Wunder Audio CM50 User Manual

1. CM50

The Wunder Audio CM50 Tube Microphone comes with the original
spherical capsule. "Simply one of the most wonderful sounding
room mics in the world." The CM50 represents the pinnacle in a
revered line of microphones that stretches back to the very earliest
days of the Pro Audio. The inspiration is classic, the execution is
cutting-edge. We have successfully recreated the small pressure
transducer (similar to the capsule for the KM series microphones)
embedded in the surface of a 40 mm diameter perspex sphere.

It should be stressed that vacuum tubes, with their heater filaments,
are much more delicate than solid-state components. Consequently,
the user should take great care in handling the microphone. A drop
from even a moderate height may cause the filament to break and
may result in immediate failure of the microphone. It would be
advisable for the user to keep a spare tube – specially selected by
the Wunder Audio Service Department – always ready for
replacement.

It is important to note that the tube may have become slightly
unplugged from the tube socket during shipping. If the microphone
has no audio output, 99% of the time it is a result of a slightly
unplugged tube.

Repairs are to be carried out only by experienced, authorized
service personnel. Unauthorized opening of, or modification to
the equipment shall void the warranty.

The microphone tube requires a high operational voltage.
Contact with the voltages present in the interior of the
microphone and PSU may result in injury or death; therefore,
the microphone and PSU must be opened only by an
authorized, qualified technician.

The microphone must be operated only with the supplied
cable. Because hazardous voltages are generated by the PSU
that may result in injury or death, always ensure that the
microphone cable is undamaged. Damaged cables must no

longer be used.
The microphone must be operated only with the supplied
cable. Since hazardous voltages are generated by the PSU that
can result in injury or death, always ensure that the
microphone cable used is undamaged. Damaged cables must
no longer be used.

Operation

The CM50 is equipped with a 8-pin Tuchel connector that plugs into
the base of the microphone and screws tight. Always make sure that
the PSU is switched off when plugging the microphone connector
into the microphone and PSU.

Polar pickup pattern

The capsule of the CM50 is equipped with a small diaphragm and
mounted inside a perspex sphere. It operates as an omni-directional
pressure transducer. The frequency response of the microphone
rises at the high frequency end evenly by about 5 dB without
becoming too directional. With a diffuse sound field, this results in
an almost linear frequency response from 40 Hz to 15 Khz.

How to mount the microphone

A special Yoke mount/stand adapter is provided and should always
be used to mount the microphone on floor stands or booms.

To mount the microphone, fully unscrew the knurled knob on the
side of the metal belt. Place the microphone into the metal belt
making sure that the white jewel on the front of the microphone is
centered into the center hole on the yoke belt. Make sure that the
there is no black rubber grommet in the center hole on the belt, if it
is present, remove it.

Close the metal belt carefully around the microphone making sure
that the leading edge of the metal belt does not scratch the body of
the microphone. Screw the knurled knob clockwise to tighten the