LB20-PC90-8D - Loudspeaker BOSCH - Free user manual and instructions

Product Type	Loudspeaker
Model	LB20-PC90-8D
Brand	Bosch
Dimensions (H x W x D)	400 mm x 250 mm x 230 mm
Weight	6.5 kg
Frequency Response	60 Hz - 20 kHz
Power Handling (RMS)	90 W
Impedance	8 ohms
Sensitivity	90 dB SPL (1W/1m)
Drivers	8" woofer, 1" tweeter
Enclosure Type	Bass-reflex (ported)
Connectors	Screw terminal block
Mounting	Wall-mountable with bracket (included)
Color	Black or white
Material	ABS plastic, steel grille
Operating Temperature	-25°C to +55°C
Protection	Overload protection, IP54 rating
Applications	PA systems, background music, announcements
Cleaning	Wipe with damp cloth; do not use solvents
Safety	Compliant with IEC 60065, CE marked
Spare Parts	Contact Bosch service for grille, driver, crossover

Frequently Asked Questions - LB20-PC90-8D BOSCH

How do I connect the LB20-PC90-8D to an amplifier?

Use the screw terminal block on the back. Connect the amplifier output to the speaker terminals, ensuring correct polarity (positive to positive, negative to negative). The speaker is rated at 8 ohms, so ensure your amplifier can drive this load.

What is the recommended mounting height?

For optimal sound distribution, mount the speaker at least 2.5 meters above the floor. Use the included wall bracket and ensure it is securely fastened to a solid wall.

Can this speaker be used outdoors?

Yes, the speaker has an IP54 rating, making it splash-proof and dust-resistant. However, avoid direct exposure to rain or extreme weather; use a protective cover if necessary.

What is the power handling capacity?

The LB20-PC90-8D handles 90W RMS (continuous) and 180W peak. Use an amplifier with power output between 50W and 180W per channel at 8 ohms for best performance.

How do I clean the speaker?

Wipe the enclosure and grille with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners. For the grille, you can remove it and gently vacuum dust.

Does the speaker require any maintenance?

Periodically check the connections and mounting hardware for security. Examine the grille for dust accumulation. No internal maintenance is required unless damage occurs.

What type of amplifier is recommended?

Use a professional PA amplifier with 8-ohm output, capable of delivering 50-180W per channel. Bosch recommends amplifiers with built-in limiters to protect the speaker from overload.

Can I use this speaker for live music?

Yes, it is suitable for speech and background music. For high-volume live music, consider using a subwoofer to extend low-frequency response.

How do I replace a damaged driver?

Contact Bosch service for genuine replacement parts. To replace, remove the grille and unscrew the driver. Disconnect the wires, install the new driver, and reassemble. Ensure correct polarity.

Is the speaker compatible with 70V/100V systems?

No, this is a low-impedance (8-ohm) speaker. It is not designed for constant-voltage distribution systems. Use a standard amplifier.

USER MANUAL LB20-PC90-8D BOSCH

Installation as easy as 1-2-3

Premium commercial loudspeakers with easy wall mount system for indoor and outdoor applications

▶ Designed with the contractor in mind, with unique time-saving and performance-enhancing features to simplify installation.
▶ Superior Bosch quality with controlled sound coverage for keeping background music focused and paging intelligible.
- Handles higher SPLs for use in bars, clubs and restaurants.

The LB20 series is the latest member of the Bosch family of commercial loudspeakers for indoor and outdoor applications. Acoustically matched and aesthetically compatible with other Bosch models, the LB20 series incorporates innovative features that efficiently and effectively address the real-world needs of both the installer and the end-user

- easy installation and exceptional Bosch audio performance in an incredibly versatile format.

The LB20 series was designed from the ground up to be the new go-to choice for distributed sound systems – compact and cost-effective with no compromises.

Models

The lineup includes 4-inch, 5.25-inch and 8-inch 2-way models with a matching dual-10-inch subwoofer, making it easy to select a suitable model for a specific space, indoors or outdoors. Each member of the series offers true weather-resistant construction, confirmed by extensive and rigorous testing above and beyond industry norms.

Applications

Combining low-profile looks with robust, set-it-and-forget-it reliability, they are ideal for bars, restaurants, patio areas, retail spaces, hotel hallways and lobbies, pool areas, airport lounges and concourses, fitness clubs, houses of worship, performing arts centers and similar venues.

Key Features:

▶ Innovative wall-mount system makes installation quick and easy.
▶ All models are IP54 certified for weather resistance; IP65-certified weatherproof versions are available for the 5.25-inch models and the dual-10-inch subwoofers.
▶ Low-Z (8 ohms) and transformer (70/100V) models available for maximum flexibility.
▶ Aesthetically pleasing: all wiring to the loudspeaker can be hidden; all models are paintable and feature removable grilles. Rotatable logos help maintain correct appearance for horizontal positioning.

