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1.
Do not fully boost just one frequency band, as this will tend to emphasize a small
range of notes on the bass producing a PEAKY and not very usable sound.
2.
Do not boost or cut all frequency bands as this will just produce an overall change
in volume with very little tonal alteration.
3.
Do not use excessive bottom (50Hz) boost unless your speakers can handle it
(very few speaker systems are capable of handling frequencies as low as this with
any degree of efficiency).
4.
Do not use excessive top boost; this will tend to add a lot of hiss to the sound
(especially with ACTIVE instruments).
Useful Observations
The fundamental frequency range of a 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
5Hz or more.
Other frequencies are produced by the attack portion of the note when the string is first
struck. This attack can be emphasized by boosting the top end.
However because of the fairly small range of frequencies produced by a bass, by top end
we mean between 2 and 5 kHz. You will find by boosting at 5kHz the ATTACK will be
emphasized whereas by boosting at 1kHz and 2kHz you will bring out the harmonics in
the note.
Use the 50Hz slider sparingly unless you have a stack of speakers available, and the
power amps to drive them. Rolling off the bottom end by using this slider to give a
degree of cut will allow you to play at a far greater volume level without the speakers
complaining. You will find that boosting at 100Hz will give a greater perceived increase
in bottom end than boosting at 50Hz.
Using The Graphic
Try to keep the slider settings balanced around the 0dB (centre) line on the graphic.
Set the sliders in a smooth, gentle curve, as setting adjacent sliders at opposite extremes
will give sharp peaks and troughs in the sound.
Switch the graphic IN and experiment with the available sounds but remember TOP end
means 1kHz to 5kHz, BOTTOM end means 50Hz and 100Hz and MID range means
250Hz and 500Hz.
N.B. Don't forget to re-adjust the INPUT GAIN setting once you have altered the graphic.
This is necessary because altering the graphic will change the overall gain. The level
indicating circuit monitors the signal to ensure that clipping or distortion is not occurring
at any stage. Consequently changing the gain will change the reading on the LEDs and
you will have to re-adjust the INPUT GAIN control to compensate.
The GRAPHIC may be switched IN and OUT with the GRAPHIC push button switch on
the front panel.
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