ALLDSP PLP428
3.2.5. High Pass Filter
Adjust the high pass frequency by dialing the rotary encoder. You can switch the high pass filter off by dialing
the rotary encoder down (counterclockwise) until the frequency passes 20Hz.
Press the rotary encoder to change the filter type. Select the type by turning the rotary encoder. You can
choose from: Butterworth 6dB, Bessel 6dB, Butterworth 12dB, Bessel 12dB, Linkwitz Riley12dB, Butterworth
18dB, Bessel 18dB, Butterworth 24dB and Bessel 24dB. Higher order filters may be set by adding filter
sections in the PEQ blocks (see below).
3.2.6. Parametric Equalizer (PEQ)
There are 10 bands of parametric equalization. Each band can be adjusted freely over the frequency range of
20Hz to 20kHz. Adjust the frequency by dialing the rotary encoder.
Press the rotary encoder to select the parameters. The available parameters are: Frequency (20Hz to
20kHz), Gain (-12dB to +12dB), Q (0.2 to 25), Enabled (On or Off), Type (Bell, High Shelf, Low Shelf, Notch,
All Pass, Band Pass, High Pass, Low Pass). For the Shelving filters, the Q value sets the steepness of the
filter in dB/Oct.
3.2.7. Compressor
The compressor is a true RMS compressor. Turn the rotary encoder to set the threshold. Press the rotary
encoder to select the parameters. The available parameters are: Threshold, Attack, Hold, Release, Ratio,
and Makeup Gain.
3.2.8. Limiter
The limiter is a zero-attack peak limiter. Only the threshold and release can be set. Press the rotary encoder
to select the parameters. The release value is displayed in dB per second.
3.2.9. Channel Link
By linking 2 channels, the settings are guaranteed to be identical for both channels, except for mixer and
mute. Turn the encoder to set the Channel Link on or off.
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