Bosch Prosound Ceiling Speakers
Installation and User Instructions
en LC2-PC30G6-4
LC2-PC30G6-8
LC2-PC30G6-8L
LC2-PC60G6-8H
LC2-PC60G6-10
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Table of Contents
Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Important Features . . . . . . . . . . . . . . . . . . . . . . . . 1
Model Summary . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Packing List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Product Feature Identification. . . . . . . . . . . . . . . . 3
Installation and Wiring . . . . . . . . . . . . . . . . . . . . . 4
Step 1 — Cut the Hole . . . . . . . . . . . . . . . . . . 4
Step 2 — Install C-Ring
and/or Tile Rails . . . . . . . . . . . . . . . . . . . . . 4
Step 3 — Attach Wiring to the
Ceramic Connector . . . . . . . . . . . . . . . . . . . 5
Step 4 — Mount the Speaker into the
Ceiling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 5 — Connect an Auxiliary
Support Line . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 6 — Adjust Tap Selector. . . . . . . . . . . . . . 6
Step 7 — Attach the Grille. . . . . . . . . . . . . . . . 7
Appendix A — Painting the Speaker. . . . . . . . . . . 8
Appendix B — Product Specifications . . . . . . . . 10
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Welcome/Safety/Important Features
Welcome
Important Features
Thank you for purchasing Bosch loudspeakers. Read
through this manual to familiarize yourself with fea-
tures, applications, and precautions before you use
these products.
•
•
•
•
Model for model, has superior performance to
competing brands
Comes with both 70V/100V or 8-ohm operation
standard on every model
Bosch loudspeakers use innovative design and
materials to provide premium-level performance in a
flush-mount ceiling format. Four models comprise
by Bosch: the LC2-PC30G6-4 with a 4-inch LF
driver and a .75-inch, titanium-coated tweeter with
waveguide; the LC2-PC30G6-8 with an 8-inch LF
driver and a 1-inch titanium-coated tweeter with
waveguide; the LC2-PC60G6-8H with a fully wave-
guide-loaded 8-inch LF driver and a 1-inch titanium
coated tweeter; and the LC2-PC60G6-10, a true
ceiling-mounted subwoofer designed to augment and
extend the full-range model’s low-frequency
response.
Includes all installation accessories
commonly needed for most jobs
Designed for use in voice alarm systems.
Safety First
Suspending any object is potentially dangerous
and should only be attempted by individuals who
have a thorough knowledge of the techniques and
regulations of rigging objects overhead. Bosch
strongly recommends that all speakers be suspended
taking into account all current national, federal,
state and local regulations. It is the responsibility of
the installer to ensure that all speakers are safely
installed in accordance with all such regulations.
When speakers are suspended, Bosch strongly rec-
ommends that the system be inspected at least once
a year. If any sign of weakness or damage is detect-
ed, remedial action should be taken immediately.
The user is responsible for making sure that the sup-
porting surfaces, and any additional hardware used,
is capable of supporting the loudspeaker. Any hard-
ware used to suspend a loudspeaker array that is not
provided by/associated with Bosch is the responsibil-
ity of others.
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Model Summary/Packing List
LC2-PC30G6-4
Packing List (Figure 1)
Perfect for conventional rooms. It has excellent
bandwidth in an esthetically very unobtrusive instal-
lation profile. Its compact design fits in tight areas.
Its 4-inch woofer and waveguide-coupled, titanium-
coated dome tweeter give smooth, wide frequency
response. The enclosure is ported and tuned to pro-
vide surprising bass response in such a compact
package. Features an easy 3-point mounting system
for quick installations.
Figure Quantity
Part
A
B
C
D
E
F
2
4
2
2
1
4
1
2
Speaker system
Tile rails
C-ring support
Grille
Owner’s manual
Support ring screws
Cutout template
Paint Shield
LC2-PC30G6-8
The LC2-PC30G6-8 has a specially tuned enclosure
and 8-inch woofer to provide amazing bass response.
The 1-inch waveguide-coupled tweeter give smooth
controlled coverage out to 20 kHz. Perfect for installa-
tions where a flush-mount design is desired but demand
for high-quality audio exists. Features a 4-point mount-
ing system to make installations fast and easy.
G
H
LC2-PC30G6-8L
The LC2-PC30G6-8L is the same as the LC2-
PC30G6-8 but in a low-profile installation package.
Ideal for tight ceiling spaces.
A (x2)
E
LC2-PC60G6-8H
C(x2)
The LC2-PC60G6-8H is ideal for high ceilings and
reverberant “problem” rooms. Its exclusive ported, wave-
guide-coupled, 8-inch driver provides excellent intelligi-
bility and definition. The LC2-PC60G6-8H patent-
pending design provides great coverage control through-
out the voice range and above. No other ceiling speaker
system provides the combination of excellent pattern
control, wide bandwidth, high power handling, and
compact design like the LC2-PC60G6-8H.
