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Product Information
USM 69 i
Stereo Microphone
www.neumann.com
Georg Neumann GmbH • Ollenhauerstr. 98 • 13403 Berlin • Germany • Tel.: +49 (30) 41 77 24-0 • Fax: +49 (30) 41 77 24-50
E-Mail: headoffice@neumann.com, engineering@neumann.com, catalog-info@neumann.com • Web: www.neumann.com
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he USM 69 i stereo microphone has two
separate dual-diaphragm capsules. These are
mounted vertically and rotate against each
other. The directional polar patterns can be
selected separately for each capsule. The capsules operate independently from each other.
Applications
The USM 69 i condenser stereo microphone
is a studio microphone for intensity stereo recording. It is suitable for XY and MS recordings.
Construction
The microphone consists of the amplifier section and the capsule head. The amplifier section contains two microphone amplifiers operating independently from each other. They
have an extremely low self noise.
Two completely separate microphone capsules
are positioned closely above each other within
the capsule head. Their diaphragms are made
out of gold-sputtered polyester film. The upper capsule rotates against the lower one over a
range of 270°. Color markings on the lower capsule system help to identify the angle by which
the upper capsule has been rotated.
When sound waves reach the microphone capsules from different directions they will generate audio signals with different intensity only,
but not with time differences, since the capsules are in close proximity and the sound arrives at both capsules simultaneously. The result is an intensity stereo signal that can be
summed together for excellent mono compatibility without causing interference.
Features
• Switchable stereo microphone
• Two pressure-gradient
transducers with double
membrane capsules
• MS- or XY-stereophony
• Capsules rotary by 270°
• Very low noise
• Aperture and pick-up angles
freely choosable
• Directional characteristics
reproducably switchable,
omni, wide angle cardioid,
cardioid, hypercardioid,
figure-8
Polar patterns
The USM 69 i has two built-in rotary switches. The five polar patterns of both capsules can
be selected at the microphone itself. Therefore, no special AC power supply units or powering adapters are necessary.
The two outputs attach directly to any 48 V
phantom powered connectors.
In addition to the usual polar patterns: omnidirectional, cardioid, and figure-8, we have added a hypercardioid and a wide-angle cardioid
pattern.
A built-in DC converter generates the required
capsule polarizing voltages.
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USM 69 i
Electrical features
The amplifiers feature high output capability and extremely low self noise. Distant sound sources, as well as very loud
sound sources at close range can therefore be recorded
without any problem.
Each amplifier has an active filter. It effectively suppresses subsonic interference as caused by wind or structure
borne noise. At the same time, the filter prevents the output transformers from overloading through very low frequency energy.
Use as a mono microphone
The microphones may also be used as completely independent mono microphones. There are many applications when
it is important to have a second mono microphone as a backup, or when the outputs of microphones with different polar
response characteristics must be available simultaneously.
The outputs of the two microphone channels can be linked
(cascaded). In addition to the individual directional patterns, other characteristics are available through the combination of both channels.
Operational safety
Application Hints
• As XY stereo mic
• As MS stereo mic
• Overall stereo main mic (overhead)
• Announcer’s mic for broadcasting, drama, features...
These are just some of the most common applications.
We recommend additional experimentation to gain
maximum use from this microphone.
Delivery Range
Microphone USM 69 i (mt)
Catalog No.
US M 6 9 i ............................................................. ni ........... 006974
USM 69 i mt ...................................................... blk ........ 006976
Selection of Accessories
Auditorium hanger, MNV 87 .................. ni........... 006804
Auditorium hanger, MNV 87 mt .......... blk ........ 006806
Elastic suspension, EA 30 A ................... ni ........... 006346
Elastic suspension, EA 30 A mt ........... blk ........ 006347
Windscreen, WS 69 ...................................... blk ........ 006750
Both microphone systems operate completely independent
from each other.
The second amplifier will be unaffected, even in case of a
faulty ground of the supply voltage for one of the channels, or a short circuit in one of the outputs.
The microphone is reliable in mono usage, even if only one
of the systems is operated and connected. Its simple and
redundant circuitry guarantees a low failure rate.
Should the DC converter ever fail, a diode circuit within
the microphone ensures that both systems will remain operational. The cardioid pattern is automatically chosen. The
sensitivity is reduced by 3 dB.
Battery supply, BS 48 i-2 ......................... blk ........ 006496
Power supply, N 248 EU ......................... blk ........ 008537
Power supply, N 248 US .......................... blk ........ 008538
Power supply, N 248 UK ......................... blk ........ 008539
Microphone cable, IC 5 ............................... blk ........ 006623
Microphone cable, IC 5 mt ....................... blk ........ 006624
Microphone cable, IC 6
(with stand mount swivel) ......................... ni ........... 006621
Adapter Cable, AC 20 (1m) ..................................... 006595
A complete survey and detailed descriptions of all
accessories are contained in the accessories catalog.
Meaning of color codes:
blk = black, ni = nickel
Technical Data
Acoustical operating principle ........................... Pressure gradient transducer
Directional pattern .................................. Omnidirectional, wide angle cardioid,
Frequency range ..................................................................................... 20 Hz...20 kHz
Sensitivity at 1 kHz into 1 kohm .............................................................. 13 mV/Pa
Rated impedance ................................................................................................ 150 ohms
Rated load impedance .................................................................................. 1000 ohms
Signal-to-noise ratio, CCIR1) (rel. 94 dB SPL) .............................................. 70 dB
Signal-to-noise ratio, A-weighted1) (rel. 94 dB SPL) ................................ 81 d B
Equivalent noise level, CCIR1)................................................................................. 24 dB
1)
according to IEC 60268-1; CCIR-weighting acccording to CCIR 468-3, quasi peak; A-weighting according to IEC 61672-1, RMS 2) measured as equivalent el. input signal
cardioid, hypercardioid, figure-8
Equivalent noise level, A-weighted1)............................................................. 13 dB-A
Maximum SPL for THD 0.5%2)....................................................................... 132 dB
Maximum output voltage ......................................................................................... 3 dBu
Dynamic range of the microphone amplifier (A-weighted) .......... 119 d B
Supply voltage (P48, IEC 61938) ......................................................... 48 V ± 4 V
Current consumption (P48, IEC 61938) .......................................... 2 x 0.7 m A
Matching connector ................................................................................................. XL R 5 F
Weight.................................................................................................................................. 510 g
Diameter ............................................................................................................ 30 + 48 m m
Length............................................................................................................................ 293 mm
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measured in free-field conditions (IEC 60268-4), tolerance ±2 dB
Errors excepted, subject to changes • Printed in Germany • Publ. 01/08 058158/A02
Neumann is a registered trademark of the Georg Neumann GmbH in certain countries.
®
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