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4.0 Preparing EVF and EVH Systems for Installation (cont')
Figure 12:
An EVH hard foam waveguide contour
being removed for reorientation
4.5 Digital Signal Processing
4.51 Full-Range Systems in Passive Mode
For full-range systems in the passive mode, the internal crossover/equalizer network sends low frequen-
cies to the woofer and high frequencies to the compression-driver/waveguide combination. In addition,
the network tailors the frequency response and levels of each individual driver so that the overall frequen-
cy response of the loudspeaker is essentially flat over its design operating range.
Once a cluster of EVF and/or EVH systems is installed in a venue, a digital signal processor (DSP) will
typically be used to adjust the in-room frequency response, based on the specifics of the situation. In
addition, the DSP should be used to provide the high-pass filters recommended to protect EVF and EVH
systems against overdrive at frequencies below their operating range. Failure to do so could damage the
low-frequency drivers if fed high-level signals below the system's operating range. Table 3 shows the
recommend high-pass filter frequencies for infrasonic protection of EVF and EVH systems. Different high-
pass filter frequencies are recommended for some fiberglass versions based on changes in operation
range due to the effects of having a sealed enclosure.
Model(s)
EVF-1122/XX
EVF-1152/XX
EVF-1121S
EVF-1151S
EVF-1181S
EVF-2121S
EVF-2151D
EVH-1152/XX
Recommended high-pass frequencies for infrasonic protection of EVF and EVH systems
Electro-Voice EVF/EVH User Manual
Recommended High-Pass Frequency (minimum)
65 Hz
45 Hz (55 Hz for Fiberglass Versions)
50 Hz (55 Hz for Fiberglass Versions)
35 Hz (45 Hz for Fiberglass Versions)
33 Hz
45 Hz
35 Hz
60 Hz
Table 3:
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