1. Introduction
This manual contains essential information for the
operation and care of the products you have pur-
chased. Please read the instructions carefully and
completely before using the equipment. Please
keep this manual where it will be accessible at all
times to all current and future users.
Additional information, in particular concerning
available accessories and Neumann service
partners, can always be found on our website:
www.neumann.com. Information about service
partners can also be obtained by telephone:
+49 (0) 0 / 4 1 77 4 - 0.
The following related files are available in PDF
format in the Downloads section of our website
www.neumann.com:
Operation with Unbalanced or Center Tap
Grounded Inputs
Some Remarks on Microphone Maintenance
The Neumann online forum on our website
enables Neumann users worldwide to share their
experiences. Through its integrated archive func-
tion, the forum has developed into an extensive
knowledge pool.
2. Safety instructions
The microphone and the accompanying power
supply equipment have the intended purpose
of converting acoustic signals into electrical
signals.
Connect the microphone only to power supply
equipment that has been approved by Neumann
for this purpose. Connect the output of the
power supply equipment only to devices which
have an input that is suitable for microphones.
Repairs and servicing are to be carried out only
by experienced, authorized service personnel.
Unauthorized opening or modification of the
equipment shall void the warranty.
High operating voltages are required for the
tube in the microphone. Contact with the volt-
ages present in the interior of the device can
result in injury or death; therefore, the micro-
phone and power supply must be opened only
by authorized, qualified personnel.
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The microphone must be operated only with
the supplied microphone cable or with a cable
of the same type. Since hazardous voltages are
generated by the power supply that can result
in injury or death, always ensure that the mi-
crophone cable used is undamaged. Damaged
cables must no longer be used, and must be dis-
abled in order to prevent injury to persons as a
result of accidental use.
Use the equipment only under the conditions
specified in the “Technical data” section. Allow
the equipment to adjust to the ambient tempera-
ture before switching it on.
Do not operate the equipment if it has been dam-
aged during transport.
Always run cables in such a way that there is no
risk of tripping over them.
Unless required for operation, ensure that liquids
and electrically conductive objects are kept at a
safe distance from the equipment and its connec-
tions.
Do not use solvents or aggressive cleansers for
cleaning purposes.
Dispose of the equipment in accordance with the
regulations applicable to the respective country.
3. Brief description
The M 147 Tube is a condenser studio microphone
with transformerless circuit technology and a
cardioid directional characteristic.
Key features include extremely low self-noise, an
extensive dynamic range and the full, rich, warm
sound of the tube.
Typical applications of this universally applicable
microphone include dubbing, broadcasting, and
vocal and instrumental recording.
4. Scope of delivery
M 147 Tube Single:
M 147 Tube microphone
SG 1 stand mount
Operating manual
Wooden box
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M 147 Tube:
M 147 Tube microphone
N 149 A power supply unit with power cable
SG 1 stand mount
KT 8 microphone cable
Operating manual
Dust cover
Aluminum case
5. Setup
Mounting the microphone
Attach the microphone to a stable, sturdy stand.
Use an elastic suspension, if necessary, for the
mechanical suppression of structure-borne noise.
For this purpose set the microphone into the inner
cage from above, and secure it to the inner cage
with the threaded nut. If required, use a wind-
screen or popscreen from our range of accesso-
ries in order to suppress wind or pop noise.
Connecting the microphone
Caution: An incorrect supply voltage can dam-
age the microphone!
Attach the microphone only to power supply
equipment which has been approved by Neumann
for this purpose.
Caution: Very loud noise can damage loud-
speakers or your hearing!
Minimize the volume of connected playback and
recording equipment before connecting the mi-
crophone and the power supply unit.
Ensure that the power supply unit is switched off.
Using the supplied 8-pin microphone cable, con-
nect the microphone to the microphone input of
the power supply unit.
Up to approximately 00 m, the total distance
from the microphone to the subsequent amplifier
input has no effect on the frequency response.
However, the length of cable between the micro-
phone and the power supply unit should not ex-
ceed 100 m. A sensor compensates for the drop in
the supply voltage.
Using a suitable cable, connect the output of
the power supply unit to the microphone input
of the audio equipment to be used for further
processing. Information concerning connector
assignment can be found in the “Technical data”
section.
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The power supply unit can also be connected
without difficulty to an input in subsequent equip-
ment that has 48 V of phantom power. However,
the phantom power is not required. In this case,
there will be a load current of approximately
1 mA.
Using the supplied connecting cable, connect the
power supply unit to the power supply line. Ensure
compliance with the instructions in the separate
operating manual for the power supply unit.
When connecting the cables, ensure that the con-
nectors are locked correctly. Run the cables in
such a way that there is no risk of tripping over
them.
Switch on the power supply unit. A sensor in the
power supply unit will ensure that the operating
voltages are not activated until the microphone
is connected and operational. The switch light of
the power supply unit, instead of glowing faintly,
will then begin to shine brightly.
After a few minutes, the tube in the microphone
will achieve a stable operating condition, and will
then exhibit extremely low self-noise.
Address the microphone from the side on which
the Neumann logo is located.
Gradually increase the volume of the connected
equipment.
Set the gain of the connected equipment so that
no distortion occurs at the highest sound pres-
sure level.
Suppressing noise interference
The frequency response of the M 147 Tube ex-
tends below 0 Hz. The microphone is of course
correspondingly sensitive to low-frequency inter-
ference such as structure-borne noise and wind or
pop noise. Depending upon the situation, the use
of an elastic suspension, a windscreen and/or a
popscreen is therefore recommended.
Sound test
Simply speak into the microphone. Do not blow
into the microphone or subject it to pop noise,
since this can easily result in hazardous sound
pressure levels.
EN
EN
