Notes About Constant Voltage Systems - RCF MQ90S User Manual

Set the power (by using a screwdriver) according to the loudspeaker line
voltage (100 o 70 V):
60 W – 30 W – 15 W – 7.5 W [100 V]
30 W – 15 W – 7.5 W – 3.75 W [ 70 V]
- The loudspeaker input voltage (Vd) must correspond to the amplifier
output voltage (Va).
- The sum of nominal power values (Pd x n) of all loudspeakers connected to
the line must not exceed the amplifier power (Pa).
- Make sure all loudspeakers are connected in phase to ensure a correct
audio reproduction
Pa = Amplifier power
Pd = Speaker power
n = Number of speakers
Vd = Speaker input voltage
Va = Amplifier output voltage
Set the commutator (turn it clockwise by using a screwdriver) to the 16 Ω
position.

NOTES ABOUT CONSTANT VOLTAGE SYSTEMS

+
Amplifier
–
Pa > Pd x n Va
-
Vd = Va
SET THE POWER FOR 100 / 70 V
CONSTANT VOLTAGE LINES
-
+
Vd = Va
LOW IMPEDANCE SETTING (16 Ω)
(NOT FOR 100 / 70 V LINES)
-
+ +
Vd = Va
5