Best of the year 2012-2013 - page 4

precise, which is the result of a fast
change in the air pressure. As this oc-
curs even before a frequency is gener-
ated, it is a pure acceleration process.
This is registered by the human ear no
later than after a few mikroseconds, and
the signal is processed by the brainstem
to a piece of directional information. In
other words, we immediately localize
the direction that the sound originates
from. The other areas of the brain only
become active after this has happened.
For example, the diencephalon deter-
mines the magnitude and distance of
the sound source with astonishing ac-
curacy. Actual noise recognition and
sound evaluation only happen at the end
of this process, consecutively in the sub-
ordinate brain areas and in the cerebral
cortex. This made Manger realise that it
had to be possible to build a loudspeak-
er that, in contrast to conventional cone
and dome drive units, did not generate
its own transient superim-
posed on the reproduced
signal. Because the con-
stant transients unavoid-
ably generated by the
piston-like movements of
the drive unit trigger the
listener’s age-old local-
ization reflex described
above. This means that
the listener initially uses
this elemental reflex to
recognise or localize the
loudspeaker and this has
two consequences. First-
ly, the human ear can be-
come tired more or less
quickly as the localization
reflex is constantly trig-
gered again and again.
Secondly, the listener is
forced to sit in the famous
“sweet spot “ with stereo reproduction,
as this is the only position where the
sound travel times from the right and
the left loudspeakers are approximately
equal, enabling the listener to compen-
sate the localization of the loudspeakers
and concentrate on the essential, i.e. on
the music being played.
The Manger sound transducer, or MSW
for short, is based on Manger’s inten-
sive study of the physiology of hearing.
These bending wave transducers that
incidentally have nothing at all to do with
so-called bending resonators or omni-
directional radiators, for example from
Meletzky in Berlin, has no mass-and-
spring effect with its undesirable ener-
gy-storing forces unlike conventional
drivers. The MSW has a flexible plate-
like membrane that behaves like a me-
chanical resistor. The sound is broken up
by the different propagation speed in this
three-layer sandwich-type membrane
into separate frequency ranges. Here
the signal spreads across the membrane
surface, which has a different stiffness
at the centre than at the outer rim, from
the inside to the outside in the form of
a travelling wave. Higher frequencies
are emitted in the centre and the ever
lower frequencies radiated to the rim. In
this way sound radiation of the complex
signal comprising many different indi-
vidual frequencies is simultaneous and
the phase patterns of the original are re-
tained. This is the point where the more
attentive reader sits up and takes notice.
Yes, AKG developed a similar technology
with its headphone membranes designed
using the patented Varimotion process.
(For more details see the test report on
the AKG K 702 in Issue 2/2009). In Man-
ger’s case however it was actually the
human ear, to be more precise the basi-
lar membrane in the cochlea, that served
as the model. Here the complex sound
signal is also emitted in the form of a
travelling wave. The striking star shape
of the MSW is certainly not a design gag
to humour people who enjoy the trap-
pings of Christmas at their workplace.
This unique shape also serves to damp
long waves, i.e. the low frequencies, ab-
sorb these and ensure that no reflections
can return from the rim to falsify repro-
duction quality. And this is why Manger
refers to this jagged component of the
transducer as a star-shaped damper.
Completely manufactured
in Germany
Thanks to its design principle and the
way the 190 millimetre plate-type mem-
brane operates, the MSW is capable of
handling a frequency range from 80Hz to
an astonishing 35 kHz while simultane-
ously approximating the ideal of a point
sound source. In spite of this unusually
large operating range and a high effi-
ciency factor of 91dB 1 W/1 m, the MSW
achieves a remarkably fast rise time of
under 13 microseconds. Thirty years ago
Manger designed a special voice coil
to achieve this, which actually involved
two mechanical moving coils switched
in parallel, made from aluminium wire
on an aluminium base and with pure
copper wire leads. The overall result is
a long, but nevertheless very light voice
coil, weighing no more than 0.4 grams in
The MSMc1 is an ampli-
fied two-way loudspeaker.
In addition to the obvious
Manger trademark, the
MSW sound transducer,
easily recognisable by its
star-shaped damper, the
speaker also has a new
woofer-midrange unit that
is responsible for all fre-
quencies below 250 Hz
Test
Nearfield-Monitor
Manger MSMc1
74
Professional audio Magazin 3/2009
Translated to english and copyright by: Manger Products, Industriestrasse 17, D-97638 Mellrichstadt, Tel. +49 9776 9816, Fax +49 9776 5925, eMail:
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