ratio of 4:1. In other words:
if the input level increases by a factor 4, then the
output level only increases by a factor 1.
This means that loud signals are muffled and the
overall signal level becomes quieter. This difference
in level can mostly be compensated by increasing
the master setting without any difficulty. Then the
signal is louder and more compressed in total, be-
cause soft and loud signals come closer together.
For a compression ratio of „infinite" to 1
(ratio ∞ : 1) we no longer talk about compression,
but about limiting. The AER compressor switch here
offers compression ratios of 1:1 to 5:1.
ratio 1:1
ratio 2:1
ratio 4:1
∞
ratio : 1
IN
dB
15