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7. About the M 720 FR Wireless loudspeakers
General
The M 720 FR Wireless loudspeakers are fitted with
the same drivers as the M 720 FR THX Select loud-
speakers, which makes them acoustically identi-
cal. This means you can freely assign the wireless
column speakers to either the front or rear sur-
round channels.
The wireless speakers are shipped with a trans-
mitter unit to connect them to the audio setup.
This transmitter converts the analog audio signal
into a digital signal and sends it to the M 720 FR
Wireless column speakers via a radio frequency.
The M 720 FR Wireless speakers receive the radio
signal from the transmitter unit and convert it
back into an analog signal. The audio signal is
then amplified internally and reproduced by the
loudspeakers.
Transmitter unit
The transmitter unit broadcasts its radio signals
at 48 kHz/16 bit on the 2.4 GHz ISM band at a data
rate of 1.5 Mbps. Within this frequency band, the
system has access to a total of 38 channels with a
bandwidth of 2 MHz each.
The source signal for transmission is taken from
the stereo cinch inputs on the transmitter unit.
A suitable signal for these inputs can be provided
from the preamp outputs of a multi-channel re-
ceiver/amplifier. Simply connect the receiver's Pre
Outs to the transmitter unit's cinch inputs using
the supplied stereo cinch cable. If your amplifier/
receiver does not feature any preamp outputs but
only high level speaker outputs, you can use the
signals from these after running them through
voltage converter adapters(Teufel product to be
purchased separately).
For the best possible signal transmission quality,
position the transmitter unit in a direct line of
sight with the M 720 FR Wireless speakers.
The signal can be transmitted using any one of
16 radio frequencies ("addresses"). Should the
default frequency already be in use by another
device, simply select any other of the 16 available
frequencies. Please note that you need to set up
the same radio frequency on the transmitter unit
and the M 720 FR Wireless in order for them to
connect.
Figure: Front panel of transmitter unit
Power LED
This LED indicates that the transmitter unit is
connected to the power supply.
Link LEDs
These two LEDs indicate whether a wireless con-
nection is established with the two wireless
speakers(permanently on). If either of the LEDs is
flashing, the connection is in the process of being
established. If either LED flashes continuously for
an extended period of time, this means that the
connection could not be established.
Mute
Press the "Mute" button to disable the audio out-
put from the M 720 FR Wireless speakers. Press
the button again to restore the previous volume
setting.
Volume
Press the "+" and "-" buttons to increase/de-
crease the volume level sent to the M 720 FR
Wireless speakers. By default, the volume level
is set to maximum, i.e., you can initially only de-
crease it. The volume setting is stored when the
unit is switched off, so it is the same when the
unit is switched back on.
Standby
Press this button to remotely switch the
M 720 FR Wireless speakers to standby mode.
This button also switches the transmitter unit to
standby mode. Press the button again to switch
the transmitter back to regular operation. This
also reactivates the wireless speakers.
Note: In order to facilitate the most power-saving
standby mode on the M 720 FR Wireless speakers,
the speaker receivers are also deactivated dur-
ing standby. To check whether there is any signal
coming from the transmitter unit, the speaker
receivers are briefly activated every 20 seconds.
After you switch the transmitter unit back to
regular operation, therefore, it may take up to
20 seconds for the M 720 FR Wireless speakers to
reactivate. Due to the battery drain of these reg-
ular receiver checks, we recommend running the
speakers in standby mode for no longer than 2–3
days. If you want to deactivate them for a longer
period, switch off the power button instead.
On/Off
Press this button to power down the transmitter
unit completely. The wireless speakers are also
powered down remotely. Note that in contrast to
standby mode, you cannot reactivate the spea-
kers remotely via the transmitter unit. Once the
speakers are powered down, you need to switch
them back on manually using the power switch on
the rear panel.
As the speakers' built-in receivers are not periodi-
cally activated to check for a transmission signal.
Teufel · LT 7
15
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