Compressor Switch And Rotary Control (7 Band) - TRACE ELLIOT AH1000-12 Guide D'utilisation

Therefore, there is more control in the lower frequencies. Another difference is that each slider
controls a much wider frequency range than normally found. These design differences are in
common with traditional Trace Elliot amplifiers and are part of the sound.
With the controls all set at 0dB (their mid 'click' position), no change is made to the signal. Moving
a slider up will progressively increase, or 'boost', the frequencies centred around the frequency
marked above the slider.
frequencies.
Due to the flexibility and massive cut and boost available, it is important to know how to get the
best from the circuit.
➢ Do not boost or cut all frequency bands. This will have the same effect as increasing or
decreasing the overall volume level without affecting the tonal characteristic of the sound.
➢ Do not use excessive bottom (30Hz to 40Hz) boost on the graphic unless your speakers can
handle it. Very few speaker systems are capable of handling frequencies as low as 30Hz and
40Hz with any degree of efficiency. Boosting at 30Hz, for instance, will not add to the perceived
amount of bottom end in the sound, it will only make your speakers flap to no useful effect. In
fact, boosting at 100Hz or 180Hz will have the apparent effect of adding far more bottom end
than boosting at 30Hz, 40Hz or even 60Hz. The 30Hz slider has been provided on the 12 Band
to allow precise tailoring at very low frequencies. This slider should be used to cut (not boost)
the 30Hz to a level that allows the speaker system to work at its maximum efficiency.
➢ Do not use excessive top (10Hz to 15kHz) boost, this will add mostly hiss to the sound as there
is very little signal output at this frequency from a bass.
➢ Try to keep the graphic sliders balanced around 0dB and in a smooth flowing curve from one
slider to the next, and remember that after adjusting the graphic you may need to re-set the
INPUT GAIN.
The fundamental frequency range of a regular, 4-string bass guitar is from 41.2Hz (bottom E string)
to around 392Hz (two octaves up on the G string) - not a very wide range. Obviously a lot of
harmonics are produced when playing and these can extend up to 5kHz and more.
The attack portion of the note also produces other high frequencies when the string is first struck.
This attack can be emphasised by boosting the top end. However, because of the fairly small range
of frequencies from a bass, by top end we mean between 2.5kHz and 5kHz. You will find that by
boosting at 5kHz the attack will be emphasised, whereas boosting at 1.3kHz and 2.6kHz will bring
out the harmonics in the note. Above this frequency range you will find it is better not to boost the
signal as this will mainly emphasise any hiss present.
If the VALVE circuit on a 12 Band unit is used at quite high DRIVE settings, you will find the
GRAPHIC EQ extremely useful in shaping the overall tone due to having far more precise control
than a simple bass, middle, treble arrangement found on many other amplifiers.

(13) COMPRESSOR switch and rotary control (7 Band)

Pressing this switch will add the COMPRESSOR to the signal chain. The blue LED above the
switch shows its status. It can also be switched on and off using the supplied footcontroller. The
rotary control adjusts the amount of compression applied to the signal; the further clockwise the
control is set, the more the dynamic range will be squeezed.
Moving a slider down will progressively decrease, or 'cut', the
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