Vincent
27
CONNECTIONS FOR THE STANDBY CONTROL
(POWER CONTROL)
Many AV systems or stereo audio systems consist of a multitude of individual components. To avoid the necessity of
switching them on and off before and after every use, many manufacturers have equipped their devices with what
is known as “POWER CONTROL” circuit or “TRIGGER”. This kind of remote-controlled standby circuit is used pri-
marily for preamplifier and power amplifiers. To employ these functions, direct or indirect cable connections must be
made between the preamplifier (or integrated amplifier) and all the devices which support this function. The
“POWER CONTROL” function operates in such a way that each switching on or off of one device in the system (usu-
ally the preamplifier) automatically brings about the switching on or off of all the connected devices which support
this function. Please keep in mind that all devices which respond to the power control are not disconnected from the
mains network when switched off. They are set to a standby state instead. For connecting cables, two-core cables
with 3.5 mm jack plugs (mono) are used. For each connection between two devices one of those cables is needed.
The SP-994 is equipped with two connectors for the power control – one input (INPUT) and one output (EXT) con-
nector. Both allow the amplifier to react to the switching signal and forward it to one more device at the same time.
This main amplifier cannot generate the switching signal for other components on its own!
If the SP-994 main amplifier is to be switched on/off automatically with the preamplifier, then the cable connections
for power control described below must be made correctly and the “POWER” switch (2) must be moved to the swit-
ched off position. If you don’t wish to use this function or if the other components do not support it, all you have to
do is leave out these cable connections.
Connect one POWER CONTROL output of a preamplifier, receiver or integrated amplifier with the socket “INPUT”
(6) of this main amplifier. If this cable is attached, the second connector “EXT” (6) can be used to emit the switching
signal to another POWER CONTROL capable device or it remains free.
In theory it is possible to provide an infinite number of HiFi components with the Power Control signal. For this pur-
pose, on most devices one of the two “POWER CONTROL” connectors may be used as a signal input and the other
as a signal output. This approach, to loop a signal through a chain of components, is commonly referred to as “daisy
chaining”.
SP-994
Preamplifier
e.g. 2. SP-994
Power Control Cable
Attention:
Many devices which can be controlled by a switching
signal (not preamplifiers or integrated amplifiers), have two
terminals which do not differentiate between input and out-
put. In this case either of the two can be selected. Even some
devices that transmit the switch signal (preamplifiers and
integrated preamplifiers) lack this marking. In this case it
may be assumed that they both are signal outputs.
“POWER CONTROL” sockets of preamplifiers or integra-
ted amplifiers must not be interconnected! All receiving
devices must not be connected to more than one pream-
plifier or integrated amplifier (directly or indirectly)!
If a “POWER CONTROL” cable is connected to the back
of the main amplifier and the 12V switching signal is
given, the main amplifier can no longer be switched off
with the “POWER” button. If the power control function is
not desired, the switch signal cable must therefore be
removed!
