d&b audiotechnik Ti10 Podręcznik użytkownika - Strona 8
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Frequency response correction of the HFC function
Frequency response correction of the CPL function
8
HFC function (Ti10L Arc/Line setups only)
Selecting the HFC (High Frequency Compensation) function
compensates for loss of high frequency energy due to absorption
in air when loudspeakers are used to cover far field listening
positions.
The HFC function has two settings (HFC1, HFC2) for different
distances the cabinets need to cover. The settings should be used
selectively; HFC1 for cabinets covering distances larger than 25 m
(80 ft) and HFC2 for those covering distances larger than 50 m
(160 ft).
The compensation is adjusted for a typical relative humidity of
40 %. 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.
CPL function
The CPL (Coupling) function compensates for coupling effects
between the cabinets of an array. CPL begins gradually around
1 kHz, with the maximum attenuation below 400 Hz. As coupling
effects increase with the length of the line array, the CPL function
can be set to dB attenuation values between 0 and –9. With
higher attenuation values the corner frequency of the filter shifts
towards lower values.
Positive CPL values create an adjustable low frequency boost (0 to
+5 dB) and can be set when the system is used in full range mode
without subwoofers.
Note: Make sure that all cabinets within the line array are
operated with the same CPL setting.
2.4 Dispersion characteristics
The graphs below show dispersion angle over frequency of a
single Ti10 cabinet plotted using lines of equal sound pressure
(isobars) at –6 dB and –12 dB.
d&b Ti10 Manual 1.2 en