FORUM OPERATION AND MAINTENANCE MANUAL 9601
PAGE 25
The Stereo Input module has two stereo input sources. Input A is
for a stereo Microphone, while input B is for a line-level stereo
input, which can be optionally configured as a phono PRIAA
equalised) input by purchasing the RIAA adapter card.
Sum-and-Difference, or MS decoding is provided either at Mic or
line level signals using a combination of the mono and phase
reverse switches.
+48V
Switches 48 volt phantom power to the Mic input A.
INPUT B
Selects the source on the input B connectors. Normally this is a line
input, but may be internally adapted to be a phono input from a
turntable using the RIAA adapter.
GAIN
The Gain control is wide range rotary control, and is active on both
inputs A and B. On input A PMic), the gain is adjustable from 16 to
66dB, while on input B PLine or Phono), the gain range is from -10
to +20dB.
LEFT CUT
This switch mutes the left channel signal, so only the right channel
signal is heard.
RIGHT CUT
This switch mutes the right channel signal, so only the left channel
signal is heard.
MONO
When both Left Cut and Right Cut switches are pressed, the input
signal is combined to give a mono signal, which is fed to both
signal paths through the module.
PHASE REVERSE
Under normal conditions, this reverses the phase of the right
channel.
If both the CUT switches above are pressed, additionally pressing
Phase Reverse will allow the input to be used for MS decoding,
either from a microphone or line level signal.
STEREO INPUT MODULE
