7
Note:
A
parametric equalizer
is a filter network in which all
the parameters of a filter (amplitude/
level
i.e. increase
or decrease; frequency i.e. tone pitch, Q-factor/
band-
width
i.e. filter quality) are adjustable.
This means that increase and decrease, position and
width of the frequency range can be adjusted inde-
pendently and over a wide range.
In this way, the
parametric equalizer
enables you to
equalize frequency response errors – hence the name
equalizer
– and to combat feedback and resonance ri-
ses. On the other hand you can use it as a flexible tool
to change specific tones.
5.2.4 Tone balance –
How does it work?
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 (paral-
lel mode). If the
intensity
control is
far over to the left (
min
), then the
original signal is not influenced (
flat
). (see fig. above)
Turning the control to the right (-->
mid
-->
max
) mixes
the relevant bass and treble mix 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 equati-
on. (siehe Fig. 1)
5. Functional Characteristics
5.1 Mute
The
mute
switch turns the appliance to mute as requi-
red. The function can also be activated by a standard
footswitch (on/off switch).
5.2 Tone Control Networks
As with all AER products, the
amp three
is fitted with
an excellent basic tone thanks to the selection of com-
ponents, circuits and pre-equalizations. In addition, va-
rious equalizer networks enable you to adjust the ba-
sic tone to suit your personal requirements. With
amp
three
you can activate fixed filters (
colour
,
bass boost
)
and two adjustable filter networks (
equalizer
and
tone
balance
).
Note:
Basically, instruments reproduce their typical frequency
spectrum, but this is not necessarily what you want, or
there are some sounds you want, which the instrument
doesn’t „naturally“ reproduce or can play, but not in
the appropriate ratio. There are all kinds of electronics
can make these things possible, but in certain circum-
stances the price you have to pay can be a bad signal-
to-noise ratio.
In this case the advice is quite simple: in general, go
easy with the many equalizer possibilities. Sometimes
less is more!
5.2.1 Colour
The
colour
switch activates a fixed, pre-set contouring
„voicing“
-filter, which reduces mids slightly at 360 Hz
and strongly emphasises trebles at 3.8 KHz.
5.2.2 Bass Boost
The
bass boost
strengthens the low frequencies at
55Hz. This gives the
amp three
enormous sound pres-
sure, so that it produces rich bass tones both when it is
placed on the ground and on a stand.
5.2.3 Parametric Equalizer
With the
amp three
3-band equalizer,
bass
and
treb-
le
are fixed, the sensitive mids band can be adjusted
in the frequency range of 200 Hz to 2 kHz. The band-
width is adjustable between 1 octave resp. 1.6 octaves.
It remains constant whatever the selected frequency.
Fig. 1
level
max
min
mid
balance in middle
frequency
intensity
1 kHz
100 Hz
10 kHz
(flat)