Installation as easy as 1-2-3

1. PRE-WIRE

Installing the wall-mount is easy thanks to the built-in bubble level

2. PROTECT

Apply the paint cover to protect the wall-mount until construction is completed

3. PLACE

Simply slide the pre-wired loudspeaker onto the wall-mount and lock into place

Specifications

	LB20-PC40-4 / LB20-PC15-4	LB20-PC75-5 / LB20-PC30-5	LB20-PC60EW-5 LB20-PC90-8 / LB20-PC60-8		LB20-SW400
Frequency Response (-10 dB)	75 Hz - 20kHz1	60 Hz - 20kHz1	55 Hz - 20kHz1	50 Hz - 20kHz133 Hz - 500 Hz	1
Sensitivity	87 dB2/86.5 dB2	90 dB289 dB290 dB		2	94 dB4
Max SPL	103 dB / 98.5 dB 109 dB	108 dB 110 dB 120 dB
Coverage Angle (H x V)	Horizontal 110 ° Vertical 110 °	Horizontal 90 ° Vertical 90 °	Horizontal 90 ° Vertical 90 °	Horizontal 90 ° Vertical 90 °	-
Power Handling	40 W / 15 W 75 W / 30 W 90 W 90 W / 60 W 400 W
Low Z	Yes / No Yes Yes Yes Yes
Nominal Impedance	8Ω / - 8Ω 8Ω 8Ω 8Ω
Input Transformer (70 V / 100 V)	- / 15 W - / 30 W 60 W	- / 60 W Optional Accessory
Transformer Taps	70V: 15 W, 7.5 W, 3.5 W 100V: 15 W, 7.5 W	70V: 30 W, 15 W, 7.5 W, 3.5 W, 8Ω 100V: 30 W, 15 W, 7.5 W, 8Ω	70 V: 60 W, 30 W, 15 W, 7.5 W, 8Ω 100 V: 60 W, 30 W, 15 W, 8Ω	70 V: 60 W, 30 W, 15 W, 7.5 W, 8Ω 100 V: 60 W, 30 W, 15 W, 8Ω	Optional Accessory
LF Transducer	4 in (102 mm)	5.25 in (133 mm)	5.25 in (133 mm)	8 in (203 mm)	Two 10 in (254 mm)
HF Transducer	0.75 in (20 mm)	0.75 in (20 mm)	0.75 in (20 mm)	1 in (25 mm)	-
Connectors	Captive screws on wall bracket. Removable locking 4-pin connector (Euroblock) Max. wire size 12AWG (2.5 mm) 5	Captive screws on wall bracket. Removable locking 4-pin connector (Euroblock) Max. wire size 12AWG (2.5 mm)	Removable locking 4-pin connector (Euroblock) Max. wire size 12AWG (2.5 mm)	Captive screws on wall bracket. Removable locking 4-pin connector (Euroblock) Max. wire size 12AWG (2.5 mm)	Two removable locking 4-pin connector (Euroblock) - Input and output Max. wire size 12AWG (2.5 mm)
Environmental	IP-54 (per IEC-60529)	IP-54 (per IEC-60529)	IP-65 (per IEC-60529)	IP-54 (per IEC-60529)	IP-54 (per IEC-60529) IP-65 with port covers (included)
Color	Black (RAL 9004) or White (RAL 9003)
Dimensions (H x W x D)	193 × 140 × 120 mm (7.6 x 5.5 x 4.7 in) 3	255 × 180 × 154 mm (10.0 x 7.1 x 6.0 in) 3	255 × 180 × 150 mm (10 x 7.1 x 5.9 in) 3	390 × 250 × 224 mm (15.4 x 9.8 x 8.8 in) 3	356 × 651 × 491 mm (14 x 25.6 x 19.3 in) 3
Net Weight	1.5Kg( 3.3lb) 3/ 1.8Kg( 4.0lb) 3	2.7Kg( 5.9lb) 3/ 3.2Kg( 7lb) 3	3.2Kg( 7.1lb) 3	5.1Kg( 11.3lb) 3/ 5.8Kg( 12.8lb) 3	17.9Kg( 39.5lb) 3
Shipping Weight (pair)	5.0 Kg (11.0 lb) / 5.4 Kg (11.9 lb)	6.7 Kg (14.8 lb) / 7.9 Kg (17.5 lb)	9.5 Kg (21 lb)	13.0 Kg (28.7 lb) / 14.8 Kg (32.6 lb)	21.0 Kg (46.3 lb)
Included Hardware	Mounting Bracket, Allen Wrench	Mounting Bracket, Allen Wrench	U-Bracket, Allen Wrench, Input Cover	Mounting Bracket, Allen Wrench	(2) Subwoofer feet, weather input cover, (2) IP-65 port covers
Packaged Quantity	2	2	2	2	1

1 Half Space (wall mounting)
2 Half Space (on wall) averaged 100 Hz – 10 kHz, 1 W
3 Without Bracket
4 Half space (on wall) averaged 50 Hz - 150 Hz, 1 W
5 Removable locking 4-pin connector (Euroblock) not available on the LB20-PC15-4

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