Subaudio Filter & Subaudio Frequency - QSC PL218A User Manual

FEATURES & SETUP-
SIDE PANEL SWITCHES:
SUBAUDIO FILTER and SUBAUDIO FREQUENCY
The side panel cover plate must be removed to access the side panel switches.
CH1 SUBAUDIO FILTER, CH2 SUBAUDIO FILTER-
These push-button switches are used
to turn on or off the SUBAUDIO FILTER for each channel. Press the switch in for ON ; the green
LED illuminates when the filter is ON. Push in and allow the switch to release for OFF ; the green
LED extinguishes when the filter is OFF.
The filter's roll-off frequency is determined by each channel's SUBAUDIO FREQUENCY switch.
When the filter is switched OFF, a 5 hertz roll-off frequency protects the load against DC or deep
subaudio output from the amplifier. Unless you already have filtering upstream of the amplifier,
use the SUBAUDIO FILTER to protect your speakers from cone over-excursion caused by
frequencies below the speaker's limits. The OFF position should be used only for subwoofer
systems with rated frequency response below 30 hertz or if low frequency filtering is provided by
other devices.
CH1 SUBAUDIO FREQUENCY, CH2 SUBAUDIO FREQUENCY-
These switches
determine the low frequency roll-off of the SUBAUDIO FILTER. Generally, match the frequency
selection to your speaker's low frequency capability. This improves speaker performance by
limiting subaudio cone movement, making more power available for the speaker's rated
Subaudio filter frequency response- filter off
frequency range. 30 Hz and 50 Hz are the available settings. If the SUBAUDIO FILTER switches
are OFF, these settings will have no effect. These switches are located on sections 1 and 10 of
the left-most DIP switch.
Subaudio filter frequency response- filter on, 50 hertz selected Subaudio filter frequency response- filter on, 30 hertz selected
10