Audio Technica Omnidirectional Dynamic At804 Users Manual

OMNIDIRECTIONAL DYNAMIC AT804 at804_english

at804 e1ce6c40-2a58-4f53-8734-d25d9c2061bf Audio-Technica Microphone AT804 User Guide |

2015-02-06

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AT804

OMNIDIRECTIONAL DYNAMIC MICROPHONE
AT804 SPECIFICATIONS†
ELEMENT

Dynamic

POLAR PATTERN

Omnidirectional

FREQUENCY RESPONSE

50-15,000 Hz

OPEN CIRCUIT SENSITIVITY

–49 dB (3.5 mV) re 1V at 1 Pa*

IMPEDANCE

600 ohms

WEIGHT (less accessories)

7.5 oz (213 g)

DIMENSIONS

5.94" (151.0 mm) long,
1.42" (36.0 mm) head diameter

OUTPUT CONNECTOR

Integral 3-pin XLRM-type

ACCESSORIES FURNISHED

AT8405a stand clamp for 5/8"-27
threaded stands; soft protective
pouch

†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 /cm 2 = 10 microbars = 94 dB SPL
Specifications are subject to change without notice.

• Ideal for interviews, sportscasting and as the “mono” mic when
used in conjunction with a stereo microphone

Polar Pattern

Frequency Response

0
30

330

300

60

10 dB
90

270

• Rugged housing with hardened-steel grille stands up to field use
240

• Internal shock mounting minimizes handling and cable noise

120

50
150

210

100

200

500

1k

2k

5k

10k

20k

Frequency in Hertz

180

Output from the microphone’s XLRM-type connector is low
impedance (Lo-Z) balanced. The signal appears across Pins 2
and 3; Pin 1 is ground (shield). Output phase is “Pin 2 hot” –
positive acoustic pressure produces positive voltage at Pin 2.

SCALE IS 5 DECIBELS PER DIVISION

LEGEND

LEGEND

12" or more on axis

200 Hz same as 1 kHz
1 kHz
5 kHz
8 kHz

To avoid phase cancellation and poor sound, all mic cables must be
wired consistently: Pin 1-to-Pin 1, etc. For a high-impedance (Hi-Z)
mic input, connect a Lo-Z balanced cable to a Hi-Z matching
transformer (A-T CP8201 or equal) at the equipment input.
Plug Type
XLR
1
/4" “TRS”
1
/4"

Ground
Pin 1
Sleeve
Sleeve

Audio “+”
Pin 2
Tip
Tip

Audio “-”
Pin 3
Ring
Sleeve

The high sensitivity of the AT804 assures useful output and an
excellent match to most input sources. In some cases, however, an
attenuator such as the Audio-Technica AT8202 may be required
between the microphone and preamplifier to avoid overloading
sensitive input stages.
Take care to keep foreign particles from entering the windscreen.
An accumulation of iron or steel filings on the diaphragm, and/or
foreign material in the windscreen’s mesh surface, can degrade
performance.

Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P51661-EN

©2004 Audio-Technica U.S., Inc.

Printed in Japan

Response in dB

• Omnidirectional polar pattern provides natural reproduction of
surrounding ambience
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