9
Subwoofer level
The level of the subwoofer relative to the loudspeakers can be
adjusted with the “SUBWOOFER LEVEL” rotary control. This
control allows matching the subwoofer level to the levels of the
other loudspeakers.
System level
All digital audio inputs and outputs are referenced to 0 dBFS (digital
Full Scale, the largest possible signal that can be represented by
an AES/EBU signal). Genelec SE7261A subwoofer produces a
sound pressure level of 100 dB (at one meter distance in free
space) for a digital input signal of –15 dBFS.
If the digital source can control the digital level, it may be
advantageous to lower the sensitivity either with the GLM.SE™
or the ”SYSTEM LEVEL” control of the subwoofer. This will enable
the use of the upper end of the digital level controller.
The “SYSTEM LEVEL” switch group allows scaling the
maximum sound level of the whole loudspeaker system. This
control changes the subwoofer level as well as the levels of all
loudspeakers connected to the subwoofer outputs.
It may be necessary to use the “SYSTEM LEVEL” attenuation
switches to ensure that high-level digital audio signals do not
overload the loudspeaker system. The suitable setting also
depends on the listening distance. The correct setting for this
control depends on the program source and the maximum sound
level needed.
Connector panel warning light
Normally the light on the connector panel of the subwoofer is
green, indicating that the subwoofer is in normal operational
mode.
The clip warning light (yellow) is activated by:
•
level limiter circuit (soft clip) being activated
The overload light (red) is activated by:
•
thermal overload of the power amplifier or loudspeaker
drivers (thermal protection has activated)
If a red warning light appears, turn the source level down. If the
levels are already modest, ensure that there are no bit errors in
the AES/EBU digital audio data.
Typical applications of different LFE
bandwidth settings
Using the 85 Hz LFE bandwidth setting with "Redirect" function
is the most universal configuration for LFE monitoring. However,
there are situations when the band-limited LFE settings serve a
definite purpose.
Limiting the LFE bandwidth to 85 Hz without using the
"Redirect" function can be used to simulate the effect of some
consumer decoders that do not replay information above 80
Hz on the LFE channel when the bass management is used.
Checking the multichannel mix with this setting on lets you know
how it translates in systems with this limitation.
The 120 Hz LFE bandwidth setting complies with the
replay systems of movie theaters and cinemas. 5 mm movie
soundtracks use the LFE channel to reproduce a bandwidth of
20 - 120 Hz through dedicated subwoofers. In this case the LFE
and main channel bandwidths overlap between 85 and 120 Hz,
which may create unwanted acoustical summing if the same
signal is present in both channels. To avoid this, the LFE content
should be kept completely different (de-correlated) from the low
frequency content of the main channels when mixing music and
sound effects for film release.
Maintenance
No user serviceable parts are to be found within the subwoofer
enclosure. Any maintenance or repair of the loudspeaker should
be undertaken by qualified service personnel only.
Safety considerations
Although the SE7261A has been designed in accordance with
international safety standards, to ensure safe operation and to
maintain the subwoofer under safe operating conditions, the
following warnings and cautions must be observed:
1. Servicing and adjustment may only be performed by
qualified service personnel. The subwoofer enclosure must
not be opened.
2. Do not use this product with an unearthed mains cable or
a mains connection without the protective earth contact as
this may lead to personal injury.
Summary of Contents for SE7261A
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