Bedienungsanleitung Behringer DEQ2496 (Seite 17 von 22) (Englisch)

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ULTRACURVE PRO DEQ2496

4. APPLICATIONS

The universal concept of the BEHRINGER ULTRACURVE PRO

with its multitude of audio processing functions opens up a whole

range of applications. A few examples with typical settings will

be described in the following.

4.1 Sum-signal equalizer for live applications

This application is the most probable use of the ULTRACURVE

PRO.

Fig. 4.1: The ULTRACURVE PRO as sum-signal equalizer

Please observe a few points to achieve optimum results:

Before you start equalizing the frequency response of your

audio system, we recommend that you listen to uncorrected

music and speech material, which has proven useful in practice:

If distortion occurs, it is liable to be caused by the system and

should be eliminated there.

The setup of the speaker stacks is also important. No equalizer

can substantially improve a sound that is muddied by reflections

from the ceiling and the walls of the room. Often, experiments

with the speaker setup and orientation allow for dramatic

improvements.

In a multi-way system you should also eliminate run-time and

phase differences before equalizing the system (our digital

frequency crossover ULTRADRIVE PRO DCX2496 provides all

functions required for this purpose).

Now its the turn of the DEQ2496. The automatic analyzing

routine (AEQ) helps you find an acceptable basic setting. Make

sure that the measurement microphone is positioned correctly. It

should be located in the direct field of radiation of the system,

and any negative acoustic circumstances should be eliminated.

It is of no use to place the microphone behind a curtain, less than

one meter away from side or rear walls, or on an open balcony,

as this would deteriorate the measuring results. Background

noise must be at least 12 dB below the measuring level to ensure

valid measurements.

Once the system has been analyzed automatically with the

AEQ, the resulting basic setting allows you to fine-tune the

system.

Please note:

A linear frequency response curve is not ideal for all

applications. For example, for speech transmission intelligibility

is the key. As a consequence, the curve should be increasingly

flat towards the low-frequency range, because here the human

voice produces nothing but interference (rumble noise).

Extremely low and high frequencies are usually reproduced

with considerably less energy. There is no point in forcing a

small full-range speaker box to reproduce a frequency response

well below 50 Hz. The best result you can get is the need for

more powerand more money for repairing the speakers.

+ Whenever you set up your audio system, please

always take account of its physical limits.

If time permits, make several measurements with the

measurement microphone at different positions.

Fig. 4.2: Positioning the measurement microphone

Positions 1 and 3 are approx. 1 m on-axis in front of the

speakers, about half the distance between midrange and tweeter

systems. These measurements are used to verify the functioning

of all loudspeakers. Position 2 is located about 2 m in front of the

center of the stage. The measurement should yield roughly the

same result above 250 Hz as the measurements made at positions

1 and 3. Below 250 Hz, the summing of the low-frequency range

should result in a level boost of approx. 3 dB.

Position 4 is located directly in front of the FOH mixing console.

The curve measured here should be the same as at position 2,

however, with a lower level due to the greater distance.

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