MODEL CS 208 v2
OPERATIONAL & APPLICATION NOTES
MAY 2003
21
Inputs:
XLR In:
Transformer balanced input. Nominally Pin 2 high. (Pin 3 - low, Pin 1 - ground).
Channel Power:
To conserve current consumption, switch off unused channels. Do not switch
during recording.
Mic Power Select:
Mic power off. For example, dynamic and radio microphones. T-power / AB
power = Unbalanced microphone powering, nominally Pin 2 is positive, for use
with unmodified European microphones. XLR must be reversed for ‘red dot’
microphones. Phantom power = Balanced powering, positive DC voltage on
both Pins 2 and 3, normally set for 48v (See application note AN 2C v.2).
Do not switch to 48 volt with 12 volt phantom microphones.
Phase:
This affects audio phase only (ie: does not control the T-power polarity).
N (normal) = Pin 2 high. R (reverse). It is important that the phase of the
microphones are matched to avoid phase cancellation. Absolute phase
throughout the system should also be maintained.
Mic / Line:
Up = Mic, Down = Line. 40 dB pad.
Pad:
15 dB pad, effective in both mic and line positions.
For typical SPL (sound pressure levels) pads are not necessary due to the high
system headroom. The use of pads will degrade the signal to noise ratio if used
within the range of the microphone gain trim. 40 dB pad may be used for
balanced line level signals.
HP1:
Pre transformer filter (100 Hz, 6 dB/oct) for use where very high level, low
frequency signals may saturate the transformer and pre-amplifier. In general,
because of the very high saturation point of the Jensen Transformers (-6 dBu at
20 Hz), this filter is rarely necessary.
HP2:
Is a post preamp filter. (70 Hz, 12 dB/oct) Sharp roll-off below 70 Hz to reduce
microphone handling noise and other low frequency disturbances. It is
recommended to use this for dialogue recording as the bandwidth of interest
normally exceeds 100 Hz.
EQ:
Hard bypass switch does not affect H.P. filters. EQ-H.F. = (High frequency ,
shelving response) Used to increase / decrease ‘brightness’ of signal. (eg: to
reduce sibilance.) EQ-M.F. = (Mid frequency) Center frequency variable from
500-5 kHz. (eg: May be used to increase ‘presence’) EQ-L.F. = (Low frequency,
shelving response), may be used for a more gradual tapering of low frequency
signals.
ABCD:
Assigns channel to ABCD mix busses.
‘L’ & ‘R’ indicate pan pot and monitor assignment.
Summary of Contents for CS 208 V2
Page 9: ...MODEL CS 208 v2 CSST STEREO MODULE MAY 2003 7 Overload indicator...
Page 14: ...MODEL CS 208 v2 MAY 2003 BLOCK DIAGRAM 12 INPUT POWER...
Page 15: ...MODEL CS 208 v2 BLOCK DIAGRAM MAY 2003 13 MONITOR OUTPUT...
Page 16: ...MODEL CS 208 v2 MAY 2003 EQ CHARTS 14...
Page 17: ...MODEL CS 208 v2 LAYOUTS MAY 2003 15...
Page 18: ...MODEL CS 208 v2 MAY 2003 LAYOUTS 16...
Page 19: ...MODEL CS 208 v2 LAYOUTS MAY 2003 17...
Page 20: ...MODEL CS 208 v2 MAY 2003 CSST LAYOUTS 18...
Page 21: ...MODEL CS 208 v2 Basic SET UP METERING MAY 2003 19 OPERATING GUIDELINES...
Page 28: ...MODEL CS 208 v2 MAY 2003 AN 1 v2 REMOTE ROLLS 26...
Page 29: ...MODEL CS 208 v2 AN 2A INPUT CHANNEL OPTIONS MAY 2003 27...
Page 34: ...MODEL CS 208 v2 MAY 2003 32 AN 3 v2 COMMUNICATIONS IN MULTIPLE INPUTS...
Page 35: ...MODEL CS 208 v2 CABLE WIRING SUGGESTIONS MAY 2003 33...