D (x2)
G
F(x4)
B(x4)
LC2-PC60G6-10
H(x2)
The LC2-PC60G6-10 packs a 10-inch subwoofer in
a tuned high performance enclosure to give amazing
low frequency performance down to 45Hz! It is one
of the few quick-mount ceiling TRUE subwoofers
available. Flexible installation and powerful low-end
performance make it the ideal mate to any ceiling
model.
Figure 1: packing list
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Product Feature Identification
Bosch Ceiling Series Systems (sold in pairs)
Model
Description
LC2-PC30G6-4
LC2-PC30G6-8
4" coaxial speaker with horn-loaded, Ti-coated tweeter
8" coaxial speaker with horn-loaded, Ti-coated tweeter
LC2-PC30G6-8L Same as LC2-PC30G6-8 above except with low-profile backcan
LC2-PC60G6-8H 8" waveguide-coupled coaxial speaker with horn-loaded, Ti-coated tweeter
LC2-PC60G6-10 10" High performance subwoofer
Product Feature Identification
Steel
backcan
Ceramic connector
Seismic tab
(auxiliary support ring)
Grille safety tether
Grille
Tap
selector
Mounting
screws
Grille safety
tether hole
Rotating mounting tabs
Figure 2: Bottom of speaker
Figure 3: Top of speaker
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Installation and Wiring
The Bosch mounting system has been designed so
that, if necessary, the installation can be done from
beneath the ceiling. In some cases with a suspended
ceiling grid, however, it may be easier to access from
both the top and bottom of the ceiling tile during the
installation process. Typical installation hardware
needed for either suspended ceilings or sheetrock ceil-
ings is included. The ceiling speaker assembly is held
in place by mounting tabs that securely grip the ceil-
ing material. Input wiring is attached to a removable
terminal block connector that can be pre-wired if nec-
essary before speaker installation to speed up the
installation process.
Step 1: Cut the Hole (Figure 4)
For suspended tile or sheetrock ceilings, cut out the
hole either by tracing the cardboard template or
with a circular cutter set to the appropriate cutout
size. If the wire has been pre-installed, pull the
wiring through the cutout hole.
Figure 4: Cut ceiling hole
Step 2: Install C-Ring and/or Tile
Rails (Figure 5)
All Bosch speakers come packaged with two types of
backing hardware: a C-ring and two tile rails.
For suspended ceiling installations, insert the
C-ring through the hole cut in the ceiling tile. Place
the C-ring around the hole with the tabs located as
shown in Figure 5. Insert the tile rails through the
cut hole in the ceiling tile. Snap the two rails into
the two tabs in the C-ring and align the rails so that
the ends extend OVER the T-channel grid on the
side of the tile. Secure the rails onto the C-ring tabs
by inserting a screw though each tab into the rail, as
shown in Figure 5.
Figure 5: Secure rails to C-Ring
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Installation and Wiring
INSTALLATION NOTE: TILE RAILS AND
C-RING
When adding a subwoofer, be sure to observe the cor-
rect polarity. The LC2-PC60G6-10 subwoofer has
been designed for optimum performance when used
with the LC2-PC30G6-4. In order to maximize the
low frequency output when used with the LC2-
PC30G6-8, LC2-PC30G6-8L or LC2-PC60G6-8H,
the polarity of the LC2-PC60G6-10 subwoofer
should be reversed. See Figures 7 and 8.
Each speaker comes with two tile rails which are
designed to fit either standard 24-inch-wide or 600-
mm-wide tiles. It is important to note that the tile rail
pieces do not actually attach to the T-grid struts. The
ends of the rails sit OVER the T-grid strut. Normally,
the tile supports the rails. The tile rails are pre-
punched at regular intervals with holes along their
length. This allows the C-ring to be positioned at any
point along the rail. If the tile comes out or falls
apart, the ends of the support rails fall onto the T-
grid, which prevents the speaker assembly from
falling.
Always use all included support hardware when
installing into suspended ceiling tiles to make sure
the installation is secure.
For sheetrock ceiling installations, the C-ring
should be used by itself to reinforce the ceiling
material and to spread out the pressure from the
speaker hold-down tabs. Guide the C-ring through
the cut hole in the ceiling, and place it on the back
side of the hole before inserting the speaker.
LC2-PC60G6-10 Subwoofer LC2-PC30G6-4 Loudspeaker
Figure 7: Subwoofer polarity with
LC2-PC30G6-4
Step 3: Attach Wiring to the
Ceramic Connector (Figure 6)
Insert the bare end of wire into the appropriate con-
nector terminals as described below and screw down
the hold-down screw until tight, using a small
screwdriver.
