INSTRUCTION MANUAL
CEILING SPEAKER SYSTEM
F-2852C
TABLE OF CONTENTS
1. SAFETY PRECAUTIONS .......................... 2
2. GENERAL DESCRIPTION ........................ 3
3. FEATURES ................................................ 3
4. NOMENCLATURE AND DIMENSIONS .... 4
5. INSTALLATION ......................................... 5
7. REPAINTING THE SPEAKER .................. 10
8. ABOUT THE INPUT OVERLOAD
PROTECTION CIRCUITRY ...................... 10
9. SPECIFICATIONS .................................... 11
Accessories ............................................... 11
Optional Components ................................ 11
6. REMOVING THE SPEAKER
FOR MAINTENANCE ................................. 9
Please follow the instructions in this manual to obtain the optimum results from this unit.
We also recommend that you keep this manual handy for future reference.
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2. GENERAL DESCRIPTION
The F-2852C is a 2-way, flush-mounted ceiling speaker that offers a wide frequency range and high-quality
sound output.
Use of its supplied and optional mounting hardware permits versatile mounting to match a wide range of
applications and installation locations.
3. FEATURES
• Two-way, bass-reflex speaker system designed to provide a wide frequency range and high power handling
capability.
• Ideal for locations that have high ceilings or require true-to-life sounds.
• Uniform sound output levels are achievable not only in the position directly under the speaker, but also over
a wide radius. (Coverage angle is approximately 110°.)
• Because the speaker is provided with both low- and high-impedance operating capability, it can be used in
many different applications. Front panel-mounted input selector switch permits easy verification and change
of current impedance settings, even after installation.
• Easy installation. Can be quickly and accurately mounted to ceilings and walls.
• Rotating front grille can be installed quickly and conveniently.
• Attractive exterior design specially created by an interior designer blends naturally with any architectural
space, enhancing the immediate area's sense of harmony.
• Optional mounting hardware permits installation in weak ceiling panels.
3
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4. NOMENCLATURE AND DIMENSIONS
Unit: mm (inches)
[Front]
[Side]
38 (1 1/2)
Front grille (accessory)
227 (8 15/16)
[Rear]
Safety wire (accessory)
Safety wire hook
Detachable input connector
Mounting hole: ø250 (9 27/32)
[Ceiling mounting]
Ceiling reinforcement ring
(accessory)
Ceiling panel
4
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5. INSTALLATION
The F-2852C ceiling speaker can be mounted in 3 different configurations:
• Direct mounting to a ceiling panel
Use the supplied ceiling reinforcement ring.
• Mounting to a ceiling frame
Use the supplied ceiling reinforcement ring in conjunction with the optional HY-TB1 Tile Bar Bridge.
• Mounting to an anchor bolt
Use the supplied ceiling reinforcement ring in conjunction with the optional HY-AH1 Anchor Hanging
Bracket.
Mount the speaker using the most appropriate method for the ceiling panel or installation location.
Step 1. Cut a ø250 mm (9 27/32") hole in the ceiling.
ø250 5 mm (9 27/32 13/64")
Use the supplied paper pattern to position and trace the hole.
Ceiling panel
Step 2. Connect the speaker cable to the detachable input connector.
Tip
The following matching cable types are recommended:
• Solid copper wire:
ø0.5 – ø1.6 mm (equivalent to AWG 24 – 14)
• Stranded copper wire: 0.2 – 2.5 mm2 (equivalent to AWG 24 – 14)
Detachable input
connector
Speaker unit
2-1. Remove the detachable input connector from the
speaker's wiring socket, and loosen the screw of the
terminal to be used.
2-2. Insert the stripped cable end into the terminal and tighten the terminal screw with a screwdriver.
[If not bridging] [If bridging]
From Amplifier
Caution
If not making bridge connections,
be sure to tighten unused terminal
screws to avoid their vibration.
5 mm
(13/64")
To the
next speaker
5
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Step 3. Install mounting hardware on the ceiling.
3-1. Direct mounting to a ceiling panel
Mounting hole
Fold the supplied ceiling reinforcement ring in half*
and insert it through the mounting hole in the
ceiling panel, then open it with its tabs facing up.
Place the ring on the ceiling panel aligning it with
the mounting hole.
Ceiling reinforcement ring
(accessory)
* The reinforcement ring is too large to be inserted
into the mounting hole unless folded.
