Peavey PVXp 12 Bluetooth Operating Manual page 20

Loudspeaker System Specifications
From Fig. 5, turn the "Push for DSP" knob four notches CW, and the HPF Filter
band is selected. HPF stands for High Pass Filter, which rolls off low
frequencies. See Fig. 14.
Fig. 14 HPF Filter Band
The default filter frequency is 20 Hz, and the filter type is a 2nd order Bessel.
Normally, there is no need to change this setting, but if the speaker will be used
for speech only, or other limited bandwidth signal sources, or with a microphone
exposed to the wind, or excessively plosive talkers, etc. then raising the
frequency of this filter may be helpful in taming these undesired sounds.
Note that raising the frequency to a value above 20 Hz WILL start to roll-off the
lower frequencies, and limit how low a frequency the speaker system can
reproduce. Setting the filter very much higher than 140 Hz should not be
necessary except in extreme and unusual circumstances.
The range of frequencies it can be set to are from 20 Hz to 400 Hz.
Also note that the entire speaker system is protected by a 36 dB/oct. infra-sonic
filter, and this HPF Channel filter is added on top of that existing filtering.
An example of the HPF set to 50 Hz is shown below in Fig. 15
Fig. 15 HPF set to 50 Hz
Note that CH3, the set of Gain and EQ controls for the Bluetooth® signal source,
does not have this filter available, as most pre-recorded music or sources do not
have very much extreme low-frequency content or opportunity to generate
excessive plosives or mic noises, etc.
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