CALREC Putting Sound in the Picture 69
The following controls allow
manipulation of mono or stereo
input signals. Should a fader have
a surround path assigned to it, each
mono or stereo leg of this surround
signal may be manipulated by
assigning the relevant leg on the spill
panel.
48V
48V (phantom power) can be sent to
each leg of the input signal using the
48V button (mono) or the 48L and 48R
buttons (stereo). These are located on the
TFT touchscreen.
Polarity inversion
The polarity of the each leg of the signal
may be inverted individually
Input balance
The balance of a stereo input pair can be
varied from +/- 3dB left/right, through
centre stereo.
L>B and R>B
Path leg routing options L>B (left to both)
and R>B (right to both) allow you to route
the left or right legs to both sides of a
stereo channel. With both switches in the
off position the left signal feeds the left
leg and the right signal feeds the right
leg of the stereo path, this is a ‘normal’
stereo setup. Switching on L>B feeds
the left signal to both left and right sides
of the stereo path, and switching on R>B
feeds the right portion of the signal to
both left and right sides of the stereo path.
Switching both switches on sums the left
and right portions of the signal together
and outputs this on both the left and right
legs.
With both switches in the same position,
either on or off, you have access to the
input balance control. When they are
both off the balance control responds as
described above but with both controls
switched on the it is a full range balance
control i.e turning the dial all the way to
the left outputs the left hand signal from
both legs of the path.
With either L>B or R>B switched on
independently, the balance control is
unavailable—it would have no effect as
the left and right portions of the signal
would be the same.
M-S
If the input signal on a stereo input is
presented as an M-S pair it may be
presented incorrectly unless the M-S
decoder is switched in. A button on the
touchscreen toggles the decoder in or out.
SRC
Sample rate conversion may be turned on
if an AES input is selected. The buttons
for this are found in the same location as
the 48v buttons when a Digital Source is
selected.
Signal flow
Fig 2 shows the signal flow of Apollo’s
input section for a stereo input with input
1/2 selection.
Note that it is possible to change
input controls for an I/O box port
which is offline. In this case it is
important that console operators
regularly save the User Memory to
avoid losing settings when the I/O
box comes back online.
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