Owner`s manual

Operation
Owner’s manual 11
Selecting the subwoofer cut-off
frequency (SUB Lowpass)
Operation
Dynaudio Acoustics BM9S 9
Adjusting the volume (Gain)
The correct volume setting is an important aspect in achieving a well balanced
speaker combination.
X Adjust the Gain control, until correct setting is reached.
Selecting the subwoofer cut-off frequency
(SUB Lowpass)
The SUB Lowpass control allows the frequency range of the subwoofer to be
defined. Above the selected frequency the sound level decreases rapidly. The correct
setting of this cut-off frequency is important for a well balanced combination of
subwoofer and speakers.
Selecting the cut-off frequency
X Set the SUB Lowpass control to the desired frequency between 50 and 150 Hz.
Please also heed the instructions given in the operating manual of your loudspeakers.
CAUTION
HIGH SOUND LEVELS!
X To avoid auditory defects do not listen to high sound levels
over a longer period of time.
Note:
• You cannot adjust the volume, when subwoofer is in slave mode. In this case the
volume is controlled by the setting of the master subwoofer.
Note:
• The SUB Lowpass only works on SAT/SUB input.
• Perhaps subwoofer cut-off frequency is already set in the bass management of
your source. Please refer to the operating manual of your source. In general use
only one bass management system.
TheSUBLowpasscontrolallowsthefrequencyrangeofthe
subwoofer to be dened.Above the selected frequency the
soundleveldecreasesrapidly.Thecorrectsettingofthiscut-
offfrequencyisimportantforawellbalancedcombinationof
subwooferandspeakers.
Selectingthecut-offfrequency
Set the SUB Lowpass control to the desired frequency be-
tween50and150Hz.
Note:
 –TheSUBLowpassonlyworksonSAT/SUBinput.
 –Perhapssubwoofercut-offfrequencyisalreadysetinthe
bassmanagementofyoursource.Pleaserefertotheop-
erating manual of your source. In general use only one
bassmanagementsystem.
Please also heed the instructions given in the operating man-
ualofyourloudspeakers.
Setting the phase (Phase)
Operation
10 Dynaudio Acoustics BM9S
Setting the phase (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.
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.
Finding 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
(SAT 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 BM9S 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
Setting the cut-off frequency
X Switch SAT 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
Withthephasesettingsyoucanadjustthephaserelationship
betweenthesubwooferandmainspeakers.Ifeithersubwoof-
er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.
The phase relationship between subwoofer and satellite
speakersisverydependentonrelativedistance,construction
and working principles of the main speakers. The gure on
theleft showsa casewherebyphase ofthe subwooferand
main speakers are incorrect in the critical overlap area, thus
signicantlyreducingacousticoutputinthelisteningroomin
that area.
Finding 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.