Bosch Premium Ceiling Speakers

1 Safety

Warning! Suspending any object is potentially dangerous and should only be attempted by individuals who have a thorough knowledge of the techniques and regulations of suspending objects overhead. Bosch strongly recommends all loudspeakers be suspended taking into account all current national, federal, state, and local laws and regulations. It is the responsibility of the installer to ensure all loudspeakers are safely installed in accordance with all such requirements. When loudspeakers are suspended, Bosch strongly recommends the system be inspected at least once per year or as laws and regulations require. If any sign of weakness or damage is detected, remedial action should be taken immediately. The user is responsible for making sure the wall, ceiling, or structure is capable of supporting all objects suspended overhead. Any hardware used to suspend a loudspeaker not associated with Bosch is the responsibility of others.

Caution! ⚠️ The seismic tab (auxiliary support ring) is not intended for primary suspension of the loudspeaker. The seismic tab should only be used as a secondary safety point.

2 Welcome

Thank you for purchasing Premium Ceiling Speakers. Read through this manual to familiarize yourself with the features, applications, and precautions before you use these products. Premium Ceiling Speakers use innovative design and materials to provide high performance in a flush-mount ceiling format. Two (2) models comprise the Premium Ceiling Speaker family: LC20-PC60G6-6 and LC20-PC60G6-8.

2.1 Important features

LC20-PC60G6-6 -- 6-inch Premium Ceiling Speaker

• High output true compression driver for wide dispersion and superior coverage control out to 10 kHz
• Long throw 6.5 inch (165 mm) woofer housed in a large vented steel enclosure for extended LF performance down to 50 Hz
• 200 watt power handling provides for 113 dB maximum SPL
• Front baffle transformer tap adjustment switch
• Includes tile rails and "C" mounting ring

LC20-PC60G6-8 -- 8-inch Premium Ceiling Speaker

• High output true compression driver for wide dispersion and superior coverage control out to 10 kHz
• Long throw 8-inch (200 mm) woofer housed in a large vented 14 gauge steel enclosure for extended LF performance down to 40 Hz
• 200 watt power handling provides for 114 dB maximum SPL
• Front baffle transformer tap adjustment switch
• Includes tile rails and "C" mounting ring

3 System overview

3.1 Packing list

The following components are included in the kit:

Figure 3.1: Illustration showing the components included in the speaker kit: Speaker system (x2), Tile rails (x4), C-ring support (x2), Grille (x2), Manual (x1), Support ring screws (x4), Terminal connector (x2), Cutout template (x1), Paint shield (x2), Ceramic blocks (x2).

3.2 Product feature identification

Figure 3.2: Diagram showing the bottom and top views of the ceiling speaker, highlighting key features like the woofer, compression driver, and tap selector switch.

3.3 Dimensions

LC20-PC60G6-6 Dimensions: Height x Diameter: 260 mm x 280 mm (10.4 in x 11.0 in). Cutout Size: 248 mm (9.76 in).

LC20-PC60G6-8 Dimensions: Height x Diameter: 324 mm x 327 mm (10.4 in x 11.0 in). Cutout Size: 294.3 mm (11.59 in).

Figure 3.3: Diagrams illustrating the dimensions for the LC20-PC60G6-6 (6-inch) and LC20-PC60G6-8 (8-inch) ceiling speakers, showing height, diameter, and cutout size.

3.4 Frequency response and impedance

Figure 3.4: Graphs displaying the frequency response curves, indicating the speaker's output level across different frequencies, and impedance curves, showing the electrical impedance at various frequencies for both the 6-inch and 8-inch models.

3.5 Beamwidth

Figure 3.5: Graphs illustrate the beamwidth, representing the angle over which the speaker maintains a consistent sound dispersion, for the 6-inch and 8-inch models.

3.6 Directivity

Figure 3.6: Graphs present the directivity index, a measure of how well the speaker focuses sound in a particular direction, for the 6-inch and 8-inch models.

3.7 Horizontal and vertical polar response

Figure 3.7: A series of polar plots display the speaker's sound pressure level at different angles and frequencies. For each model (LC20-PC60G6-6 and LC20-PC60G6-8), horizontal response is shown in black and vertical response in gray, across a range of frequencies from 400 Hz to 20 kHz.

4 Installation

Step 1: Trace the provided cutout template onto the ceiling material. (Figure 4.1)

Step 2: Cut the hole in the ceiling following the traced outline. (Figure 4.2)

Step 3: Attach the tile rails to the C-ring support. (Figure 4.3)

Step 4: Connect wiring to the speaker terminal, noting the ground point. (Figure 4.4)

Step 5: Route wiring through flexible conduit if necessary. (Figure 4.5)

Step 6: Route wiring through solid conduit if necessary. (Figure 4.6)

Step 7: Attach the auxiliary support line (seismic tab) to the speaker and a secure overhead point as a secondary safety measure. ⚠️ The seismic tab (auxiliary support ring) is not intended for primary suspension of the loudspeaker. The seismic tab should only be used as a secondary safety point. (Figure 4.7)

Step 8: Insert the installed speaker assembly into the prepared ceiling opening. (Figure 4.8)

Step 9: Tighten the mounting tabs to secure the speaker flush against the ceiling. (Figure 4.9)

Step 10: Locate the transformer tap selector switch on the speaker baffle. (Figure 4.10)

Step 11: Adjust the transformer tap selector to the desired power setting. (Figure 4.11)

Step 12: Insert the grille tether to prevent the grille from falling. (Figure 4.12)

Step 13: Attach the speaker grille to the front of the speaker. (Figure 4.13)

Step 14: The installation is now complete. (Figure 4.14)

Wiring with the ceramic block:

Figure 4.15: Wiring diagram showing connection to the ground point using a ceramic block.

Figure 4.16: Wiring diagram showing connection through flexible conduit using a ceramic block.

Figure 4.17: Wiring diagram showing connection through solid conduit using a ceramic block.