EAW UX8800 Owner's Manual
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7.5.5 LISTENER DISTANCE AND AIR LOSS PRE-EMPHASISIMPORTANT !!In order for the Air Loss Pre-emphasis to be effective, the ambient temperature andhumidity values MUST be manually entered using the UTIL menu on the UX8800'sfront 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 ofthe 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 highfrequency air loss over distance. The parameters of this filter are calculated from the user-entered ambienttemperature, relative humidity, and listener distance.While only a single distance is entered for the Air Loss Pre-Emphasis Filter, the audience covered by agiven portion of an array or loudspeaker will vary in distance from the array. Therecommendation for setting the distance to the closest listeners in this areais because there is far lower listener tolerance for excessivebrightness than a lack of brightness. Thus, if thedistance is set for the closest part of theaudience area covered by the filteredportion of the array or loudspeaker,then the more distant listener willhear less bright sound. However, ifthe distance is set for audience furtherback in this area, then the sound for the closerlisteners in this area will be excessively bright and likely annoying. In any case, you can adjust thebrightness to taste by adjusting the distance parameter.NOTE: To bypass the Air-Loss Pre-emphasis filter: set the Listening Dist to 1 m.7 . 6 L E V E L ( I n p u t C h a n n e l s A t o 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 - O V E R ( I n p u t C h a n n e l s A t o D )7.7.1 HPF FREQ AND LPF FREQX-Over HPF (if enabled): scroll through and select the frequency. The range will depend on theparticular loudspeaker model. This setting affects the entire loudspeaker.X-Over LPF (if enabled): scroll through and select the frequency. The range will depend on theparticular 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 thatis set to protect the loudspeaker from excessive LF signals that are below its operatingrange. Normally, leave HPF settings at their default values. This is always a 12 dB peroctave Butterworth filter.For applications such as voice-only, fill usage, and similar, set a higher frequency HPFto restrict unwanted low frequency signals. This automatically changes the HPF filterfrom its normal 12 dB per octave Butterworth filter to a more appropriate filter, mostcommonly a 24 dB per octave Linkwitz-Riley filter.For subwoofers an adjustable LPF, 24 dB per octave, Linkwitz-Riley is enabled for theirlow-pass crossover filter.Page 18AUDIENCE AREA COVERED BY PORTION OF THE ARRAY ORLOUDSPEAKER WITH AIR LOSS PRE-EMPHASIS APPLIEDINITIALLY, SET THE LISTENERDISTANCE TO THIS DISTANCE |
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