Compressor - AER amp one User Manual

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.
max
mid
min
100 Hz
balance in left position
A turning to the right (Fig. 3) affects an increase in treble
whilst at the same time reducing the bass.
max
mid
min
100 Hz
balance in right position
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.
8
frequency
1 kHz 10 kHz
1 kHz 10 kHz
frequency
In use the signal level change can be kept constant at
a set ratio from a set threshold. The following figure
illustrates the correlation.
dB
Fig. 2
threshold
1
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.
Fig. 3
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 (
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.

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.
1
IN
ratio 1:1
ratio 2:1
ratio 4:1
∞
ratio : 1
dB
∞
)
ratio : 1