II. Installation, Audio Terminations

level before the trim control, preamplifier overload can be avoided. It is best to leave the trim control fully clockwise for normal recording operations.

II.INSTALLATION

A.AUDIO TERMINATIONS

1.Input connections are made via female XLR connectors with pin 2 positive, pin 3 negative and pin 1 ground. 48V phantom power is supplied on pins 2 and 3.

2.Output connections are made via male XLR connectors with pin 2 positive, pin 3 negative and pin 1 ground. If the output is to be used unbalanced, pin 1 should be connected to signal ground and pin 2 to signal hot. Due to the nature of the balanced output stage, pin 3 should be left open for unbalanced operation. See figure below. Note: This will provide a signal of positive absolute polarity when the preamplifier is being used with microphone which produces a positive voltage on pin 2 with positive air pressure on the front of the diaphragm. While a vast majority of microphones conform to this standard a few do not. Use the phase reverse switch to compensate if necessary.

HOT

GND

SHIELD

3 (OPEN)

Figure 1. UNBALANCED OUTPUT CABLE TERMINATION

3.The balanced output driver is capable of driving a matched 600Ω line. This type of termination can be very advantageous for driving very long lines because it provides maximum power transfer through the cable. With a higher power music signal, aberrations caused by distributed capacitance and inductance in the cable are minimized which improves transient performance and harmonic integrity. To create a 600Ω balanced line, simply connect a 301Ω 1% metal film resistor between pins 2 and 3 at the destination end of the cable. This termination combines with the preamplifiers 300Ω output impedance to provide a matched 600W line.

Page 4

201 specifications

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