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FULL OPERATING INSTRUCTIONS
Input Sockets
There are two INPUT sockets, one for PASSIVE instruments i.e. those that have no
internal preamp or battery and one for ACTIVE instruments.
The PASSIVE socket has a very high input impedance to perfectly match the output signal
from a passive instrument. This allows the full tonal range of the instrument to be
reproduced without the loss of top end that can be caused by an impedance mismatch.
This input is far more sensitive than the ACTIVE input. This is necessary because PASSIVE
basses generally have a much smaller output signal.
The ACTIVE input is suitable for the lower impedance outputs from instruments that have
their own internally powered pre amp. This input can also cope with the much higher
level of signal that some of these instruments can produce. However should you be using
an active instrument that does not have a very large signal output, then it is perfectly
acceptable to plug this into the PASSIVE input.
Input Gain
To get the best from your amplifier it is important to understand fully the correct use of
the INPUT GAIN and the OUTPUT LEVEL controls.
The optimum setting is achieved when the INPUT GAIN control is set as high as possible
without lighting the red OVERLOAD LED too often. The OUTPUT LEVEL control should
always be set as low as possible to achieve the required playing volume, i.e. the INPUT
GAIN is adjusted for the instrument and left set at the optimum level whilst the OUTPUT
LEVEL is used to make any changes to the overall amplifier volume.
To set these two controls correctly use the following procedure:-
1.
First turn the OUTPUT LEVEL control to zero.
2.
Plug your bass into the appropriate ACTIVE or PASSIVE socket.
3.
Turn all volume controls on your bass up full.
4.
Gradually turn up the INPUT GAIN control while playing your bass as hard as
you are likely to during your performance.
5.
Adjust the INPUT GAIN control so that the red OVERLOAD LED lights up on
playing peaks only.
6.
Now turn up the OUTPUT LEVEL control to give the desired volume.
Please note that if the GRAPHIC EQUALISATION is altered it may be necessary to re-
adjust the INPUT GAIN control.
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