16
SIA2-150
4 . 4 O p e r a t i o n
Once connected to mains power and powered up
from the rear panel mains switch, the front panel
Standby button (or remote handset Standby button)
will switch the CA2 between standby and active
mode. In Standby mode the Standby Indicator glows
RED. Operating the Standby function from either
the front panel or the remote handset will switch
the CA2 into active mode. The RED indicator will
extinguish and be replaced by the Input select
indicator showing the current selection in GREEN.
Operating the Standby function again will return the
CA2 to Standby mode.
Inputs are selected by rotating the input select
control in either direction. The control has
continuous movement. When it is moved to the last
input, further rotation will select the first input.
A separate tape loop is included with a Monitor
option selected by a single push button on the front
panel. The tape output will have the same signal as
selected by the rotary input select control. Operation
of the Standby or tape monitor controls will not
affect this output providing mains power is
maintained.
A pair of phono sockets on the rear panel can be
used to drive another amplifier. A further pair of
phono sockets can be used to drive a Sub channel
Amplifier.
Diagram 2 - SIA2-150 front panel and controls
I n t e g r a t e d A m p l i f i e r
A Headphone output is provided via a ¼” Jack socket to drive a variety of popular
headphones. When headphones are connected the signal to the speakers, sub and pre
out is muted.
Output level is controlled by the rotary Volume control on the front of the unit, the
position of which is indicated by a black pointer. Rotating the control clockwise will
increase the output level. It is good practice to lower the volume setting before
switching on the preamplifier or any associated equipment, or while changing the input
selection.
Due to the nature of the electronics in ATC amplifiers it is quite normal for a sound
to be heard from the speaker when the power is applied or disconnected. The noise
heard will not damage the speaker and is quite normal. Although ATC uses the highest-
grade components, a different noise may be heard from each speaker due to slight
tolerance variations in the amplifier components.
