ARENDAL 1723, Handbook, Page: 41 / 57

5. Subsonic Filter
- Selectable subsonic fi lter settings, that will fi lter away the deepest frequencies. Selectable from 12 Hz to 31 Hz. In off mode
the amplifi er has an internal subsonic fi lter at 10 Hz to prevent instabilities in the power supply. Adding the subsonic fi lter will
ensure the subwoofer has less excursion in the deepest bass, and typically when fi ltering away some of the deepest bass it will
sound even “tighter”.
6. Subsonic Filter Slope
- The Subsonic fi lter slope mean at which rate the frequencies should be tapering off, from the frequency point chosen. It is
adjustable 6dB/Oct or 12dB/Oct. So, if you already set the subsonic fi lter frequency to 20Hz, then setting the slope to 12dB/Oct
will ensure that the signal has 12dB lower output at one octave under 20Hz (one octave above 20Hz is 10Hz).
SUBSONIC FILTER SET TO 20Hz
dB SP
L (REL 100Hz)
6dB/oct.
12dB/oct.
ARENDAL SOUND
SUBSONIC FILTER
10Hz
85 dB
80
70
65
60
55
50
100 200 300
75,1
20 30 40 50 60 70 80 90 400Hz
In this example you can see how the frequencies below 20Hz are affected by adjusting from 6dB/oct.
slope to 12dB/oct.