Meters Section:
VU Meter:
Responds to the average program level. The internal oscillator should be set for ‘0’
VU on the meter. This will correspond to +4 dBu on the XLR outputs. As this is an
average responding meter, the peak program level will not be indicated. For digital
audio recorders the line up time on the recorder is set for -18 to -20 dB. The mixer
should still be set up for 0 VU = +4 dBu out. For peak reading meters, the mixer
should still be set up for -8 PPM = +4 dBu out. For feeding external equipment with
VU meters, the level should be set for ‘0’ VU on both the mixer and the outboard
equipment.
PPM Meter:
Peak responding meter. The reference level for a 500 HZ sine wave is set for -8 dB
(+4 dBu on XLR outs). This corresponds to approximately ‘0’ VU, although the
difference between an average responding meter and a PPM meter will vary
according to program material.
Output Faders:
These faders should be left at the maximum position (ie; ‘0’) for optimum headroom
All line-up tones etc., should be made with the faders in this position.
Power; Internal/External:
Switch to internal when using batteries. It is recommended to use alkaline AA cells.
Rechargeable (Nicad cells) may be used with reduced battery life. Pin 3 of power
XLR is the positive charger input. Pin 1 - negative.
Mix. Bus:
These are inputs only. Another mixer output may be inserted at this point to increase
the number of input channels. Note: A resistor needs to be installed in line with each
input. An interface box is available (CSMB) with a ‘D’ connector and four XLR’s with
in line resistors.
Power Supply Suggestions:
An external AC to DC power supply may be connected to Pin 1 (-), Pin 4 (+) of the
XLR-4. The requirements are that output voltage is regulated and filtered, with a DC
voltage level of 12 to 18 volts and a current rating of > 1 Amp. We recommend using
a linear type supply or a very clean switching type. Some switching supplies can
output high frequency noise that can interfere with the internal DC-DC converter and
microphones that have internal converters.
Side Panels:
1/4” - 28 holes are provided for a handle or for mounting the mixer to a cart.
Note: Either the front or the rear holes may be used.
Screws can be up to 1” long (25.4 mm)
In addition, a small recorder tray can be fitted to the mixer.
10
June 2006
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OPERATIONAL & APPLICATION NOTES
MODEL CS306
