Extron electronic PVS 204SA manual Gain control, Individual channel input sensitivity control

PRELIMINARY

Operation and Setup, cont’d

Gain control

Individual channel input sensitivity control

Individual channel input gain control adjustments are made by rotating the encoder while pressing in the selected input button. The adjustment range is -18 dB to +24 dB, with the default set at 0 dB.

NAdjusting input sensitivity for all inputs ensures that all inputs are at the same level, and at the highest level possible before clipping occurs.

NIndividual channel input gain levels either adds to or subtracts from the overall (global) power amplifier gain level per channel.

Front panel input sensitivity adjustment

NUpon initial power up of the switcher, the amplifier level is automatically adjusted to 50% (0 dB).

To make sure the right input sensitivity is attained, do the following:

1. Press and hold the selected input button for 3 seconds; the input’s LED blinks.

2. While still pressing the input button, rotate the level encoder until the clip LED blinks (see “Clipping indicator” section, on the next page), then rotate it back down until the blinking ceases.

NHaving the audio level beyond the point at which the clip LED flashes results in a distorted output signal (clipping).

3. When the minimum (-18 dB) or the maximum (+24 dB) is reached, the Min/Max LED (see figure 3-6) lights red and flashes for approximately 0.3 seconds.

	AUDIO
	AUX/MIX	LEVEL
This LED lights solid	MIN/MAX	CLIP
when maximum volume
or level is attained.

Figure 3-6 — Front panel audio Min/Max LED and recessed encoders

N If the setting is left at the extreme minimum or maximum, the LED stays on, then extinguishes after approximately a quarter of a second.

Individual gain adjustment can also be made by RS-232 control as shown in chapter 4, “Serial Communication”.

4. Repeat steps 1 through 3 for the other inputs as desired.

Amplifier level control

Amplifier level control is adjusted via the recessed power amplifier level encoder (potentiometer) marked “Level” on the front panel. The encoder has 20 detents (steps) per revolution, each step making a 1 dB change. The adjustment range is -10 dB to +10 dB with the default set at 0 dB. To make adjustments, use a Tweeker or other small screwdriver to rotate the encoder as desired.

NWhen the minimum (-10 dB) or the maximum (+10 dB) is reached, the Min/Max LED (see figure 3-6) lights red and flashes twice, at approximately

a 0.3 second interval. If the setting is left at the extreme minimum or maximum, the LED stays on, then extinguishes after approximately a quarter of a second.

3-6 PVS 204SA Switcher • Operation and Setup