Audio-Technica AT933RX-ML User Manual
AT933Rx/ML
MicroLine
Description
The AT933Rx/ML is a wide-range miniature
condenser microphone with a MicroLine polar
pattern. It is designed for quality sound reinforcement, professional recording, television, and
other demanding sound pickup applications. The
AT933Rx/ML is furnished with a vinyl-coated steel
hanger adapter that allows it to be adjusted for
correct positioning.
The microphone features a 50' (15.2 m)
permanently-attached miniature cable. Its free
end connects to the provided AT8533x power
module via internal solderless screw terminals
for simple cable-length adjustment in the field.
It can be powered from any external 9V to 52V DC
phantom power supply. A recessed switch in the
power module permits choice of flat response or
low-frequency roll-off to help control undesired
ambient noise.
Four additional interchangeable elements
are available to permit selection of angle of
acceptance from 90° to 360°.
The microphone is enclosed in a rugged
housing with a low-reflectance black finish. It is
also available in white as the AT933RWx/ML.
Installation and Operation
The combination of small size and excellent
response makes the AT933Rx/ ML ideal for
suspension over choirs, instrumental groups or
theater stages. A uniform 90° angle of acceptance
provides well-balanced 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 betw een them, but
may also increase background/reverberant sound
pickup. Whenever possible, the distance from the
mic to the rear-most pickup 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
not be closer together laterally than 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). Adjust the vertical angle by changing
the number of loops the cable passes through in
the steel hanger.
The provided foam windscreen simply slips
over the MicroLine 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.
To shorten the cable, remove the three
screws from the base of the power module and
slide the outer case up the cable to reveal the circuit board and screw terminals. Loosen the three
terminal screws and remove the cable from the
module. Next, slide the case off the cable, cut the
cable to the desired length (allowing a few extra
inches) and slide the case back onto the cable.
Tie a single knot in the cable about two inches
from the cut end. Following Figure 3, cut the
cable off 1" down from the top of the knot and
carefully remove 1/2" of the outer jacket. Strip
the mic cable wires and attach them to their
respective terminals (Fig. 4). Make certain
that the terminals are clamped on the
conductors, not on the insulation,
and that there are no loose
strands of wire which might
touch other terminals.
Replace the case, being
certain that it goes
over
the case grounding
contact and that the
roll-off switch is
accessible. Finish by
replacing the three base
screws and testing for proper operation.
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.
Frequency Response (Typical)
10 dB
50
LEGEND
500
200100
Frequency in Hertz
12" or more on axis (flat)
Roll-off
2k
1k
10k
5k
20k
Miniature
Condenser
Hanging
Microphone
Response in dB
90°
ANGLE OF
ACCEPTANCE
LESS THAN 2 TIMES “X”
DISTANCE “X”
Figure 1
MIC A
1.5 TIMES
DISTANCE “X”
Figure 2
MIC B
Terminal
screws
Case
grounding
contact
Shield
1"
1
Shield strands,
fully twisted
/2"
90°90°
Yellow-Yellow
Red-Red
1
/8" strip reds
and yellows
Figure 3
SYR
PC board
switch side
Figure 4
Yellow-Yellow
Red-Red
AT933Rx /ML
AT933Rx/ML Specifications
Element Fixed-charge back plate
Polar Pattern MicroLine
†
permanently polarized condenser
Frequency Response 30- 20,000 Hz
Low-frequency Roll-off 150 Hz, 6 dB/octave
Open Circuit Sensitivity –36 dB (15.8 mV) re 1V at 1 Pa*
Impedance 200 ohms (1000 ohms without power module)
Maximum Input Sound Level 131 dB SPL, 1 kHz at 1% T.H.D.
