User manual

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 inuence 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 gure
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 mufed and the over-
all signal level becomes quieter. This difference in level
can mostly be compensated by increasing the master
setting without any difculty. Then the signal is louder
and more compressed in total, because soft and loud
signals come closer together.
For a compression ratio of „innite“ 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 kHz100 Hz 10 kHz
max
min
mid