Input sensitivity
Adjusts the input sensitivity to match the output level of your pre-amplifier or audio-visual processor.
Setting Input Sensitivity
The wide variety of possible source equipment types that can be connected to an active subwoofer means that it
is important to set the input sensitivity appropriately. Doing so will help ensure that the subwoofer’s volume
adjustment range is adequate and that its input and DSP electronics are driven properly.
If the source equipment has a published specification for output level, begin by setting the 18S input sensitivity to
match the specification as shown in this table:
Source Output Level 18S Setting
<1.0 V +6 dB
<2.0 V 0 dB
<4.0 V -6 dB
<10 V -14 dB
The -14 dB sensitivity setting should generally be used when the 18S is used for the LFE channel in a home
theatre system.
If the source equipment has no published output level specification, begin by setting the Input Sensitivity to -6 dB.
If then when in use the 18S volume setting is required to be towards either its maximum or minimum values,
adjust the Input Sensitivity appropriately such that the volume setting is towards the middle of its range.
Preset
The 18S incorporates low pass filter presets for a range of Dynaudio speaker models.
If your 18S is to be used in a system with one of the Dynaudio models listed, select it to automatically configure
the 18S low pass filter appropriately.
If your Dynaudio speaker model is not listed among the 18S presets, or if your 18S is to be used with speakers
from an alternative manufacturer, select a low pass filter frequency closest to the speaker’s specified -6 dB low
frequency cut-o.
If your subwoofer is to be used for the LFE channel in a home theatre system select the filter Bypass option.
Note
Matching the filter frequency of the subwoofer to the bass cut-o frequency of the main speakers will have an
important impact on the overall system sound quality. In general, larger main speakers will have more extended
bass so will require a lower subwoofer filter frequency. Conversely, smaller main speakers are likely to require a
higher subwoofer filter frequency. If the subwoofer filter frequency is not set optimally, the overall frequency
response of the system may display an audible peak or dip around the crossover frequency. The diagram
opposite illustrates the three frequency response characteristics that might result from optimum and non-
optimum subwoofer filter settings.
22 Professional Audio Subwoofers User manual
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