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Operating Manual - 24.24M Matrix Processor

9. AUDIO FUNCTIONS

Editing of audio controls is done primarily in Protea System Software. Input and output expansion cards are

autodetected, and the software automatically updates to display the current 24.24M status. Note: Accidental, poten-

tially destructive loudspeaker damage can occur when abrupt changes are made to EQ, filter, or level controls, so plan

carefully before making radical changes to a live sound system.

9.1 Input Audio Functions

The following functions are available on all inputs; Mute, Preamp Gain, Input Gain, Delay, EQ, Noise Gate,

Autoleveler, Ducker, and Matrix Routing.

9.1a Input Mute

This turns off the input channel without changing gain settings. When an input channel

is muted, that channel’s red mute LED on the face panel is lit.

9.1b Input Preamp

This determines the up-front analog gain to an input signal. A good rule of thumb is to

allow 20dB of headroom above the nominal input signal level. Clipping occurs at +20dBu, so

a microphone nominally generating a -40dBu signal should have +40dB of gain, a 0dBu line

level input would be set to 0dB gain, etc.

9.1c Phantom Power

+48V Phantom power for condenser microphones can be provided to individual chan-

nels by checking the <+48V Phantom Power> box in the preamp block for a given channel.

9.1d Input Gain

Different from the Preamp block, input Gain adjusts signal level from +12dB to Off.

Due to limitations within the graphical interface, fine tuning gain settings in 0.1dB steps is

accomplished using the <up/down arrows> on the keyboard. Changes of 3dB are quickly

accomplished using <PageUp/PageDown> buttons. To instantly return a gain setting to 0dB,

press <Ctrl + Z>.

9.1e Input Delay

In large installations or outdoor venues there are often many

speakers in various locations to get the best coverage possible. Since

sound travels relatively slow through air (1130 ft/s at 20 deg. C),

multiple loudspeaker locations can create a situation where the origi-

nal audio signal, simultaneously leaving all loudspeakers, arrives at

a single point in the venue at several different times. Needless to

say this causes problems, and what may be crystal clear sound di-

rectly in front of any one loudspeaker can be unintelligible at the farther reaches of the venue

with direct line-of-sound to multiple loudspeaker sources.

The solution is to delay the audio signal to the loudspeakers located further away from

the primary source, so that sound comes out of the distant loudspeakers at the exact time that

sound from the main loudspeakers arrives. Within the Protea 24.24M, up to 682 milliseconds

of time delay are available on each input channel, allowing secondary loudspeakers to be time

aligned with the primary speakers up to 771 feet (235m) away. Set the TEMP text box to the

current air temperature to get the most accurate display of delay distance.

Fine tuning delay settings is accomplished using the <up/down arrows> on the keyboard. Course changes of 1mS

are quickly accomplished using <PageUp/PageDown> buttons. For an explanation of short time delay uses, see section

9.2c.

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Ashly 24.24M Spécifications Page 11

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