Technical information

Owners Manual 25
Cut-off frequencies
Note: When using multiple subwoofers, ensure that all settings such as level, cut-off
frequency, phase and LF extension are identical. Use the LFE and Slave mode
options to ensure that all subwoofers operate on the same settings (refer to
chapter “Multiple subwoofer connections” on page 13).
Cut-off frequencies
Matching the frequency responses of subwoofer and speakers has an important impact
on the overall sound quality, when integrating a subwoofer into a audio-video-system. In
general a large, floor-standing speaker still has significant output in the deeper bass
range, whereas a very small speaker will not be able to reproduce deep bass at all. In the
first case a bump in the overlapping area will cause a louder or even bloated sound while
in the second case an acoustic hole will be experienced.
The following figures visualize the possible results (please note that all curves are for
illustration purposes and do not show exact filter characteristics).
Cross-over frequencies set correctly
Subwoofer and main speakers are perfectly matched, when the combined frequency
response is smooth without bumps and gaps. A neutral sound will be the result.
Level
Frequency/Hz
60 Hz
80 Hz
100 Hz
Flat
50 Hz
100 Hz
150 Hz
50 100 150
Level
Combined frequency response
Subwoofer
Main speakers
Frequency