Bosch 3.5 Manuel D’Utilisation

Bosch Security Systems | 2011-02

Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers

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12.6 Technical 

data 

loudspeaker 

supervision board

Dimensions (H x W x D):

78 x 60 x 22 mm

Weight:

70 g

Connection:

Screwable connector

Temperature:

-5 to 55 °C (operating, guaranteed)

-15 to 55 °C (operating, sample tested)

-20 to 70 °C (non-operating)

Relative humidity:

15 to 90%, non-condensing (operating)

5 to 95%, non-condensing (non-operating)

Air pressure:

600 to 1100 hPa

Electromagnetic compatibility:

EN55103-1/FCC-47 part 15B

EN55103-2

EN50121-4

EN50130-4

Electrical safety:

IEC60065 (CB-scheme)

EN60065

Approvals:

CE marking

EN60849, EN54-16 and ISO7240-16

IEC60945

MTBF:

50,000 hours at +55 °C

(The MTBF doubles for every 10 °C decrease in 

temperature.)

Preferred cable:

Single twisted pair, 0.75 mm

2

 to 1.5 mm

2

. The use of 

multiwire cables is not recommended. Cross talk of 

communication signals affects the supervision 

performance.

Maximum cable length: 

1 km (max. 300 m adjacent to other supervised 

loudspeaker cables)

Maximum cable loop resistance:

38 ohm

Maximum cable inductance:

750 μH

Minimum total loudspeaker impedance:

50 ohm @ 70 kHz (independent of amplifier power)

Maximum cable capacity:

300 nF. However, if the maximum load capacity for the 

power amplifier output is less than this value, the 

maximum load capacity of the power amplifier is 

leading (see section 8.8).

Maximum number of supervision boards 

(LBB4441/00 and LBB4443/00) per amplifier 

channel:

80 for a 500 W amplifier channel

40 for a 250 W amplifier channel

20 for a 125 W amplifier channel

10 for a 60 W amplifier channel (PRS-8B060 only)

Loudspeaker voltage:

70 V, 100 V

Note
The load of the loudspeakers in relation to the 

line impedance should be such that the 20 kHz 

pilot tone level is not less than 9 Vrms at the 

position of the supervision boards.