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Ground Compensated Outputs
The main outputs of the Series 200 are ground compensated, as
already mentioned. When connecting a ground compensated output
to an unbalanced destination, make sure that the cold lead is
connected to earth at the DESTINATION end.(see diagram) The
consideration tor wiring the screen at only one end is not of such
importance with a ground compensated output.
INTERFACE LEVELS
The Series 200 is normally supplied to be compatible with standard
professional equipment, ie. +4dBm (ref. 0.775 volt).
However, provision has been made to allow the user to operate with
semi-professional tape machines etc. which operate at -10dBV (ref.
1.0 volt) or indeed to other levels.
The change in tape interface operating level is accomplished by
reducing the console group output level, and increasing the console
monitor return gain by an equal amount.
The following modification should be made to each output:-
GROUP OUTPUT:
1) Cut track across the position of RX1
2) Add resistor in position RX1. -2.2K ohms.
3) Add resistor in position Rx2. -750 Ohms.
MONITOR RETURN:
For normal Teac/Tascam operating level of -10dBV, R9 and R10
should be changed to 22K ohms.
If returns 5-8 are also to be used at this level, R24 and R25 should
also be changed to 22K ohms.
POWER AMPLIFIERS are often rated at 300mV sensitivity for full
output. In such cases, an attenuator should be installed at the input
to the power amplifier to attenuate the +4dB level (1.228 volt)
coming from the console, by approximately 10-15 dB.
This may be achieved by using a 2.2K ohm series resistor and 680
ohm shunt resistor across the amplifier's input.
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