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Bosch LB20-PC40-4D & LB20-PC40-4L

Pair of cabinet speakers with innovative wall mount system. Black or White. 4", 40 watts @ 8 ohms. Water resistant, rated IP54.
List price Ex. VAT: £236.74

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The Bosch LB20-PC40-4D and LB20-PC40-4L compact cabinet loudspeakers feature a 4” driver with 40 watt power output at 8 ohms.

Water resistant, rated IP54.

The innovative mounting bracket enables all wiring to completed and terminated at first fix. The speaker is then simply clicked into place with no further cables or connections required or visible.

Furthermore, the speaker can be mounted horizontally or vertically thanks to the rotatable badge.

The fire rated ABS plastic enclosure houses a long throw 4" (102 mm) woofer for extended LF performance down to 75 Hz and 0.75" HF transducer.

Supplied and priced per pair.

The Bosch LB20 series is a new range of commercial loudspeakers can be  used indoors or outdoors. Superior quality ensures higher SPLs and maximum intelligibility. They are available in a range of sizes and different power offerings all acoustically and aesthetically matched. Please see the related products tab for other Bosch LB20 series loudspeakers.

Additional Information

Frequency response (-3 dB):

100 Hz - 20 kHz1

Frequency response (-10 dB):

75 Hz - 20 kHz1


87 dB2

Max SPL (calculated):

103 dB (109 dB Peak)

Coverage angle:

Horizontal 110°, Vertical 110°

Power handling:

40 W (160 W Peak) Continuous Pink Noise (100 hours)

Low Z:


Nominal impedance:

8 Ω

Minimum impedance:

6 Ω

Recommended High-Pass:

70 Hz (24 dB/octave)

Input transformer (70V/100V):


LF transducer:

4 inch (102 mm)

HF transducer:

0.75 inch (20 mm)


Captive screws on wall bracket. Removable locking 4-pin connector (Euroblock) - (2) for connection to additional speakers in a distributed line. Max. wire size 12AWG (2.5 mm)


IP54 (per IEC-60529)


Black or White

Dimensions (H x W x D):

193 mm x 140 mm x 120 mm (7.6 in x 5.5 in x 4.7 in)

Net Weight:

1.5kg (3.3lb)

Included hardware:

Mounting bracket and 4-mm Allen wrench

View FileBosch LB20-PC40-4 Cabinet Loudspeaker Datasheet    Size: (721.41 KB)
View FileBosch LB20 Series General Commercial Brochure    Size: (1018.82 KB)
View FileBosch LB20 Series Installation Manual    Size: (1.96 MB)
Product video for Bosch LB20-PC40-4D & LB20-PC40-4L