EAW UX8800 Level Input Channels a to D, Over Input Channels a to D, HPF Freq and LPF Freq

7.5.5LISTENER DISTANCE AND AIR LOSS PRE-EMPHASIS

IMPORTANT !!

In order for theAir Loss Pre-emphasis to be effective, the ambient temperature and humidity values MUST be manually entered using the UTILmenu 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
INITIALLY,								is because there is far lower listener tolerance for excessive
	SET								brightness than a lack of brightness. Thus, if the
DISTANCE			THE
	TO				LISTENER
		THIS									distance is set for the closest part of the
				DISTANCE
											audience area covered by the filtered
											portion of the array or loudspeaker,
									TION OF THE ARRAY	OR	then the more distant listener will
											hear less bright sound. However, if
					AUDIENCE AREA		COVERED		BY POR
									-EMPHASIS APPLIED
					LOUDSPEAKER	WITH AIR		LOSS PRE			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 theAir-LossPre-emphasisfilter: set the Listening Dist to 1 m.

7 . 6 LEVEL (Input Channels A to D)

Use the LEVELfunction to set Input Channel gain and polarity by selecting the Ato 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)

7.7.1HPF 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.

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