Audio-Technica AT935AMRX-C User Manual

AT935AMRx/C

Cardioid

Description

The AT935AMRx/C is a wide-range condenser
microphone with a cardioid polar pattern. It is
designed for quality sound reinforcement, profes­sional recording, television, and other demanding
sound pickup applications. The small-diameter
gooseneck design permits highly flexible positioning
while maintaining a smooth, well-contoured
appearance. The AT935AMRx/C features a 5/8"-27
threaded flange that allows it to mate with the
threads of a standard microphone desk or floor stand.
A 5/8"-27 threaded stud is also provided so it can be
secured to a permanent mounting surface.

The microphone features an 11' (3.3 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°.

Audio-Technica design engineers have
utilized the newest low-mass diaphragm
technology in the quest for superior performance.
The permanent charge is now on the fixed back
plate, rather than the moving element. With A-T
fixed-charge “back plate” construction, a gold­vaporized diaphragm just 2 microns thick
(about .000079") can be used. This considerably
reduces moving mass, thus improving frequency
response and transient response while reducing
distortion.

The microphone is enclosed in a rugged
housing with a low-reflectance black finish.

Installation and Operation

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 2, 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. 3). 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.

By removing an attached AT8533x power
module, the cable from the microphone can be
routed out the bottom of the microphone instead
of exiting from the side as supplied (Fig. 1).

Figure 1. Cable routing

The provided foam windscreen simply
slips over the head of the microphone, effectively
reducing wind noise or “popping” when used
extra close.

The small-diameter gooseneck is easy
to manipulate for proper positioning. Heavily
lubricated, it operates smoothly and quietly.
Should the unit become noisy with prolonged
use, apply a light machine oil directly on the
gooseneck area affected.

While a modern condenser microphone
is not unduly sensitive to the environment,
temperature extremes can be harmful. Exposure
to high temperature can result in gradual and
permanent reduction of the output level. 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

1"

1

Shield strands,
fully twisted

/2"

Figure 2

500

200100

Frequency in Hertz

12" or more on axis (flat)
Roll-off

Yellow-Yellow

Red-Red

1

/8" strip reds

and yellows

1k

Terminal
screws

Case
grounding
contact

2k

Shield

10k

PC board

switch side

20k

5k

SYR

Figure 3

Yellow-Yellow
Red-Red

Miniature
Condenser
Gooseneck
Adapter-mount
Microphone

Response in dB

AT935AMRx/C

0.48"

12.2 mm

6.77"

172.0 mm

91.0 mm

3.58"

0.83"

21.0 mm

2.6 mm

0.10"

1.18"

30.0 mm

23.0 mm

0.91"

AT935AMRx/C Specifications

Element Fixed-charge back plate

†

permanently polarized condenser

Polar Pattern Cardioid (Unidirectional)
Frequency Response 40-20,000 Hz
Low-frequency Roll-off 150 Hz, 6 dB/octave
Open Circuit Sensitivity –43 dB (7.0 mV) re 1V at 1 Pa*
Impedance 200 ohms (1000 ohms without power module)
Maximum Input Sound Level 138 dB SPL, 1 kHz at 1% T.H.D.
Dynamic Range (Typical) 111 dB, 1 kHz at Max SPL
Signal-to-noise Ratio

1

67 dB, 1 kHz at 1 Pa*

Switch Flat response, low-roll-off (recessed)
Phantom Power Requirements 9-52V DC, 2 mA typical
Weight

Microphone (less cable) 1.8 oz (50 grams)
Power Module 2.1 oz (60 grams)

Dimensions

Microphone 6.77" (172.0 mm) long, 0.48" (12.2 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 11' (3.3 m) long (permanently attached to microphone),

Accessories Furnished AT8102 two-stage foam windscreen; AT8533x power

Optional Interchangeable AT853H-ELE hypercardioid (100°)
Elements AT853ML-ELE MicroLine

0.10" (2.6 mm) diameter, 2-conductor, shielded cable;
free end attaches to screw terminals in power module

module; AT8425
element adapter (for C/H/O/SC elements)

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.

5

/8"-27 threaded mounting stud;



(90°)

270

LEGEND

200 Hz

240

300

1 kHz
5 kHz
8 kHz

Polar Pattern

0

330

210

180

SCALE IS 5 DECIBELS PER DIVISION

Dimensions

30

60

90

120

150

The microphone shall be a fixed-charge condenser with a cardioid polar pattern and

Architects and Engineers Specifications

a frequency response of 40 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 7.0 mV at 1 kHz, 1 Pascal. Output shall be low impedance balanced
(200 ohms).

pigtail output. The pigtail output shall connect to a power module via internal solderless screw

The microphone shall have a permanently-attached 11' (3.3 m) miniature cable with a

terminals. The power module shall include a switch for low-frequency roll-off and shall terminate
in a 3-pin XLRM-type output connector.

The microphone shall be a small-diameter gooseneck design, with an overall length of

6.77" (172.0 mm). Head diameter shall be 0.48" (12.2 mm). The microphone shall include a

5

/8"-27 threaded flange to mate with the threads of a standard microphone desk or floor stand.
A 5/8"-27 threaded stud shall be provided for permanent installation to a mounting surface. The
microphone weight shall be 1.8 oz (50 grams) without cable. Finish shall be low-reflectance black.

The Audio-Technica AT935AMRx/C 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.

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

Outside the U.S.A., please contact your local dealer for warranty details.

Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224

Audio-Technica Limited, Old Lane, Leeds LS11 8AG England

Form No. 0309-9513-01-B/W P50893-01

 1999 Audio-Technica U.S., Inc. Printed in U.S.A.