M 420 F Controls - Teufel Theater 4 Hybrid Series Technical Specifications And Operating Manual

What the icons mean
The lightning/arrow symbol
inside an equilateral triangle
informs the user
about the possibility
of a dangerous, non-isolated
electrical current
inside the device housing,
indicating the risk of
electrical shock.
The exclamation mark within
the equilateral triangle,
which can be seen on the
back of the unit, indicates
that there is important
operating
and service information
for the user to read.
This product complies with the
following European Union
guidelines:
89/336E WG and 73/23 EWG.
The "wastebin" symbol printed
on the type plates and amplifier
labels of our products signifies
that Lautsprecher Teufel ensures
the proper disposal of its sold
loudspeakers and subwoofers ac-
cording to Germany's Electrical
and Electronic Equipment Act.
14 Teufel · Theater 4 Hybrid

M 420 F Controls

M 420 F rear panel
Q W
R
T
Y
U
Q Auto – On
With this switch, you can select whether the sub-
woofer is on permanently ("On") or only when a
signal is detected ("Auto"). In "Auto" mode, the
LED (4) is initially on green, and the subwoofer is
running. After a period of inactivity for 10–15 min-
utes, the subwoofer reverts to standby mode, and
the LED is red. As soon as the subwoofer detects
E
a signal from the amplifier/receiver, it resumes
operation, and the LED is green again.
W Stereo Amp – AV Receiver
With this switch, you can configure the loudspea-
ker's internal circuits according to input source
– "Stereo Amp" for a conventional stereo signal,
or "AV Receiver" for a multi-channel surround sig-
nal with filtering and polarity predetermined by
the receiver.
E Bass Level -3dB/0 dB/+3 dB
This switch controls the balance between the ac-
tive bass signal and the passive midrange/tweet-
er signal. The bass level can be increased by +3 dB
or reduced by -3 dB. If you do not want to change
the balance, leave the switch at "0 dB" . This switch
I
is useful to adapt the speaker's frequency bal-
ance if you are feeding it a conventional stereo
signal. Multi-channel amplifiers usually have their
own controls for adapting the subwoofer level, so
in this case you should be able to leave the switch
at "0 dB" .
R Power
This LED indicates the operational status:
LED on = unit on. LED off = unit off.
T Line In
Connect the AV receiver's "Sub Out" to the sub-
woofer's "Line input" using a Y adapter and a
mono cinch cable.
Y High Level In
These inputs are connected to the M 420 F's pas-
sive midrange/tweeter unit. Plug in the speaker
cables coming from the AV receiver's Front
Speaker outputs(L/R) here.
U Power
Switch to "On" to power up the subwoofer; switch
to "Off " to power it down.
I Fuse
This is where the mains power fuse is located.