Teufel LT 7 Series Technical Specifications And Operating Manual page 17

7. About the M 720 FR Wireless loudspeakers
The front panel of the M 720 FR Wireless contains
the following controls:


Figure: M 720 FR Wireless (detail view of front
panel, speaker cover removed)
 Status LEDs
These three LEDs indicate the different operating
modes of the M 720 FR Wireless. This is what the
different colours mean for each LED:
Top LED
4
– Red, permanent = Mute(no connection
to the transmitter)
– Red, flashing = Mute button on the
transmitter is engaged
– Green, permanent = Link(Connection with
transmitter has been established)
– Green, flashing = Searching for transmitter
Middle LED
4
– Red = Battery is recharging
Bottom LED
4
– Red = Battery nearly empty
– Orange = Battery partially charged
– Green = Battery fully charged
 Frequency
With this recessed control, you can set the radio
frequency for the M 720 FR Wireless. We recom-
mend using a small screwdriver for accessing
this control. 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.
Range
The range of the wireless connection is 150–
200 m without obstructions. Inside buildings, the
effective range is usually at approx. 30 m. This fig-
ure may be significantly larger or smaller depend-
ing on the building materials. We recommend
experimenting with different placement options.
If possible, position the speakers in a direct line
of sight with the transmitter unit.
Battery operation
If the batteries are fully charged and the M 720
FR Wireless speakers are being used as home the-
atre rear speakers, they should run for at least
8–10 hours, even at a moderately high system
volume. Note, however, that the exact duration of
the battery charge depends on several factors:
1. Volume level
2. Type of signal(i.e., how often, how long)
3. Speaker designation (front speakers, for
example, reproduce significantly higher signal
levels than rear speakers)
The actual battery charge duration, therefore,
may well be either longer or shorter than the av-
erage charge duration.
When fully drained, the batteries take approx.
4–5 hours to recharge. For the highest possible
charge duration, we recommend recharging the
batteries for as long as possible, e.g., overnight.
The lead gel batteries cannot be overcharged.
Also, the batteries are not affected by voltage
depression ("memory effect"), i.e., you can re-
charge them at any time regardless of the exist-
ing charge level.
Note:
You can run the
M 720 FR Wireless speakers
even while they are recharging.
Similarly, you can also run them
off the mains power
permanently.
Be aware, however, that the
amplifiers integrated into each
M 720 FR Wireless also use the
batteries as buffers for peak
signal loads. If the batteries are
completely drained,
we recommend charging them
for half an hour before running
the system off the mains power
in order to ensure sufficient
buffering.
Teufel · LT 7
17