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switch on each enclosure should be set to the
correct position (read chapter 'Position of
switches').
Position of switches
Before switching on the set the various controls
should be set to the correct position.
To discover the optimum setting of these controls
it is advisable to set the stereo balance, treble and
bass controls of the driver unit to the flat (central)
position. Where appropriate, other forms of tone
control
(e.g.
contour,
(scratch, rumble, etc.) should be switched off.
Input sensitivity control
The correct setting of this control is important, and
depends upon the output voltage produced by
your driver unit.
If used with a pre-amplifier, control
set to the position which corresponds to the rated
output of the pre-amplifier.
The output of power amplifiers, however, is
normally specified in watts/channel (the DIN HiFi
Standard specifies a distortion of less than 1 % for
a continuous sine wave output at 1000 Hz and into
a load of 4 or 8 Ohm). To relate this output (in
watts) to the input sensitivity (in volts) use the
conversion table given on page 29.
Take care to use the correct column, according to
whether power rating is specified for 4 or 8 ohms.
The calibration up to '3 V' is for pre-amplifiers, that
above '3 V' for low, medium or high power
amplifiers.
Channel selector switch
This switch on the left channel enclosure(s)
should be set to position 'left' and that on the right
channel enclosure(s) to position 'right'.
„
Adjustment controls
Since these controls are meant for factory
adjustment only, you are advised to leave these
controls untouched.
‚
Power on / off switch
After having set the other controls as already
mentioned, set volume control of your driver unit to
minimum.
Switch on the MFB enclosures by setting power
‚
switch
to the 'on' position (depressed). The
green stand-by indicator
switching on the driver unit an automatic on/off
switch will switch on the MFB enclosure within one
second after an audio signal from the driver unit
4
presence)
and
filters
...
...
should be
†
d
will light up. After
reaches the enclosure. In addition to the green
d
stand-by indicator
s
indicator
will now light up.
Adjust sound level with the volume control of your
driver unit.
lf no audio signal is received for a period of ap-
proximately three minutes, the enclosure will
automatically switch off and indicator
In this situation the stand-by circuit is still energized
and the stand-by indicator
The power consumption is in this condition
negligible.
lf desired the set can, of course, be switched off
fully by setting power switch
Electronic protection
To
safeguard
the
amplifiers,
in
the
overheating, the enclosure incorporates electronic
protection
circuits,
automatically.
Operation
• Bass, treble, volume and balance can be
adjusted on the driver unit.
• Even when the driver unit is switched off, MFB
enclosures used in combination with conventional
loudspeaker enclosures, e.g. for ambiophonic
reproduction, may inadvertently be switched on by
a pulse from the loudspeakers of the conventional
systems which effectively act as a microphone. In
this case the MFB enclosures should be switched
off completely by setting power switch
position.
• You are advised to switch off the enclosures
completely with power switch
prolonged
absence,
journeys, etc.
• The MFB loudspeaker enclosure differs fun-
damentally from the conventional type by virtue of
its integrated electronic circuitry. lt should not
therefore be exposed to excessive humidity.
Technical data
(subject to modification)
• Type of enclosure: Motional Feed Back with 2
amplifiers
• Total power of amplifiers: 35 W cont. sine wave
• Loudspeakers:
AD 70651/MFB4, 7" woofer
AD 01635/T15 dome tweeter
• Cross-over frequency: 1500Hz
• Connection sockets: phono sockets for signal
the red 'OPERATING'
s
goes out.
d
keeps on burning.
‚
to position 'off'.
MFB
loudspeakers
event
of
overloading
which
function
‚
to 'off'
‚
in case of
such
as
holidays,
and
or
fully
long
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