5. Operation
10 Dynaudio Acoustics BM14S
Setting the phase (Phase)
With the phase settings you can adjust the phase relationship between the subwoofer
and main speakers. If subwoofer and main speaker are out of phase in relation to
each other, it can result in decreased bass output in the frequency response area
where they overlap each other.
The phase relationship between subwoofer and satellite speakers is very dependent
on relative distance, construction and working principles of the main speakers. The
figure on the left shows a case whereby phase of the subwoofer and main speakers
are incorrect in the critical overlap area, thus significantly reducing acoustic output in
the listening room in that area.
To find the correct phase setting:
1. Play a bass-rich track which also covers the overlap area.
2. Toggle the Phase switch between 0° and 180°.
Choose the setting for which you experience the most bass.
Setting the satellite cut-off frequency (Highpass)
Depending on the bass capabilities of the speakers, the frequency range of
subwoofer and speakers can overlap between 50 Hz and 150 Hz. A bump or a gap in
the frequency response and thus a lower sound quality will be experienced if the
system is not matched properly. In addition, small speakers and low powered
amplifiers will particularly be affected by the low frequency signals, which again has
a negative effect on the sound quality. Therefore it makes sense to limit the bass
range of the connected speakers (called “satellites” in this case) by a highpass filter.
The BM14S provides three settings to achieve this:
• Flat = no limitation
• 60 Hz = frequencies below 60 Hz are cut-off
• 80 Hz = frequencies below 80 Hz are cut-off
To set the cut-off frequency
X Switch Highpass control to needed position.
Note: You can not set the phase if the subwoofer is in slave mode. In this case the
phase is controlled by the setting of the master subwoofer.
Combined frequency response
Subwoofer
Main speakers
Level
Frequency
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