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AT8647QM/S
Microphone Shock-mount Plate with Switch
Features
• Intended for use with microphones mounted on lecterns, pulpits,
conference tables and other surfaces
• XLRF-type connector works with plug-in gooseneck
microphones with XLRM-type outputs
• Suspended panel isolates microphone from the mounting surface
• Built-in electronic mute circuit for phantom powered microphones
• Rugged mechanical switch provides push-on/push-off operation
• LED indicates microphone is on
• Operates on 24V to 48V DC phantom power
• Terminal screw output connections
• Low-prole design with low-reectance black nish for
minimum visibility
Description
Featuring a phantom-powered mute switch with a lighted “on” indicator,
the AT8647QM/S shock-mount plate effectively isolates mounted
microphones from impact vibration and mechanical noise normally
transmitted from the surface. It is intended for use with microphones
mounted on lecterns, pulpits, conference tables and similar surfaces.
Designed especially for UniPoint® and Engineered Sound® gooseneck
microphones, it may be used with other lightweight plug-in microphones
with XLRM-type outputs.
The AT8647QM/S incorporates a sturdy yet exible suspension panel that
provides mechanical isolation.
Installation
Following the dimensions in Figure 1, drill a 2" clearance hole and four
small pilot holes for screws in the mounting surface. A smooth, horizontal
(not tilted) surface is preferred for best performance.
Mounting & Connections
Connect a exible two-wire shielded cable, such as AT8300, to the
screw-terminals on the bottom of the AT8646QM/S, after bringing the
cable-end up through the 2" mounting hole. Note that the terminal order
is 1-3-2. The terminal numbers are on the circuit board and on the
terminal strip. Connect the shield to Terminal 1, balanced signal/phantom
power to Terminals 2 and 3. Connect the “positive” signal lead to Terminal
2, in accordance with industry convention. Make certain that the
screw-terminals are on the bare wire strands, not the insulation, and that
there are no bare wires or loose strands that could touch each other.
Once the wiring is complete, carefully position the shock mount on the
mounting surface and attach it with the included screws, or with #6
hardware. Secure the mic cable to the bottom of the mounting surface
near the shock mount, using a cable clamp or similar device. Leave a
small “loop” of cable hanging freely below the shock mount. If the cable
accessories
is pulled snug, it will “bypass” the suspension and reduce its effectiveness.
Securing the cable also helps protect the screw-terminal connections.
Mute Switch
The AT8647QM/S features a press-on/press-off switch that controls the
microphone, muting it by 50 dB at 1,000 Hz. The circuitry also operates a
light in the switch, powered by the 24 – 48V phantom source, to indicate
when the mic is “on.” Regardless of the switch position, the actual mic
operating voltage will be approximately 10-12V less than the phantom
source voltage.
Architect’s and Engineer’s Specications
The shock mount plate shall be designed to work with any dynamic
gooseneck or phantom powered condenser gooseneck microphone with
an integral 3-pin XLRM-type output connector. The plate shall have a large
shock isolator designed to minimize the pickup of mechanical noise from
the mounting surface and shall incorporate a rugged mechanical switch
controlling a phantom-powered electronic mute circuit. The switch shall
provide positive mechanical action and position indication to show on or
off operation. An LED indicator shall be located in the switch and shall
illuminate when the microphone is on. It shall operate from an external
24V to 48V DC phantom power source. The associated microphone shall
plug into the mounting plate via a 3-pin XLRF-type input connector and a
3-pin terminal strip shall be provided on the bottom of the plate for audio
output. The unit shall offer a low-reectance black nish. The unit’s
dimensions shall be: 80.5 mm (3.17") wide, 104 mm (4.10") deep, 15.5
mm (0.61") high. Weight of the shock mount less microphone, shall be
99 g (3.5 oz).
The Audio-Technica AT8647QM/S is specied.
Specications
Mute function Silent mute circuit designed to work with condenser
(powered) microphones
Switch Mechanical push-on/push-off
Input connector 3-pin XLRF-type connector
Output connectors Terminal Screws
Off (mute) attenuation* 50 dB at 1000 Hz, 35 dB at 100 Hz, 30 dB at 50 Hz
Phantom power 24-48V DC, 3 mA typical
requirements
Output impedance 360 ohms
Dimensions 80.5 mm (3.17") wide, 104.0 mm (4.10") deep,
15.5 mm (0.61") high
Weight 99 g (3.5 oz)
In the intere st of standards develo pment, A.T.U.S. offers full deta ils on its test method s to other industry pr ofessionals on request .
* 150 ohm sou rce, 100k ohm load
Specications are subject to change without notice.
76.7 mm
(3.02")
1
/64")
(3
90.5 mm
(3.56")
9
(3
/16")
13.8 mm
(0.54")
35
(
/64")
13.8 mm
(0.54")
35
(
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
©2010 Audio-Technica U.S., Inc. audio-technica.com 0001-0249-00
(3.17")
11
(3
/64")
40.3 mm
(1.58")
37
(1
/64")
/64")
PILOT HOLES
4 PLACES
(FRONT)
53.0 mm
66.8 mm
(2.63")
5
(2
/8")
(2.09")
(2
THRU-HOLE
3
/32")
2" DIA.
(50 mm)
40.3 mm
(1.58")
(137/64")
40.3 mm
(1.58")
(1
63.9 mm
(2.52")
(2
37
33
/64")
/64")
104.2 mm
(4.10")
(4
3
/32")