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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.
Subwoofer too low, main speakers too high
A gap in the frequency response occurs, if the cut-off frequency
of the subwoofer is set too low and of the main speakers too high
(or if the main speakers are not able to reproduce low frequencies
accordingly). In this acoustic hole you will miss some signal
information and experience a thin bass sound.
Subwoofer too high, main speakers too low
In the other case you will experience unnatural and bloated bass
sound, if the overlapping area is too large. The combined frequency
response shows a bump, as the sound pressure levels in this area
are increased.
General tips
Combined frequency response
Subwoofer
Main speakers
Frequency/Hz
Level
Combined frequency response
Subwoofer
Main speakers
Frequency/Hz
Level
Combined frequency response
Subwoofer
Main speakers
Frequency/Hz
Level