200 Hz
1 kHz
5 kHz
8 kHz
LEGEND
same as 1 kHz
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
90
60
120
30
150
210
240
270
300
330
180
0
Frequency in Hertz
Response in dB
10 dB
20k
10k
5k
2k
1k
500
200100
50
Frequency Response
LEGEND
12" or more on axis
• Ideal for interviews, sportscasting and as the “mono” mic when
used in conjunction with a stereo microphone
•Omnidirectional polar pattern provides natural reproduction of
surrounding ambience
• Rugged housing with hardened-steel grille stands up to field use
• Internal shock mounting minimizes handling and cable noise
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.
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 Ground Audio “+” Audio “-”
XLR Pin 1 Pin 2 Pin 3
1/4" “TRS” Sleeve Tip Ring
1/4" Sleeve Tip 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.
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.
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
AT804 OMNIDIRECTIONAL DYNAMIC MICROPHONE