LC2-PC60G6-10 Subwoofer
LC2-PC30G6-8/
LC2-PC60G6-8H/LC2-PC30G6-8L-
Loudspeaker
Figure 8: Subwoofer polarity with LC2-
PC30G6-8/LC2-PC60G6-8H/
LC2-PC30G6-8L
Figure 6: Tighten with screwdriver
~
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Installation and Wiring
INSTALLATION NOTE: CEILING TILE
CAUTION
INSTALLATION NOTE: MOUNTING TABS
For each attachment screw, first turn one half-turn
counterclockwise to release the mounting tab from
its guide.
When mounting the units into 2'˘2' or 2'˘4' sus-
pended ceiling tiles, DO NOT install them in light-
weight fibreglass-type tiles without full secondary
support for the speaker as noted in Step 6. Such tiles
are not designed to support any substantial weight.
Speaker installation without secondary support will
cause the tile to sag and distort, even with the tile
bridge installed. The secondary support line at the
rear of the speaker MUST be strung taut in these sit-
uations and MUST remove most of the force of the
speaker on the tile to ensure that the speaker does
not deform the tile.
Step 5: Connect an Auxiliary
Support Line (Figure 11)
Note the support ring on the back of the speaker.
The ring allows for connection to a independent
and secure anchor point. Construction codes often
require the use of this secondary support point.
Step 4: Mount the Speaker Into
the Ceiling (Figure 9)
Push the speaker into the ceiling hole until the front
baffle rim is flush with
the ceiling. Tighten the
mounting tabs by turning
the screw clockwise until
the speaker is secure.
Figure 11: Attach auxiliary support line
Please note that the first
clockwise quarter-turn
rotates the attachment
Step 6: Adjust Tap Selector
(Figure 12)
The tap selector switch is located on the front baffle.
Adjust the speaker to the appropriate tap setting
before installing the grille. In some 70V/100V con-
stant voltage installations it is advisable to leave the
grilles off if final speaker audio level balance adjust-
ments are to be made later. After the levels are
adjusted the grilles can then be installed.
tabs outward. The
remaining turns tighten
the tabs down onto the
back of the ceiling surface
(see Figure 10).
Figure 9: Mount
speaker into ceiling
Figure 12: Adjust tap selector
(left: LC2-PC30G6-4/LC2-PC30G6-8/
LC2-PC30G6-8L; right: LC2-PC60G6-10/
LC2-PC60G6-8H)
Figure 10: Tighten mounting tabs
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Installation and Wiring
LC2-PC30G6-4, LC2-PC30G6-8 and
LC2-PC30G6-8L
In addition to the 8-ohm setting, the power taps are
30 W, 15 W, 7.5 W, and 3.7 W at both 70.7V and
100V, with a 1.8 W tap for 70.7V only.
LC2-PC60G6-8H and LC2-PC60G6-10
In addition to the 8-ohm setting, the power taps are
60 W, 30 W, and 15 W at both 70.7V and 100V,
with a 7.5 W tap for 70.7V only.
Step 7: Attach the Grille (Figure 13)
INSTALLATION NOTE:
GRILLE SAFETY FEATURE
Bosch grilles features a unique safety tether to pre-
vent the grille from falling if the grille is removed or
comes loose after installation.
First, install the grille’s safety tether by pushing
the grille fastener into the hole in the front of the
baffle (see Figure 13). Second, press the grille into
place until the front of the grille is flush with the
rim of the baffle. Make sure the grille is securely
seated to prevent it from vibrating loose.
If you need to remove the grille, the easiest way is
to insert two bent paper clips or other pointed objects
into holes in the grille, then apply slow even pressure
to pull down on the grille until that section of the
grille comes out slightly. Continue the same proce-
dure around the perimeter of the grille, loosening a
portion at a time until the grille is removed.
1
2
Figure 13: Attach the grille
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7
Appendix A — Painting the Speaker
If the speaker is installed in an area where the inte-
rior design requires a color match, these speakers
are simple to paint. The speakers can accommodate
almost any type of latex or oil-based paint. The
bezel/rim can be painted before installation or after
mounting into the ceiling.
Painting Process
Clean the rim and grille with mineral spirits or
other light solvent. Do not use harsh solvents such
as gasoline, kerosene, acetone, or other chemicals. If
you use these cleaners you may permanently damage
the enclosure. Also, don’t use abrasives products
such as sandpaper or steel wool.
Either by rolling or spraying, apply two or more
thin coats of paint. If you are spraying, hold the
spray can at the angles shown in Figure 14.
180˚
45˚
45˚
Baffle
180˚
Can
(do not
paint)
Figure 14: Spray-painting angles
If you are painting the grille also, you must first
remove the internal grille cloth. Spray painting is
strongly recommended. If the grille is rolled or
brush painted, the grille may become clogged with
paint and the sound quality will suffer. After the
paint has dried, replace the internal grille cloth.
If you wish to paint the speaker along with the
ceiling after installation, insert a plastic or cardboard
paint shield into the front of the speaker to mask
the drivers and internal baffle, paint the speaker,
then remove the shield.
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Appendix B — Product Specifications
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Appendix B — Product Specifications
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