Dan Dugan Sound Design D-3 - Manual (Page 16)

Dugan Model D-3 User Guide Testing Before Installation
16
The Dugan Speech System can be tested with the following procedure:
1. Switch all channels to speech mode by de-activating the
music system
button.
2. Connect two different oscillators to inputs 1 and 2.
3. Set both to 1 kHz frequency and -20 dBFS output.
4. Fine-tune the frequency of one oscillator so that the Model D-3 gain indicators
bounce up and down at about 2 Hz (1000/1002 Hz).
5. Adjust the oscillator levels so that the gain displays are equal.
6. Leaving one oscillator in input 1, move the second signal to input 3, 4, etc.,
observing the bouncing display. This is a good way to test linked systems.
NOTE: The two inputs mix in the side chain control mix bus. The signal level on this
bus beats between no signal (subtraction) and +6 dB (addition) as the waves
phase against each other. When the two waves cancel in the control mix, both
channels will rise to full. Gains bounce down to -6 dB when the two waves add.
Test the Dugan Music System with the following procedure:
1. Activate each channel’s music system button.
2. Verify that all channels are set to
group a
.
3. Connect one oscillator to the channel 1 input, and the other to the
MT IN A
connector on the rear panel (top-middle connector in Figure 1-1).
Figure 1-1
music system threshold input
connectors