Audio-Technica specifications AT804 Omnidirectional Dynamic Microphone

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

•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.

Polar Pattern

	0
330	30
300	60
270	90
240	120
210	150
	180

SCALE IS 5 DECIBELS PER DIVISION

LEGEND

200 Hz same as 1 kHz

1kHz

5kHz

8kHz

			Frequency Response
									in dB
								10 dB	Response
50	100	200	500	1k	2k	5k	10k	20k
			Frequency in Hertz

LEGEND 12" or more on axis

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