Functional Characteristics; Mute; Tone Control Networks; Colour - AER amp one User Manual

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.
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)
max
mid
min
100 Hz
balance in middle
(flat)
frequency
1 kHz 10 kHz
Fig. 1
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