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SETTING PANEL
SUBSONIC FILTER CUT-OFF FREQUENCY MODIFICATION
Replace FS1, FS2, FS3, FS4 resistors
according to the values in the setting
panel table.
Remark: Cut the new resistors
rheophores according to the
size in the picture.
Procedure:
VCA-VCA1D MODULES INSERTION
LRx 4.300 can accept one of the three optional kits which allow the subwoofer volume remote
control:VCR01K,VCRAK or VCRDK.
These kits have a specific module, VCA or VCA1D, to insert into the amplifier through the setting
panel.
REMARK: Sub volume remote control function is on only when X-OVER switch, in the setting panel, is ON.
Installation:
1 - Remove BYP12 bridge.
2 - Insert VCA/VCA1D module.
- Insertion key. It prevents the module
from being inserted in the wrong way.
This cooling system is specially designed to provide LRx amplifiers with the right working
temperature.
CLK2 should be used when LRx amplifiers work in extremely hard conditions (very low loads) or in
installations where space is too narrow and heat sink cooling is not enough. It consists of two units to
apply onto the amplifier sides; each of them is provided with an electronically controlled fan. Its
intervention depends on a thermal sensor that starts the system as soon as LRx heat sink reaches
45°C. The same sensor is connected to a special circuit which controls the two fans speed progressive
increase when temperature increases, too.
Air flux constant control allows the amplifier very good thermal stabilization and limits noise.
CLK2 – LRx Cooling Kit
ACCESSORIES
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Subsonic filter is pre-adjusted at 20 Hz. In order to modify this value, please act according to what
follows.
