CARDIOID
CAPACITOR MICROPHONE
AT4033a
/
SM
40 SERIES PRECISION MICROPHONES
Description
The
AT
4033a/SM is a transformerless studio microphone
designed for use in the most demanding applications. Specifically,
the
AT
4033a/SM utilizes a gold-plated, “aged-diaphragm” capacitor
element with an internal baffle plate to increase the signal-to-noise
ratio of the microphone system. This, coupled with low-noise
transformerless electronics, makes this microphone ideal for the
most critical digital recordings. The dynamic range of the
AT
4033a/SM is 128 dB without the built-in attenuator, and it
accepts up to 145 dB SPL without capsule or electronic-system
distortion above 1% T.H.D.
The
AT
4033a/SM is the culmination of extensive field evalua-
tions in studio environments with resultant significant advances in
microphone performance factors. The
AT
4033a/SM’s low-noise cir-
cuitry is symmetrical and transformerless, resulting in exceptional
transient response and clean output signals, even under high-output
conditions. The microphone is totally free of the distortion associ-
ated with conventional transformer-coupled outputs. Its fast response
to transients contributes to the open, transparent reproduction of even
the most troublesome of instruments and sound effects. To ensure
optimum performance, a floating-construction element provides
isolation from noise and vibration.
The
AT
4033a/SM combines the benefits of exceptionally low self-
noise with very high output. Equally important, it handles very high
sound pressure levels with ease. The
AT
4033a/SM may be used with
confidence in a wide variety of miking applications even under the
stringent demands of modern digital recording systems. A switchable
10 dB (nominal) pad is built-in, increasing the SPL capabilities to 155
dB SPL.
An integral 80 Hz hi-pass filter provides easy switching from a
flat frequency response to a low-end roll-off. The hi-pass switch is
recessed to prevent accidental activation. The hi-pass position
reduces the microphone’s sensitivity to “popping” in close vocal use,
and handling noise. It reduces the pickup of low-frequency ambient
noise (i.e. traffic, air-handling systems, etc.) and room reverberation.
An internal open-cell foam windscreen is permanently installed
inside the case assembly between the grille and element for “pop”
protection.
The
AT
4033a/SM features undistorted reproduction of high sound
pressure level signals at all frequencies. The 2-micron-thick vapor-
deposited gold diaphragm provides accurate reproduction of even
the most subtle sounds, especially high-frequency signals not easily
reproduced by conventional large-diaphragm condenser transducers.
Architects and Engineers Specifications
The microphone shall be a cardioid capacitor with a frequency
response of 30 Hz to 20,000 Hz. It shall operate from an external
48V DC (
±
4V) phantom power source. The element shall be
internally shock mounted. The microphone shall have a protective
foam pop filter between the case assembly and the diaphragm.
Nominal open-circuit output voltage shall be 25.1 mV at 1 kHz ,
1 Pascal. The microphone shall have an output impedance of 100
ohms and output shall be transformerless balanced. The microphone
shall accept a 145 dB SPL at 1 kHz while producing no greater than
1% T.H.D.
The microphone shall have a length of 6.69" (170.0 mm), a
maximum body diameter of 2.10" (53.4 mm), and a weight of 13.4 oz
(380 grams). Finish shall be matte black.
The Audio -Technica
AT
4033a/SM is specified.
The diaphragm of every
AT
4033a/SM is aged through five
different steps to assure the optimum characteristics achieved will
remain constant over years of use.
The symmetrical housing assembly surrounding the microphone
capsule and its open acoustical environment allow the off-axis response
to be ideally suited for studio work
where natural reproduction of off-axis
sound is of paramount importance. The
resultant 90
°
off-axis curve is nearly a
perfect facsimile of the on-axis curve, but
attenuated by 6 dB.
The
AT
4033a/SM will operate
in conjunction with any remote
“phantom” or “simplex” power source
supplying 48 volts DC, such as the
AC- powered Audio-Technica
AT8801
single-channel and CP8506 four-chan-
nel phantom power supplies.
The AT
4033a/SM includes an
AT8441 shock mount. This effective
shock mount fits
5
/
8
"- 27 threaded
stands. A stand clamp without shock
mount, the AT8430, is available as an
optional accessory.
AT
4033a /SM with included
AT
8441shock moun t
