Extron electronic MPX Plus 866 A manual Program audio input signal controls a

PRELIMINARY

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Program audio input signal controls (A)

The program audio input signal processor chain makes adjustments to program audio material before it is tied to specific outputs.

Gain control — The always-present gain control provides the same basic audio input level adjustments that are available from the front panel (see “Viewing and adjusting the input audio level“, in chapter 3, “Operation”).

Additionally, the left and right input channels each have trim controls, accessible in the dialog box, for separate fine adjustment with a gain range of -6 dB to +6 dB in 0.1 dB increments. The default setting is unity gain (0.0 dB).

NThe trim settings are not indicated in the front panel display.

The Polarity buttons, accessible in the dialog box, let you flip the polarity of the wires connected to the audio connectors (+/tip and -/ring) to easily correct for miswired connectors.

The Mute buttons, accessible in the dialog box, let you separately silence the left and right audio channels. If you mute both channels, audio is completely silent on that input. When one or both channels are muted, one or two red indicator(s) in the block turn on.

Filter block — The filter processor block, when first inserted, provides one of four filter selections; additional filters can then be added. A filter attenuates (removes) or boosts a range of frequencies from an audio waveform, while passing other frequencies. Click the desired filter to select it.

NSelecting “Bass & Treble Filter” inserts two separate filters.

Additional filters, for a total of up to three filters, can then be added by double- clicking the processor block. Additionally, each filter’s frequency range can be changed in the dialog box, customized to the filter, that can be accessed by double-clicking the processor block.

To add a second and/or third filter to the filter block, select the desired filter in the 2 and 3 drop-down boxes in the dialog box.

The following filters are available:

•High pass filter — A high pass filter passes a band of

frequencies extending from a specified cutoff frequency (greater than zero) up toward the high-end of the frequency spectrum. All frequencies above the specified cutoff frequency are allowed to pass, attenuating all frequencies below. The default cutoff is 100 Hz.

•Low pass filter — A low pass filter passes a band of frequencies extending from a specified cutoff frequency (less than infinite) down toward the low end of the frequency spectrum. All frequencies below the specified cutoff frequency are allowed to pass, attenuating all frequencies above. The default cutoff is 10 kHz

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