DESCRIPTION
The ES933ML is a wide-range
miniature condenser micro-
phone with a MicroLine®polar
pattern. It is designed for
quality sound reinforcement,
professional recording, televi-
sion and other demanding
sound pickup applications. The
ES933ML is furnished with a
vinyl-coated steel hanger that
allows it to be adjusted for
correct positioning. An included
foam windscreen effectively
reduces noise from wind or
ventilation air currents.
The ES933ML is equipped
with UniGuard®RFI-shielding
technology, which offers
outstanding rejection of radio
frequency interference (RFI).
The microphone is RoHS com-
pliant – free from all substances
specified in the EU directive on
hazardous substances.
The microphone's MicroLine®polar pattern provides a 90° angle of
acceptance. Additional interchangeable elements with omnidirec-
tional (360°), cardioid (120°) and hypercardioid (100°) pickup
patterns are available.
The microphone features a 50' (15.2 m) permanently attached
miniature cable. Its free end connects to the provided AT8538
power module via TA3F-type connector. It can be powered from
any external 11V to 52V DC phantom power supply. A recessed
switch in the power module permits choice of flat response or low-
frequency roll-off (via integral 80 Hz high-pass UniSteep®filter) to
help control undesired ambient noise.
The microphone is enclosed in a rugged housing with a low-
reflectance black finish. It is also available with white housing,
cable and hanger as the ES933WML. The AT8538 power module
is finished in black.
INSTALLATION AND OPERATION
The ES933ML requires 11V to 52V phantom power for operation.
The combination of small size and excellent response makes the
ES933ML ideal for suspension over choirs, instrumental groups or
theater stages. A uniform 90° angle of acceptance provides well-
balanced audio pickup over a narrow area. The microphone should
be located forward of the front-most source, above the rear-most
source, and “aimed” between them (Fig. 1). Increasing the height of
the mic above the sources will tend to equalize sound levels
between them, but may also increase pickup of background or
reverberant sound. Whenever possible, the distance from the mic
to the rear-most source should be no more than twice the distance
to the front source, to maintain front-to-rear balance (Fig. 1).
Width of pickup is approximately 1.5 times the distance to the
closest performer. If additional mics are needed for wide sources,
they should be positioned apart laterally at least 1.5 times the
distance to the front source, to avoid phase cancellation (Fig. 2).
To orient the microphone in the proper direction, twist the housing
slightly in its wire holder (clockwise rotation moves the microphone
to the right; counterclockwise rotation moves it to the left).
The provided foam windscreen simply slips over the element,
effectively reducing noise from wind or ventilation air currents.
Output is low impedance balanced. The output connector of the
power module mates with XLRF-type cable connectors. The
balanced signal appears across Pins 2 and 3, while the ground
(shield) connection is Pin 1. Output is phased so that positive
acoustic pressure produces positive voltage at Pin 2, in
accordance with industry convention.
ES933ML MICROLINE®CONDENSER
HANGING MICROPHONE
An integral 80 Hz high-pass UniSteep®filter provides easy
switching from a flat frequency response to a low-end roll-off. The
roll-off position reduces the pickup of low-frequency ambient noise
(such as traffic, air-handling systems, etc.), room reverberation
and mechanically coupled vibrations. To engage the UniSteep®
filter, use the end tip of a paperclip or other small pointed
instrument to slide the switch toward the “bent” line.
While a modern condenser microphone is not unduly sensitive
to the environment, temperature extremes can be harmful.
Avoid leaving the microphone in the open sun or in areas where
temperatures exceed 110° F (43° C) for long periods of time.
Extremely high humidity should also be avoided.
NOTE: Audio-Technica has developed a special RFI-shielding
mechanism that is an integral part of the connectors in the
Engineered Sound line. If you remove or incorrectly replace the
connector, you may adversely affect the unit's RFI immunity.
Audio-Technica offers a crimp tool (ATCT) and RFI shields for
TA3F-type, TA5F-type and XLRM-type connectors that enable you
to shorten the cable and correctly reinstall the connector while
maintaining the highest level of RFI immunity.
ARCHITECTS AND ENGINEERS SPECIFICATIONS
The microphone shall be a fixed-charge condenser designed for
suspended installation in permanent or portable applications.
It shall have a frequency response of 30 Hz to 20,000 Hz and a
MicroLine®polar pattern with uniform 90° angle of acceptance. It
shall be capable of accepting optional interchangeable elements
for additional polar patterns. It shall be capable of handling sound
input levels up to 133 dB with a dynamic range of 109 dB. Nominal
open-circuit output voltage shall be 17.7 mV at 1 kHz, 1 Pascal.
Output shall be low impedance balanced (250 ohms).
The microphone shall operate from an external 11V to 52V DC
phantom power source. It shall offer outstanding rejection of radio
frequency interference (RFI). The microphone shall be RoHS compliant.
The microphone shall have a permanently attached 50' (15.2 m)
miniature low-noise cable. Its free end shall connect to a provided
power module via TA3F-type connector. An optional crimping tool
and crimp sleeves shall allow for shortening of the cable without
loss of RFI immunity. The power module shall include a recessed
switch for low-frequency roll-off. The low-frequency roll-off shall be
a tailored roll-off at 80 Hz to minimize pickup of unwanted
mechanical noise. Output from the power module shall terminate
in a 3-pin XLRM-type output connector.
For suspended installations, the microphone shall be provided
with an adjustable steel wire hanger. The steel wire hanger shall
attach to the microphone body and allow for the positioning of
the microphone without the need for tools. Microphones using
goosenecks or other methods for positioning shall be unacceptable.
A foam windscreen shall be provided.
The microphone shall be 5.77" (146.5 mm) long with a head diameter
of 0.31" (8.0 mm). The microphone weight shall be 0.3 oz
(9.5 grams) without cable. The microphone case, cable and steel
hanger shall be finished in black [white]. The power module shall
be finished in black.
The Audio-Technica ES933ML [ES933WML] is specified.
LESS THAN 2 TIMES “X”
DISTANCE “X”
90°
ANGLE OF
ACCEPTANCE
Figure 1
MIC A
1.5 TIMES
DISTANCE “X”
MIC B
90°90°
Figure 2
