Calrec S2 Operator's Manual page 70

S2
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70
For these rare situations a new techniques in design has been evolved at Calrec which
allows the superb noise figure to be uncompromised for the majority of the time (more
than 99.9%).
Rather than have the headroom available the whole time (with a compromised noise figure)
it is only made available for the brief period of high signal input, by exchanging input gain
for fader gain.
This is in no way a compressor but simply allows the operator to control the gain on his
channel fader up to 36dB input headroom for the duration of the high signal. Pre-fed signals
are in fact limited but they would be drastically overloaded anyway with a signal close to
a normal headroom figure of 36dB.
The circuit/schematic of the technique used for this may be seen in STANDARD CIRCUITS
NO. 19.
5.8 LINE 2 TO AUX 8
This button found on the TONE/TALKBACK panel automatically switches Mono Line 2
inputs and stereo line inputs directly to Aux 8 in lieu of the normal pre/post feeds Aux 7
is immobilised. The Aux 8 Leds confirm the connection.
This allows Aux 8 which is a stereo buss to be used as a multitrack monitor system in
stereo with pan controls from each track.
5.9 TAPE REPLAY
This button found on the TONE/TALKBACK panel switches all channels to Mono Line 2
input and stereo line inputs.
This is to allow multitrack tape replay through the console. The Line inputs are at standard
0dBu level in this condition with no input gain control.
A track may be disconnected from this mode and reconnected to (say) a mic input by
pressing the button marked DUB on the channel.
5.10 SLS/PA INHIBITS
CIRCUIT DESCRIPTION No. 15 refers to this principle.
Basically the Studio Loudspeaker is muted when (& only when) all the following conditions
are met on any channel.
The channel is selected to MIC
The channel is routed to a GROUP or MAIN
The channel fader is off the backstop
The GROUP (if selected) is routed to MAIN
The group fader is off the backstop (if selected)
The main fader is off the backstop
The PA (Public Address System), which is deemed to be Aux 1 or 2, is only energised
when the above conditions are met except for the mic selection.
The PA inhibit is an internal option in the faders.
The system allows PA only to be heard when the console is 'On-Air '.