Labo
★
K
Effects –
www.labo-k-effects.com
–
7
Equalizer module
Equaliser section :
The equalizer is a 4-band type with mid 1 and mid 2 pe
a
king
and low and high bands
peaking or shelving. Each band has
adjustable frequencies and cut
/
boost. The frequency
bands
are overlapping and the cut/boost range is ±17dBs. Low and
high bands have a Q
factor of 0.72 and mid 1 and mid 2 have a Q factor of 2.
Insertion
Equaliseur
Insertion section :
On Neve 51 series consoles, insertion section of mono input channel is fitted on 10882
board on the equalizer module.
This board, named ‘Patch Interface’,
carries two electrically separate stages. A Hi level
VMOS output amplifier (Insertion Send) and a line input stage (Insertion Return).
An
extra +/- 25V psu is required by this circuit. In addition, insertion send and return are
out of phase.
This is due to the fact that phase inversion took place on the active patchbay of the
console.
For this reasons, it was decided to replace this 10882 board by a card that is suitable for
rack mounting the modules.
This board (Labo K Neve 51 Insert and Output) has an insertion output stage (Send)
based on a high quality line driver (SSM2142) witch provides a balanced 4dB.
Insertion return stage (Return) meanwhile is exactly the same fitted on the original
10882 card.
Finally, the buffer output stage of the channel and its gain setting were implanted on this
board.
All the circuits are now working with +/- 16v PSU and send and return are in phase.
