Labo
★
K
Effects –
www.labo-k-effects.com
–
5
Preampli module
Input section :
1)
The microphone sensitivity control
gives gain steps of 10dB
.
The front panel
legend gives overall channel strip gain the signal is attenuated by -16dB by the
input section so that a signal input of OdBu gives a pre-fade level of -16dBu.
·
Positions 1,2 and 3 of the control switch in a 30dB pad which with the rotary
control gives the required attenuation.
This pad is bypassed by a relay for higher
selected gains.
The input transformer is configured to give a 12dB step-up ratio.
When switching from 4 to 3 and vice versa (the pad changeover positions), the
signal path is muted before the relay state is changed.
2)
Line sensitivity control gives a -12dB to +8dB gain contol by 2dB steps (switched)
or via a potentiometer according to the version.
3)
Microphone Trim control gives a ±10dB trim of the microphone gain and has a
logarythmic characteristic.
4)
« LINE » switch allows to select input source, Micro or Line.
5)
« PHASE » switch inverts phase of both Micro and Line signals. When pressed, the
output is out of phase with the input and the phase Led lights.
6)
« OD » switch cap is replaced by a red one. This switch allows (after Labo K’s
mod) to activate the 48V phantom power. A yellow Led indicates the presence of
this power.
Filter section:
When either filter is selected the filter LED is turned on
.
1)
High pass filter
= 4 pole Butterworth w
i
thout of
band attenuation of 24dB/octave.
3 dB down point is marked on rotary control.
2)
Low pass filter = 2 pole Butterworth (12dB/oct). 3 dB down point is marked on
rotary control.
Préampli Filtres Dynamics