Reinforcement ring placed on ceiling panel
These tabs must
face upward,
away from the hole.
3-2. Mounting to a ceiling frame
Use the supplied ceiling reinforcement ring in conjunction with the optional HY-TB1 Tile Bar Bridge.
Note
Refer to the instruction manual included with the HY-TB1 for the correct ceiling mounting procedure.
[Installed HY-TB1]
HY-TB1 (optional)
Ceiling frame
Ceiling reinforcement ring (accessory)
Ceiling panel
3-3. Mounting to an anchor bolt
[Installed HY-AH1]
Use the supplied ceiling reinforcement ring in
conjunction with the optional HY-AH1 Anchor
Hanging Bracket.
Anchor bolt
Note
Refer to the instruction manual included with the
HY-AH1 for the correct mounting procedure.
HY-AH1
(optional)
Ceiling reinforcement
ring (accessory)
Ceiling panel
6
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Step 4. Attach a safety wire to prevent the speaker from accidentally falling.
Secure C-channel bar or
anchor bolt in the ceiling
To attach, tie one end of the supplied
safety wire around the speaker's safety
wire hook, and tie its snap ring around
Safety wire
(accessory)
a secure C-channel bar or anchor bolt
in the ceiling.
Safety wire hook
Speaker unit
Detachable input
connector
Step 5. Plug the detachable input connector into the speaker's
wiring socket.
Speaker unit
Step 6. Mount the speaker.
Caution
In
Before mounting, check to be sure that the speaker's
4 mounting tabs are turned inside the unit as shown in
the figure.
Out
If turned outward, the speaker cannot be inserted
through the mounting hole.
Mounting tab
6-1. Insert the speaker through the mounting hole till it contacts the ceiling panel.
While doing so, avoid directly touching the speaker's
diaphragm and tweeter.
Mounting hole
WARNING
Never grab the tweeter section as a hand hold.
The speaker could fall due to damage, resulting
in possible personal injury.
Tweeter section
Tweeter section
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6-2. Rotate and tighten the mounting tab axis screws (4 places) on the unit clockwise to their full stop in
order to grip the ceiling panel with the mounting tabs.
Mounting tab
Mounting tab axis screw
Use an electric screwdriver to tighten.
(Tightening torque: 6 – 10 kgf·cm)
Step 7. Set the input power.
Turn the input selector switch (on the unit's front) to set
it to the desired input impedance.
(Factory-preset to 170 Ω.)
Important
Never set this switch to low-impedance (8 Ω or 16 Ω)
settings when using a high-impedance 25, 70, or 100 V
line. Failure to follow this instruction could result in
damage to the speaker or amplifier.
Step 8. Attach the front grille.
Align the tabs (4 places) on the back side of the
Speaker
unit
grille with the corresponding notches in the unit,
then rotate the grille to full stop in the direction
indicated by the "LOCK" arrow.
Tip
The front grille employs a double-locking system
that clicks into place once partway through
rotation, but only locks into position at its point of
full rotation. Always be sure to rotate the grille to
its full stop.
Notch
(4 places)
LOCK
Front grille (accessory)
Tab (4 places)
8
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6. REMOVING THE SPEAKER FOR MAINTENANCE
6.1. Detaching the Front Grille
1
Unlock
Turn the front grille counterclockwise to full stop, then lightly
pull it downward.
Tip
The front grille employs a double-locking system.
If the grille cannot be detached when lightly pulled downward,
it likely has not yet been fully rotated back to the detachment
position. In such cases, take care to rotate the grill fully
counterclockwise in order to release the lock.
Front grille
Pull lightly.
2
6.2. Removing the Speaker
Rotate the 4 mounting tab axis screws counterclockwise. The mounting tabs rise as they turn, allowing the
speaker to be removed.
Caution
When loosening the mounting tab axis screws, support the speaker by hand to prevent it from falling.
Screw cap
Mounting tab
Mounting tab axis screw
Use an electric screwdriver to detach.
Caution
Be sure to set the screwdriver's torque for under 4 kgf·cm.
Failure to do so may cause the Screw cap and the Mounting tab to fall off
on the rear of ceiling panel.
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7. REPAINTING THE SPEAKER
Follow the procedure below when repainting the front grille:
Step 1. Clean the front grille before painting.
