Crest Audio HPW - Manual (Page 46)

ambience inputs
features
The HPW has been designed with a stereo mic ambience input for “real life” sound
enhancement. This feature allows sound from the room to be added to the sound system
allowing better reflection of what the audience hears. The ambience input has direct out-
puts and can be assigned to the auxes or alternate outputs.
gain
This knob adjusts the gain level of the ambience input. Both left and right circuits are
simultaneously adjusted.
balance
This knob determins the signal’s left-right balance. Rotating the control counterclock-
wise increases the amount of left signal, while rotating the control clockwise increases
the amount of right signal sent from the ambience input to the assigned bus.
stereo lo-cut filter
This filter reduces or eliminates unwanted low frequencies without substantially
affecting the program material. Ambient microphones can easily pick up air-handler
or reverberant room noise that clouds the signal. This filter can help clean it up. The
cut-off frequency of the filter is 70 Hz and the slope is -18dB per octave. This type of
filter is also referred to as a Hi-pass filter (HPF). It allows the hi-frequencies to pass
through, but stops the lo-frequencies.
lo cut switch
When the button is in the “OUT” position the stereo Lo-Cut filter is not enabled
When the button is in the “IN” position the stereo Lo-Cut filter is on.
EQ
The ambience Input is equipped with a fixed-frequency, four-band EQ. The HF and LF
bands have a shelving response. The HM band is bell-shaped, centered at 4kHz. The LM
band is centered at 250Hz. The EQ circuitry is always in the signal path. Set all EQ con-
trols to “0” (flat) if no equalization is desired.
high frequency— HF 15dB boost and cut at 10kHz — Shelving Response
high mid frequency— HM 15dB boost and cut centered at the 4kHz, Q of 1.5
low mid frequency— LF 15dB boost and cut centered at the 250Hz, Q of 1.5
low frequency— LF 15dB boost and cut at 80Hz — Shelving Response
PK/Sig LED - Pre-Fader signal (summed L and R) is shown as varying GREEN intensity,
while the channel clip warning illuminates RED.
PFL - When this switch is depressed, the stereo pre-fader signal is sent to the console’s
Solo system. The channel LED illuminates RED to indicate that the PFL is active.
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p. 46
HPW TM owner’s manual
master section