Copyright 2018 - RC Audio Systems Limited
Unit 9 Luccombe Business Centre, Milton Abbas, Blandford Forum, Dorset DT11 OBD
email:-
Page 7 of 8
Tamper Proof threshold adjustments
In some situations where a sound system is to be left unattended, or maybe in an installed venue,
the engineer that carefully set the threshold levels may not want anyone else to adjust these levels
in their absence. For this reason there are some hidden adjustments that can be set on the
LEVELIZA.
Just adjacent to the threshold knobs there are holes in the front panel. These holes are tapped with
a standard M6 thread, and when we supply the LEVELIZA we cap these holes off with a very short
"black M6 dome socket cap screw". If these screws are removed (with a small allen key) then a
preset adjustment can be found inside.
The presets, as supplied, are turned fully anticlockwise into their off position. To set these tamper
proof thresholds:-
1.
Turn the threshold knobs all the way up - this is important,
2.
then (with music playing at desired threshold volume) using a tiny screwdriver turn the
preset adjustment slowly clockwise until the LEVELIZA starts to attenuate, and hence set the
thresholds as required.
3.
Put the security screws back in so that nobody can access the presets.
Once this is done the front panel controls are still fully operational as normal, however the
maximum threshold and hence maximum average volume level that the LEVELIZA will allow to pass
to the sound system is restricted to the levels set on the presets.
There are many different security screws and other screws that require special screwdrivers/tools
available on the market with an M6 thread, so to increase security further the owner can buy their
own unique screws to use instead of the supplied ones cover the presets. However,
the threaded
length must not be more than 4mm
or there is a risk of damage to the preset and/or circuit board
behind the front panel. Of course longer screws can be bought and carefully cut down to under
4mm.