Wipe with a soft cloth dampened in a detergent.
Caution
Do not use thinner or other volatile liquids to clean the grille.
Step 2. Spray on a uniform, thin coat of paint.
Cautions
• Avoid painting with a roller or brush, as the grille mesh holes could become clogged with paint.
• Use appropriate spray paints for the front grille (grille and frame) materials.
Grille: Rolled steel plate
Frame: Fire-resistant ABS resin (acrylic paint)
• Be sure to follow the directions indicated on the paint when painting.
Step 3. After the paint has dried, apply another light coat.
Caution
Repeating Step 2, apply two or more light coats of paint.
Application of one thick coat of paint all at once may cause drips or unevenness to show up in the
painted finish, or clog the mesh holes.
8. ABOUT THE INPUT OVERLOAD PROTECTION CIRCUITRY
The F-2852C features internal input overload protection circuitry. If an extremely high input level is fed to the
unit, the protection circuitry automatically cuts off the signal to the speaker element.
A drastic reduction in sound volume indicates that the protection circuitry has been enabled.
In such cases, simply reduce the amplifier volume. The protection circuitry will automatically reset in
approximately 10 seconds. After reset, try to maintain the volume at a level slightly lower than before.
Caution
This protection circuitry does not completely protect the unit against extremely high input power levels.
Depending on the type or duration of excessive power input, the protection circuitry might not be enabled,
resulting in damage to the speaker element. Also, if the excessive power input continues for a long period of
time, the circuitry may not be capable of resetting to its original condition.
Use the system with care so that the speakers are not exposed to excessive power input.
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9. SPECIFICATIONS
Enclosure
Bass reflex type
Rated Input
60 W (High Impedance)
Power Handling Capacity
Continuous pink noise: 90 W (8 Ω), 60 W (16 Ω),
Continuous program: 180 W (8 Ω), 120 W (16 Ω)
100 V line: 170 Ω (60 W), 330 Ω (30 W), 670 Ω (15 W), 3.3 kΩ (3 W)
70 V line: 83 Ω (60 W), 170 Ω (30 W), 330 Ω (15 W), 670 Ω (7.5 W), 3.3 kΩ (1.5 W)
25 V line: 83 Ω (7.5 W), 170 Ω (3.7 W), 330 Ω (1.9 W), 670 Ω (0.9 W), 3.3 kΩ (0.2 W)
16 Ω, 8 Ω
Impedance
Sound Pressure Level
Frequency Response
91 dB (1 W, 1 m)
60 – 20,000 Hz (–10 dB), 45 – 20,000 Hz (–20 dB)
at installation in 1/2 free sound field
(Measured by installing the unit in the center of a ceiling.)
High frequency: Dome-type, Low frequency: 16 cm (6 1/2") cone-type
ø250 mm (9 27/32")
Speaker Component
Mounting Hole
Maximum ceiling thickness: 37 mm (1 29/64")
Removable locking connector with screw-down terminals
(2 input terminals and 2 bridge terminals)
Input Terminal
Usable Cable
Finish
Solid copper wire:
ø0.5 – ø1.6 mm (equivalent to AWG 24 – 14)
Stranded copper wire: 0.2 – 2.5 mm2 (equivalent AWG 24 – 14)
Enclosure:
Baffle:
Steel plate, plating
Fire-resistant ABS resin (resin material grade: UL-94 V-0 or
its equivalent), black
Rim:
Fire-resistant ABS resin (resin material grade: UL-94 V-0 or
its equivalent), white, paint
Punched net: Steel plate, white, paint
ø280 mm (11 1/32") x Depth 227 mm (8 15/16")
5.1 kg (including mounting accessories)
Dimensions
Weight
Note: The design and specifications are subject to change without notice for improvement.
• Accessories
Front grille ............................................................ 1
Ceiling reinforcement ring .................................... 1
Safety wire (approx. 60 cm or 23 5/8") .................. 1
Paper pattern ....................................................... 1
• Optional Components
HY-TB1 (Tile Bar Bridge):
Place this bridge on the ceiling frame when mounting the speaker unit to
a weak suspended ceiling.
HY-AH1 (Anchor Hanging Bracket): Attach this bracket to an anchor bolt when mounting the speaker unit to a
weak ceiling.
11
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Printed in Indonesia
533-06-096-80
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