Page 1
Product Information
USM 69 i
SM 69 fet
Stereo Microphones
Georg Neumann GmbH, Berlin • Ollenhauerstr. 98 • 13403 Berlin • Germany • Tel.: +49 (30) 417724-0 • Fax: +49 (30) 417724-50
E-Mail: sales@neumann.com, engineering@neumann.com, catalog-info@neumann.com • Website: www.neumann.com
Page 2
he SM 69 fet and USM 69 stereo microphones each have 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 SM 69 fet and USM 69 condenser stereo
microphones are studio microphones for intensity stereo recording. The microphones are
suitable for XY and MS recordings. The construction of the capsules is the same in both
microphones. Therefore, the acoustic features
of the transducers are identical. The only difference is the method of switching the polar
patterns and the way the microphones are connected to the system.
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 microphones
• 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
Page 3
USM 69 i
SM 69 fet
Stereo Microphones
Polar patterns SM 69 fet
In addition to the usual directional polar patterns: omnidirectional, cardioid, and figure-8,
we have added six intermediate positions.
The narrower characteristics
suppress sound from the side
more efficiently, while the
wide-angle polar patterns are
especially useful to record
large sound sources.
The directional patterns are
selected remotely from the power supply unit. Two rotary
switches are used to switch
between nine different polar
patterns for each system.
The rotary switches are marked in color and numbered
corresponding to the respective microphone
capsule.
The NS 69 i power supply unit is available for
AC mains supply.
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.
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.
Polar patterns USM 69 i
As a major difference, when compared with the
SM 69 fet, the USM 69 has two built-in rotary switches. The five polar patterns of both
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.
Technical Data SM 69 fet USM 69 i
Acoustical operating principle ............................................................................... Pressure gradient transducer ............................................................... Pressure gradient transducer
Directional pattern ........................................................................................... Omnidirectional, cardioid, figure-8 ............................................. Omnidirectional, wide angle cardioid,
Frequency range ........................................................................................................................................ 20 Hz...20 kHz ........................................................................................... 20 Hz...20 kHz
Sensitivity at 1 kHz into 1 kohm .................................................................................................................. 19 mV/Pa........................................................................................................ 13 mV/Pa
Rated impedance ................................................................................................................................................. 200 ohms ........................................................................................................ 150 ohms
Rated load impedance ................................................................................................................................... 1000 ohms .................................................................................................... 1000 ohms
Equivalent SPL CCIR 468-3 ..................................................................................................................................... 24 dB ................................................................................................................. 24 dB
Equivalent SPL DIN/IEC 651 ........................................................................................................................... 13 dB-A ............................................................................................................ 13 dB-A
S/N ratio CCIR 468-3 .................................................................................................................................................. 70 dB ................................................................................................................. 70 dB
S/N ratio DIN/IEC 651 .............................................................................................................................................. 81 dB ................................................................................................................. 81 dB
Maximum SPL for THD 0.5% .............................................................................................................................. 123 dB ..............................................................................................................132 dB
Maximum output voltage ..................................................................................................................................... 532 mV ......................................................................................................... 1100 mV
Dynamic range of the microphone amplifier DIN/IEC 651 .............................................................. 110 dB ..............................................................................................................119 dB
Supply voltage ...................................................................................................................................................... 48 V ± 4 V ...................................................................................................... 48 V ± 4 V
Current consumption ....................................................................................................................................... 2 x 0.6 mA ..................................................................................................... 2 x 0.7 mA
Matching connector .............................................................................................................................................. DIN 12 F.............................................................................................................. XLR 5F
Weight .................................................................................................................................................................................. 465 g ................................................................................................................. 510 g
Diameter ............................................................................................................................................................. 30 + 48 mm ................................................................................................ 30 + 48 mm
Length ............................................................................................................................................................................. 260 mm ........................................................................................................... 293 mm
with 6 intermediar y positions cardioid, hypercardioid, figure-8
Page 4
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.
Delivery Range SM 69 fet
Microphone SM 69 fet (mt)
Delivery Range USM 69 i
Microphone USM 69 i (mt)
Catalog No.
SM 69 fe t .......................................................... ni ......... 06410
SM 6 9 fe t mt................................................... blk ...... 06412
USM 69 i ............................................................. ni .......... 06974
USM 69 i mt...................................................... blk ....... 06976
Operational safety
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 con-verter 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.
Application Hints
• As XY stereo mic
• As MS stereo mic
• Overall stereo main mic (overhead)
• Announcer’s mic for
- broadcasting,
- drama,
- interviews,
- features
only for SM 69 fet:
• During recordings when the mic is in a location
where it is difficult to change polar patterns, for
example, suspended from a ceiling.
These are just some of the most common
applications. We recommend additional
experimentation to gain maximum use from this
microphone.
Selection of Accessories
Battery supply, BS 48 i-2 ....................... blk ......06496
Auditorium hanger, MNV 87 ................ ni ......... 06804
Auditorium hanger, MNV 87 mt ........ blk ...... 06806
Elastic suspension, EA 30 A ................. ni ......... 06346
Elastic suspension, EA 30 A mt ......... blk ......06347
Windscreen, WS 69 .................................... blk ......06750
only for SM 69 fet:
Power supply, NS 69 i (230 V) .......... gr ........06464
Power supply, NS 69 i (117 V) .......... gr ........06465
Microphone cable, SC 1 mt ................... blk ......06512
Microphone cable, SC 6
(with stand mount swivel) .......................... ni .......... 06507
Microphone cable, SC 6 mt
(with stand mount swivel) .......................... blk ....... 06508
only for USM 69 i:
Power supply, N 48 I-2 (230 V) ........ blk ......06500
Power supply, N 48 I-2 (117 V) ........ blk ......06502
Power supply, N 48 I-2
(without plug-in mains unit) ................... blk ...... 06504
Microphone cable, IC 5 ............................. blk ...... 06623
Microphone cable, IC 5 mt ..................... blk ...... 06624
Microphone cable, IC 6
(with stand mount swivel) ....................... ni ......... 06621
Microphone cable, IC 6 mt
(with stand mount swivel) ....................... blk ...... 06622
A complete survey and detailed descriptions
of all accessories are contained in the
accessories catalog.
Meaning of color codes:
blk = black
ni = nickel
gr = grey
Page 5
USM 69 i
SM 69 fet
Stereo Microphones
°
°
°
°
°
Page 6
Errors excepted, subject to changes • Printed in Germany • Publ. 11/00 58158/A03
Loading...