User Techniques and Applications
The 900 choir microphone is very light weight and can be hung in variety
of ways such as a through a small opening in a suspended ceiling,
suspended by a small hook in an overhead beam, or any means that is
convenient. Once the microphone is suspended, bend the gooseneck so
that the microphone points towards the desired sound source.
To prevent the microphone from turning away from the sound source
over time, the microphone can be secured with monofilament fishing
line. The microphone head has a small hole in it for this purpose. Secure
the ends of the line to opposite walls of the room and through the hole in
the microphone as shown in the photo on the front of this spec sheet.
Use the smallest available line and it will be virtually invisible in the
room.
SPECIFICATIONS FOR 900 / 900W
TWO-YEAR LIMITED WARRANTY
Omnitronics, LLC. (“ASTATIC”) hereby warrants that this product will be free of defects in material and
workmanship for a period of two years from the date of purchase. In the unlikely event a defect occurs
ASTATIC will, at its option, either repair or replace with a new unit of equal or greater value. You should
retain proof of purchase to validate the purchase date and return it with any warranty claim. Return warranty
claims carefully packed, insured and prepaid to the Service Department at the address listed below.
This warranty excludes exterior finish or appearance, damage from abuse, misuse of the product, use contrary
to ASTATIC’s instructions or unauthorized repair. All implied warranties or merchantability or fitness for a
particular purpose are hereby disclaimed and ASTATIC hereby disclaims liability for incidental, special or
consequential damages resulting from the use or unavailability of this product.
This warranty gives you specific legal rights and you may also have other rights which vary from state to
state. Some states do not allow the exclusion or limitation of incidental or consequential damages or
limitations on how long an implied warranty lasts, so the above exclusions and limitations may not apply
to you.
Note: No other warranty, written or oral is authorized by Omnitronics, LLC.
@ 1 kHz
Specifications
Generating Element:
Electret Condenser (Phantom Powered)
Polar Pattern:
Unidirectional (Cardioid)
Frequency Response:
40 Hz - 20 kHz
Output Level:
Open Circuit Voltage:
-50 dB (0 dB = 1 volt per microbar)
Impedance:
Low (500 ohms nominal)
Dynamic Range:
100 dB
Equivalent Noise Level:
Less than 30 dB, A weighted
Maximum SPL:
130 dB (1% THD, open circuit)
Powering:
Supply Voltage:
9 - 52 Vdc, positive pins 2 & 3 reverse polarity protected
Current Required:
Less than 2.0 mA over operating voltage range
Phasing
Positive Pressure on Diaphragm generates a positive voltage on pin
2 relative to pin 3
Finish:
900 - Durable black urethane paint
900W - Durable white urethane paint with flexible PVC covering
gooseneck
Cable:
900 - Miniature black cable with miniature 3 pin connector
900W - Miniature white cable with miniature 3 pin connector
Dimensions:
(See drawing on other side)
NET Weight:
205 grams (7.2 oz.) including external mic electronics
Architects’ and Engineers’ Specification
The microphone shall be an ASTATIC 900. The microphone shall be a
miniature gooseneck electret choir microphone. The frequency response
will be 40-20 kHz and the mic shall have a cardioid polar pattern.
The output level of the 900 shall be -50 dB (0 dB = 1 volt per microbar).
The included module will have a professional 3 pin XLR type connector
which also contains the microphones' electronic circuitry. The microphone
will operate from standard phantom power at any voltage from 9 to 52
Volts DC with a current consumption of less than 2 mA.
The dimensions of the microphone shall be 15.5 mm (39/64") in diameter
for the head, 6.4 mm (1/4") in diameter for the gooseneck. The overall
length of the mic will be 219 mm (8 5/8"). The weight shall be 93 grams
(3.3 oz.). The length of the supplied cable shall be 9 m (30'). The 900 will
have a durable black urethane painted finish. The 900W will have a
durable white urethane finish except for the gooseneck which shall be
covered with white vinyl shrink tubing. A foam windscreen will be supplied
as an accessory.
The ASTATIC Model 900 or 900W is specified.
