Shure DP11EQ Manuel d'utilisateur télécharger pdf (Page 22)

English –

DELAY

There are some potential problems with the arrival of sound in systems utilizing multiple

loudspeakers. The DP11EQ Delay is designed to solve two of these problems: remote speaker

alignment and phase cancellation.

Delay for Solving Remote Speaker Alignment Problems

AMPLIFIER

MIXER

DP11EQ

WITH DELAY

Problem:

Illustration A — Some larger sound systems may utilize loudspeaker fill systems. One

loudspeaker may not be enough for a large hall because of power limitations, so a fill loudspeaker

may be placed farther in front of the main speaker to augment the sound from the main loudspeaker.

This may cause the sound from the fill loudspeaker to arrive at the listener earlier than that from the

main loudspeaker. To the audience, it will seem like the sound is coming from the wrong place when

the sound from the fill loudspeaker arrives first.

Solution:

Illustration B — The delay in the DP11EQ can be used to solve this problem. Place a

DP11EQ along the audio path to the amplifier of the fill loudspeaker, then set it to the proper amount of

delay. The DP11EQ with Delay will hold that audio signal in memory, releasing it to the fill loudspeaker

only when it is in time with the sound from the main loudspeaker, so the sound from both loudspeakers

will arrive at the audience at the same time. Now, the audience will perceive the sound coming from

the correct place.

Delay for Solving Phase Cancellation Problems

AMPLIFIER

MIXER

DP11EQ

WITH DELAY

Problem:

Illustration A — Phase cancellation can occur when two loudspeakers are near each

other but not precisely time aligned. The two speakers can be seen in the illustration above. The

waves represent the sound coming from each. The sound waves coming from the main and remote

loudspeakers are out of phase. Because they are out of phase, the sounds interfere with each other,

degrading audio quality. The illustration above shows how sound waves cross, causing phase

cancellations.

Solution:

Illustration B — The DP11EQ Delay can be used to stall the signal to loudspeaker B

just long enough so that when it does come out, it is in phase with the sound from the loudspeaker A.

When in phase, the waves reinforce each other to maintain audio quality. Illustration B shows how the

DP11EQ delay works in a sound system.

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Shure DP11EQ Manuel d'utilisateur Page 22