M55
HANGING CEILING MICROPHONE
Installation Guide
M55 EXPLODED VIEW
Slotted mounting nut
Brass strain relief
for outer cable
Adjustment nut
tightens by hand
M55 JUNCTION BOX ASSEMBLY
Male & female
phoenix connectors
JBM55 plenum rated box
Ceiling tile with 5/8” hole
M55
• Drill 5/8 inch hole in the ceiling tile.
• Open JBM55 box lid and place box on top of
5/8 inch hole in the ceiling tile. (See #1)
• Insert M55 threaded ceiling mount through
ceiling tile and into the JBM55 box
• Securely tighten the knurled nut.
(See #2)
• Insert plenum wire (Belden 9451P or 82761
or equivalent through strain relief (See #3)
and terminate to mating phoenix connector.
(See #4 and #5)
• Tighten plenum cable strain relief and close
lid of JBM55 box. (See #5)
Bottom view of junction box
• Loosen M55 knurled nut, adjust cable to
approximate desired length, and tighten nut.
(See #6)
• Tighten the plenum cable strain relief nut and
arrange excess M55 wire in box and close lid.
(see #7)
• Fine adjustments to microphone height can be
made easily from below ceiling by loosening
the M55 knurled nut, lengthening/shortening
wire and retightening knurled nut. (See #8)
INSTALLATION AND WIRING INSTRUCTIONS
1. Open lid of JBM55 box
and place on top of ceiling
tile drilled hole.
3
2
1
4. Wiring:
1 = Ground
2 = Blue (+)
3 = Yellow (-)
1
2
3
2. Insert ceiling mount
through ceiling tile hole, and
into JBM55 box then tighten
the knurled nut.
5. Connect Phoenix terminals.
3. Insert plenum wire
through strain relief nut,
then connect to the
Phoenix terminal.
Recommended cable:
Belden 9451P - .124” O.D. or
Belden 82761 - .116” O.D.
6. Loosen M55 knurled nut
(above), adjust cable to
approximate desired length,
and tighten nut.
7. Tighten the strain relief
nut. Arrange excess wire in
box and close lid.
8. For nal adjustment,
loosen knurled nut,
adjust cable length,
and tighten nut.
SEISMIC RESTRAINT INSTRUCTIONS
Seismic Restraint Diagram
Beam, eyebolt
or wall
Cable stay barrel
Wrap the cable through
fastening point (beam,
eyebolt).Next, slip the cable
through the top of cable stay
barrel pulling excess cable
until taut.
Plenum rated box
Cable release pin
Cable
Cable
Cable stay barrel
Plenum rated cable
To loosen or disassemble
cable, depress the cable
release pin and pull cable to
desired length.
Push pin in
to release
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