Switching on and setting
6
Dynaudio Focus 110 A
Connecting the AC power input
NOTICE:
Make sure mains voltage matches your region’s mains
voltage specification (see “Technical Specifications” on
page 10).
1.
Make sure the speakers are switched off.
2.
Connect the
AC power input
to the mains socket via the power
cable delivered with your speaker.
Switching on and setting
NOTICE:
Make sure all connections are made properly and the output
of the preamplifier is set to a low level.
X
Switch the Focus 110 A speakers on.
The Power LED
(2)
on the backplate will light green.
Protection circuits
The Focus 110 A speaker has several built in protection circuits to
reduce the risk of hazard or damage due to overloading.
The internal power amplifiers have thermal protection. This activates if
a problem should occur, and helps protect both the electronics and the
loudspeaker drivers.
There is also a thermal sensor measuring the temperature on the heat
sink
(5)
. An electronic circuit will mute the signal when too high
temperature is reached.
There is an overload protection circuit on the tweeter to prevent burning
the tweeter driver in case of overloading. This circuit will mute the
tweeter signal if too much current is fed to the tweeter.
The woofer channel has a built in limiter that protects the woofer unit
from too much excursion. It works by reducing the gain of the circuit
when a certain threshold level is reached.
NOTICE:
Avoid running the system into severe clipping. Despite the
advanced protection system, you may still be able to
damage your speakers by severe overpowering. The limiter
works over a certain range, but exceeding this level may
send a severely clipped signal to your drivers. When a
noticeable distortion occurs, please turn down the level to
your speakers.
Cutting off low frequencies
Without any filter setting, a speaker is forced to handle the full audible
range including very low frequency signals. The Focus 110 A is
designed for reproducing low frequencies down to 55 Hz very precisely
and at high sound pressure levels.
When operating the Focus 110 A together with a subwoofer (e.g. in a
home cinema setup) or to allow a higher undistorted sound pressure
level, it is recommended to cut-off low frequencies.
Lower frequencies can be cut-off by setting the
High pass
switch
(1)
.
Table 1: Settings for the High pass switch.
Set High
pass to...
to...
Flat
achieve full range reproduction
(no cut-off).
60 Hz
cut off frequencies below 60 Hz.
80 Hz
cut off frequencies below 80 Hz.
Setting
-10
0
+4
80 Hz
60 Hz
Flat
Level
High pass
Focus110A.book Seite 6 Mittwoch, 28. Januar 2009 6:44 18
