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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 cap-
sules operate independently from each other.
Applications
The USM69 i condenser stereo microphone
is a studio microphone for intensity stereo re-
cording. It is suitable for XY and MS recordings.
Construction
The microphone consists of the amplifier sec-
tion and the capsule head. The amplifier sec-
tion contains two microphone amplifiers oper-
ating 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 up-
per capsule rotates against the lower one over a
range of 270°. Color markings on the lower cap-
sule system help to identify the angle by which
the upper capsule has been rotated.
When sound waves reach the microphone cap-
sules from different directions they will gener-
ate audio signals with different intensity only,
but not with time differences, since the cap-
sules are in close proximity and the sound ar-
rives at both capsules simultaneously. The re-
sult is an intensity stereo signal that can be
summed together for excellent mono compat-
ibility without causing interference.
Polar patterns
The USM69 i has two built-in rotary switch-
es. The five polar patterns of both capsules can
be selected at the microphone itself. There-
fore, no special AC power supply units or pow-
ering adapters are necessary.
The two outputs attach directly to any 48V
phantom powered connectors.
In addition to the usual polar patterns: omni-
directional, cardioid, and figure-8, we have add-
ed a hypercardioid and a wide-angle cardioid
pattern.
A built-in DC converter generates the required
capsule polarizing voltages.
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