QSC CMX300V, User Manual, Page: 6 / 100

6
ENG
Input Filter
What it is
The low-frequency (LF) fi lter rolls off signals below either 30 Hz or 50 Hz (Figure 6 and 7) . This improves bass performance by limiting sub-audio
cone motion, making more power available for the speakers' rated frequency range.
The fi lter settings for each channel are controlled individually through the DIP switch settings shown in (Figure 4) . When the fi lter is turned off
(Figure 5) , a 5 Hz roll off protects against DC or deep sub-audio inputs.
When to use it (or not)
As a rule, your speakers will sound better with proper fi ltering. Unless you already have fi ltering in a preceding device, match the setting to the low
frequency rating of your speakers. Vented (bass refl ex, ported, etc.) speakers are especially sensitive to cone over-excursion at frequencies below their
rated limit.
The 50 Hz fi lter works well with most compact full-range speakers, and has a slight boost at 100 Hz for greater fullness. The 30 Hz fi lter is intended for
subwoofers and large full-range cabinets. The “off” position should be used only for applications such as studio playback monitoring, where you need
to know if there are unwanted sub-audio signals present in your mix.
– Figure 4 –
– Figure 5 –
– Figure 6 –
– Figure 7 –