EAW UX8800 Owner's Manual download pdf (Page 28)

7.5.5 LISTENER DISTANCE AND AIR LOSS PRE-EMPHASIS

IMPORTANT !!

In order for the Air Loss Pre-emphasis to be effective, the ambient temperature and

humidity values MUST be manually entered using the UTIL menu on the UX8800's

front panel. (See Sections 5.3.4 and 5.3.5.)

If enabled, scroll through and set the Listener Distance (1 m to 256 m) from the array to the closest part of

the audience area covered by the portion of the array to which the pre-emphasis is applied.

The Listener Distance is a parameter of the Air Loss Pre-emphasis filter that compensates for high

frequency air loss over distance. The parameters of this filter are calculated from the user-entered ambient

temperature, relative humidity, and listener distance.

While only a single distance is entered for the Air Loss Pre-Emphasis Filter, the audience covered by a

given portion of an array or loudspeaker will vary in distance from the array. The

recommendation for setting the distance to the closest listeners in this area

is because there is far lower listener tolerance for excessive

brightness than a lack of brightness. Thus, if the

distance is set for the closest part of the

audience area covered by the filtered

portion of the array or loudspeaker,

then the more distant listener will

hear less bright sound. However, if

the distance is set for audience further

back in this area, then the sound for the closer

listeners in this area will be excessively bright and likely annoying. In any case, you can adjust the

brightness to taste by adjusting the distance parameter.

NOTE: To bypass the Air-Loss Pre-emphasis filter: s

et the Listening Dist to 1 m.

7.6 LEVEL (Input Channels A to D)

Use the LEVEL function to set Input Channel gain and polarity by selecting the A to D buttons.

Level: Scroll through and select the gain up to +/- 15 dB in 0.1 dB steps.

Polarity: Select the polarity: + or -.

7.7 X-OVER (Input Channels A to D)

7.7.1 HPF FREQ AND LPF FREQ

X-Over HPF (if enabled): scroll through and select the frequency. The range will depend on the

particular loudspeaker model. This setting affects the entire loudspeaker.

X-Over LPF (if enabled): scroll through and select the frequency. The range will depend on the

particular loudspeaker model. This setting affects the entire loudspeaker.

The X-Over HPF and LPF filters are typically used in either of two ways.

1. Stand-alone Loudspeakers and Arrays:

For full-range loudspeakers and subwoofers, the LF subsystem has an HPF enabled that

is set to protect the loudspeaker from excessive LF signals that are below its operating

range. Normally, leave HPF settings at their default values. This is always a 12 dB per

octave Butterworth filter.

For applications such as voice-only, fill usage, and similar, set a higher frequency HPF

to restrict unwanted low frequency signals. This automatically changes the HPF filter

from its normal 12 dB per octave Butterworth filter to a more appropriate filter, most

commonly a 24 dB per octave Linkwitz-Riley filter.

For subwoofers an adjustable LPF, 24 dB per octave, Linkwitz-Riley is enabled for their

low-pass crossover filter.

Page 18

AUDIENCE AREA COVERED BY PORTION OF THE ARRAY OR

LOUDSPEAKER WITH AIR LOSS PRE-EMPHASIS APPLIED

INITIALLY, SET THE LISTENER

DISTANCE TO THIS DISTANCE

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 39 40

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EAW UX8800 Owner's Manual Page 28

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