6
into the right end of the recess with the driver side facing the
room. This leaves sufficient 7,5 centimeters (") of free space on
the reflex port side. The height and depth of the recess should
not be any bigger than those needed to fit the subwoofer flush
with the wall surface.
SE7261A Subwoofer Features
Various controls and switches are accessible on the connector
panel. Let us define and explain here their use and function (from
left to right):
LFE Input 4 Controls
LFE in Use
When producing audio content in multichannel audio formats,
the use of the LFE channel is directly linked to the media release
format and the type of production. If in use, the LFE or (.1)
channel must be connected to AES/EBU INPUT 4 and the ‘LFE
IN USE’ switch must be set to YES position. If no LFE signal is
used, the ‘LFE IN USE’ switch should be set to NO position. The
LFE input (AES/EBU INPUT 4) then operates in the same way
as the other inputs.
AES/EBU Channel
An AES/EBU Single Wire signal normally carries two audio
channels in what are called subframes A and B. The “AES/EBU
CHANNEL” switch selects if the LFE signal is designated to
subframe A or B.
LFE Bandwidth
The LFE input can be set to two frequency ranges: 19 to 85 Hz
or 19 to 120 Hz using the “LFE BANDWIDTH” switch. Signal
content in the LFE signal above the frequency value selected
on the “LFE BANDWIDTH” switch is either not reproduced or is
redirected (see below). See also “Typical applications of different
LFE bandwidth settings” below.
Redirect
Using redirection allows the LFE channel to be monitored as a
full-bandwidth audio channel. If the LFE signal includes content
higher than 120 Hz, it can be monitored using the “Redirect”
function. This function allows rerouting of LFE signal above 85
Hz to the front center loudspeaker. This rerouted LFE content is
known as the redirected LFE signal.
Setting the “REDIRECT” switch to the “ON” position activates
the redirect function and it can only be activated if the “LFE
BANDWIDTH” switch is set to “85”.
The redirected LFE signal is added to the audio signal
contained in the other subframe of the AES/EBU audio cable
connected to INPUT 4. Typically the LFE channel is paired with
the Front Center channel, so one of the subframes of OUTPUT
4 carries the sum of the redirected LFE signal and the center
channel signal. OUTPUT 4 should then be connected to the
Front Center loudspeaker.
LFE +10 dB
In Dolby Digital and DTS encoding formats the LFE channel is
monitored with +10 dB gain relative to the main channels. The
object is to increase the headroom in the recorded signals.
Surround sound decoders may automatically add +10 dB of LFE
gain to restore the level balance.
Summary of Contents for SE7261A
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