▪ Light grey line: Subwoofer
▪ Brown line: System response
A peak in the response will occur if the filter frequency of the subwoofer is set too high – perhaps with large main
speakers that have an extended bass response. The result will be an excess of mid-bass energy that will sound
unnatural and bloated.
Subwoofer filter frequency set optimally
▪ L: Level
▪ F: Frequency
▪ Dark grey line: Main speakers
▪ Light grey line: Subwoofer
▪ Brown line: System response
The subwoofer and main speakers are well matched. The system frequency response is smooth without a peak
or dip. A well balanced sound will result.
Phase
With the phase settings you can adjust the phase relationship between the subwoofer and main speakers. If
either subwoofer or main speaker are slightly out of phase in relation to the other, it can result in decreased bass
output in the frequency response area where they overlap each other.
Parametric EQ (PEQ)
Provides three bands of low frequency parametric equalisation. Each band oers frequency, gain and Q
parameters. The equalisation is set “flat” by default.
Using Parametric Equalisation
The digital signal processing power incorporated in 18S enables three bands of parametric equalisation to be
applied to the input signal. Parametric equalisation can be viewed as finely targeted tone control that is able to
correct specific frequency response anomalies caused by room acoustics.
It should only be used after the subwoofer position has been finalised.
24 Professional Audio Subwoofers User manual
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