Back Box / Mounting Device
UL Listed
0401.1—FLUSH MOUNTED, ROUND
ERD-8
ERD8U
ERD8U Shown
GENERAL DESCRIPTION
The Quam ERD-8 or ERD8U is a UL Listed (UUMW),
round, steel loudspeaker back box. A circular, molded
expanded polystyrene damping pad is fitted to the inside
top of the enclosure.
Finish: White baked epoxy hybrid.
INTENDED USE
Use with recommended additional Quam components to
complete a loudspeaker assembly used in an indoor
environment.
SYSTEM COMPONENTS
N/A
RECOMMENDED ADDITIONAL QUAM COMPONENTS
0402 - Loudspeaker Mounting Devices, SSB-2
0401.2 - Speaker, Transformer, Baffle & Volume Control
OR
0104.3 - Speaker, Transformer, Baffle & Universal Knob
Control
MECHANICAL SPECIFICATIONS
Height
Diameter
(Flange Max)
Bottom Diameter
Top Diameter
Internal
Displacement
ATTACHMENT POINTS
ERD-8
ERD8U
ELECTRICAL ACCESS
ERD-8
ERD8U
TOP
1x
1x
TOP
--
--
4-1/2”
12-5/16”
9-3/4”
8-1/2”
275 cu. in.
SIDE
4x welded
2x snap-in
SIDE
4x - 90° apart
4x - 90° apart
All devices connect with twist-tabs to support bridge.
Recommended construction sequences, installation instructions and A&E
Specifications are available in various formats on the Quam Architects’ and
Engineers’ Resources CD or on the web at: www.quamspeakers.com
234 East Marquette Road, Chicago, IL 60637
Phone: (800) NEED NOW Fax: (888) NEED NOW
(800) 633 - 3669
(888) 633 - 3669
E-Mail: neednow@qnc.com
www.quamspeakers.com
JO
Quam-Nichols Company
BS
IBEW
W
LU
STAY
H
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1031
TH
START
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Since 1930
TERD8_ERD8U_11MR04
© 2011 Quam-Nichols Company Quam-Nichols reserves the right to make changes and/or improvements to its products at any time and without notice.
04
BACK BOXES / MOUNTING DEVICES
RE
GR
O
INSTALLATION
INSTRUCTIONS
11-3.24
6 4 8 5
ERD8 Series Back Can (UL Listed UUMW) intended for use with QUAM SSB-x Tile Bridge
INTENDED USE:
All versions: Indoor environment, COMPLETE ASSEMBLY AS
SHOWN mounted parallel to floor plane in a 24” wide,
suspended ceiling tile grid; mount height 18’ or less above
floor plane.
Program material: Signal tones, voice and music.
UL Listed 1480
City of Chicago Approved
“ Material and construction permits use
where ceiling plenum is part of the air
handling system”
1. Preparation:
- Cut 8-1/2” square hole in the tile using tile bridge as a
template.
(Refer to specific tile bridge instructions for details)
- Bend up 4x horseshoe tabs on tile bridge
- Position tile bridge on TOP of tile, legs like:
Bend 8x locator tabs around tile in opening
- Install speaker /baffle on opposite of ceiling tile and
fasten to tile bridge/tile assembly with 4x #8-32 screws
provided with speaker/baffle assembly.
2. Termination:
-
Chose entry point to back can and knock out either 1/2”
or 3/4” as required
- Install UL Listed metallic enclosure entry fitting into
back can knockout to receive plenum cable or plenum
Whip.
- Feed supply cable through whip to connector.
- If transformer on assembly is listed as TBLU, install per
wiring diagram below. For other QUAM transformers,
go to
www.QuamSpeakers.com / Resources/ Wiring
- Insulate all unused taps from each other, the enclosure
and electrical ground.
3. Installation in grid:
NOTE! AHJ/ local codes may require tie-off to structure.
ERD8U Back Can Only:
Snap in 2x tie-off tabs as shown
in illustration at left.
- Orient back can over tile bridge, lining up slots with the
4x horseshoe tabs.
- With pliers, twist tabs 1/2 turn, securing back can to
bridge assembly.
- Tie-off using straps on back can as required
NOTE! AHJ/ local codes may require tie-down to grid.
Create a hole in the T-bar next to the end of the tile bridge
rails; securing with wire through the hole in the end of
the rail.
SNAP-IN TIE OFF STRAPS (2)
HORSESHOE TAB (4)
BACKBOX
8Ω
Brown
5W @ 25V
only
Red
2.5W @ 25V
only
Orange 1.25W @ 25V
only
Green
0.63W @ 25V
or
5W @ 70.7V
White
0.32W @ 25V
or
2.5W @ 70.7V
Blue
only
1.25W @ 70.7V
Gray
only
0.63W @ 70.7V
Violet
only
0.32W @ 70.7V
BLACK ( Common )
QUAM Model TBLU
234 East Marquette Road
Chicago, IL 60637
Phone: (800) NEED NOW Fax: (888) NEED NOW
(800) 633 - 3669
(888) 633 - 3669
© 2011 Quam-Nichols Company Quam-Nichols reserves the right to make changes and/or improvements to its products at any time and without notice.
V
BRIDGE
ALL COMPONENTS
MUST BE USED
and ASSEMBLED
as shown to be
U.L. COMPLIANT
FPGA/CPLD
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