d&b audiotechnik XSLi12 Handmatig - Pagina 9

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Frequency response correction of the HFC function*

*schematic diagram

XSLi8 isobar diagram horizontal

d&b XSLi8/XSLi12 Manual 1.1 en

HFC function (Line/Arc setups only)

Selecting the HFC (High Frequency Compensation) function

compensates for the loss of high frequency energy due to air

absorption when loudspeakers are used to cover far field listening

positions.

The HFC function has two settings (HFC1 and HFC2) for different

distances the cabinets need to cover. The settings should be used

selectively; HFC1 compensates for 30 m (100 ft) and HFC2 for

60 m (200 ft) of additional distance from a reference position.

The compensation is adjusted for a typical relative humidity of

50 % at 22 °C. With lower humidity the absorption by air

increases, therefore the distances where the respective HFC setting

provides a correct equalization are shorter than indicated above.

Using the HFC function provides the correct sound balance

between close and remote audience areas, whilst all amplifiers

driving the array can be fed with the same signal.

2.4 Dispersion characteristics

The graphs below show the horizontal dispersion angle over

frequency plotted using lines of equal sound pressure (isobars) at

–6 dB and –12 dB. The nominal horizontal dispersion of 80°/

120° is maintained over the entire operating bandwidth.

XSLi12 isobar diagram horizontal