8
If you turn the
balance
control to the left (Fig. 2), the
bass range is further increased, but the treble is decrea-
sed by max. 0dB.
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 deli-
berately designed as a somewhat „different“
equalizer
.
It offers a comfortable way of giving the original signal
more zip without distorting it. Especially on those occa-
sions, when the
equalizer
has to be used to suppress re-
sonance or feedback.
5.3 Compressor
A compressor is an electrical
circuit (a device) which you
can use to influence the dyna-
mic 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
– there-
fore: no compression.
A compression of e.g.
ratio 4:1
means that further in-
crease in level above the
threshold
will be 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 over-
all 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, because 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 limi-
ting. Die AER compressor switch here offers compressi-
on ratios of 1:1 to 5:1.
dB
ratio 2:1
ratio 4:1
ratio
∞
: 1
ratio 1:1
dB
OUT
IN
1
1
threshold
Fig. 3
level
frequency
intensity
balance in right position
1 kHz
100 Hz
10 kHz
max
min
mid
level
balance in left position
frequency
intensity
Fig. 2
1 kHz
100 Hz
10 kHz
max
min
mid