Dynamic Range (Typical) 105 dB, 1 kHz at Max SPL
Signal-to-noise Ratio
1
68 dB, 1 kHz at 1 Pa*
Switch Flat response, low-roll-off (recessed)
Phantom Power Requirements 9-52V DC, 2 mA typical
Weight
Microphone 0.7 oz (20 grams)
Power Module 2.1 oz (60 grams)
Dimensions
Microphone 5.61" (142.4 mm) long, 0.31" (8.0 mm) head diameter
Power Module 3.58" (91.0 mm) long, 0.83" (21.0 mm) diameter
Output Connector (Power Module) Integral 3-pin XLRM-type
Cable 50' (15.2 m) long (permanently attached to microphone),
Accessories Furnished (AT933Rx/ML) AT8138 MicroLine foam windscreen;
(AT933RWx/ML) AT8138WH MicroLine foam windscreen;
0.13" (3.2 mm) diameter, 2-conductor, shielded cable;
free end attaches to screw terminals in power module
AT8452 MicroLine hanger
AT8452WH MicroLine hanger
(Both) AT8533x power module
Optional Interchangeable AT853C-ELE cardioid (120°)
Elements
2
AT853H-ELE hypercardioid (100°)
AT853O-ELE omnidirectional (360°)
AT853SC-ELE subcardioid (170°)
†In the interest of standards development, A.T.U.S. offers full details
on its test methods to other industry professionals on request.
* 1 Pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL
1
Typical, A-weighted, using Audio Precision System One.
2
These elements require a P12024 element adapter.
Dimensions
0.31"
8.0 mm
5.61"
142.4 mm
50
15.2 m
0.13"
3.2 mm
3.58"
91.0 mm
21.0 mm
0.83"
Polar Pattern
0
30
60
90
120
150
270
LEGEND
200 Hz
300
240
1 kHz
5 kHz
8 kHz
330
210
180
SCALE IS 5 DECIBELS PER DIVISION
Architects and Engineers Specifications
The microphone shall be a fixed-charge
condenser with a MicroLine polar pattern and
a frequency response of 30 Hz to 20,000 Hz. It
shall be capable of accepting optional interchangeable elements for additional polar patterns. It shall
operate from an external 9V to 52V DC phantom
power source. Nominal open-circuit output voltage
with the included power module shall be 15.8 mV
at 1 kHz, 1 Pascal. Output shall be low impedance
balanced (200 ohms).
The microphone shall have a permanentlyattached 50' (15.2 m) miniature cable with a pigtail
output. The pigtail output shall connect to a power
module via internal solderless screw terminals. The
power module shall include a switch f or lo w-frequency
roll-off and shall terminate in a 3-pin XLRM-type
output connector.
The microphone shall be mountable in an
included steel hanger that allows permanent
overhead installation for pickup of dialogue,
orchestras and choirs. The microphone shall be
5.61" (142.4 mm) long with a head diameter of
0.31" (8.0 mm). The microphone weight shall be 0.7
oz (20 grams) without cable. The microphone case,
cable and steel hanger shall be black [white].
The Audio-Technica AT933Rx/ML
[AT933RWx/ML] is specified.
One-Year Limited Warranty
Audio-Technica microphones and accessories purchased in the U.S.A. are warranted for one year from date of
purchase by Audio-Technica U.S., Inc. (A.T.U.S.) to be free of defects in materials and workmanship. In event
of such defect, product will be repaired promptly without charge or, at our option, replaced with a new product
of equal or superior value if delivered to A.T.U.S. or an Authorized Service Center, prepaid, together with the
sales slip or other proof of purchase date.
excludes defects due to normal wear, abuse, shipping damage, or failure to use product in accordance with
instructions. This warranty is void in the event of unauthorized repair or modification.
For return approval and shipping information,
1221 Commerce Drive, Stow, Ohio 44224.
Except to the extent precluded by applicable state law,
incidental, or special damages; any warranty of merchantability or fitness for particular purpose
expires when this warranty expires.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.
Outside the U.S.A., please contact your local dealer for warranty details.
Prior approval from A.T.U.S. is required for return.
contact the Service Department, Audio-Technica U.S., Inc.,
A.T.U.S. will have no liability for any consequential,
This warranty
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
Form No. 0309-9512-01- B/W P50892-01
1999 Audio-Technica U.S., Inc. Printed in U.S.A.
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