ALLDSP PLP428
3. Setup And Operation
Before plugging the processor in, always make sure that the power supply matches the product specification
voltage. Install this device on a flat, stable surface, not bent or curved. Do not supply power before all
components of the system are set up and connected properly. Make sure your power amplifiers are switched
on last in order to avoid transients, which could damage your speakers or annoy your audience.
3.1. System Check
After connecting all cables, you should mute all outputs first or turn the gain/level setting on your amplifiers to
minimum. Activate the HF-outputs first. In case of wrong cabling, High Frequency (HF) audio signals will
come out of bass-speakers that cannot be harmed this way. Vice versa, the Low Frequency (LF) audio
signals would destroy your HF-speakers. It is advisable to install a large capacitor in series with HF drivers
(47 - 100 uF). That way, drivers are somewhat protected against accidental instrumentation errors.
3.2. Input Setup
Press the Channel Up or Down button to select the input channel you wish to edit. Make the first settings with
the output turned low or muted.
To toggle through the different items, press the Item Up or Item Down buttons.
3.2.1. Gain
Adjust the gain by dialing the rotary encoder. The gain is adjusted in steps of 0.25dB. Smaller steps (0.01dB)
can be set via the PC or MAC interface.
3.2.2. Input Selection
Select the source (Analog, AES3 or Dante) by rotating the encoder.
3.2.3. Delay
Set the delay time by turning the encoder. Select the displayed unit (ms or s, mm or m, feet, inches, or mils)
by pushing the encoder.
3.2.4. Low Pass Filter
Adjust the Low Pass Filter frequency by turning the rotary encoder. You can switch the low pass filter off by
turning the rotary encoder up (clockwise) until the frequency passes 20kHz.
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).
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