The diagram below shows the wiring schematic for the DM-1A. If using a male “XLR” type connector,
the GND(shield) should be connected to pin 1, the red(MIC+) connected to pin 2 and the black(MIC-)
connected to pin 3. When using an amplifier
that has VOX muting (such as a Davis ampli-
fier), the yellow(mute) and orange(mute) wires
should be cut or taped.
When using an amplifier without VOX muting,
the yellow and orange wires should be con-
nected to the “mute” terminal strip on the back
of the amplifier.
Option:
You may order a “XLR” type connector prewired to the DM-1A cable for an additional
charge. Call Customer Service for information regarding the specific connector desired and the
nominal prewiring cost.
NEW TECHNOLOGY
OLD RELIABILITY
J.W. Davis & Company
3030 Canton Street • P.O. Box 710219 • Dallas, Texas 75371-0219
Sales 800-527-5705 • Sales Fax 800-388-9106 • Corp 214-651-7341 • Corp Fax 214-939-0328 • www.jwd.com • [email protected]
The Mark of the professional...
Net Weight
Impedance
Sensitivity
Switches
Color/Finish
Construction
Dimensions
Connector
600 ohms
- 72 dB (ref 0 dB = 1V/ mBar)
Push-To-Talk
Lock-On
Matt Black
Base – Zinc die-casted
Base Cover – ABS plastic
1.09 lbs. (0.49 grams)
5.63"D x 3.47"W x 13"H
(143 mm x 88 mm x 329 mm)
9.8 ft. (3 m), 4 Conductor
Shielded Cable
Polar Pattern
Cardioid polar response with
noise canceling
Frequency Response
100 to 12,000 Hz
Element Type
Dynamic
Specifications
20
-50
-60
-70
-80
-90
-100
200
2k
20k
dB
Hz
Frequency Response
Magn dB re (0dB = 1V/
µ
Bar)
The dynamic desktop microphone shall be a J.W. Davis DM-1A or equivalent having a cardioid polar response pattern with noise
canceling and a frequency response of 100 Hz to 12,000 Hz. The impedance of the unit shall be 600 ohms with a sensitivity of -
72 dB (ref dB = 1V/ mBar). The design shall include a 9.8 foot cable with four conductors with a two conductor shielded balanced
line output and a separate pair of conductors for connection to a contact closure muting input. The unit shall have a nine inch
flexible gooseneck and a push-to-talk switch with a separate lock-on switch mounted in the base. The base construction shall be
zinc die-casted with a ABS plastic cover. The unit shall have a black matte finish with dimensions 5.63”(L) x 3.47”(W) x 13”(H) and
a weight of 1.09 pounds.
ARCHITECT’S AND ENGINEER’S SPECIFICATIONS
INSTALLATION INSTRUCTIONS
Polar Pattern
(1k Hz, 5k Hz, 10k Hz)
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