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Communication Systems | LBC 34xx/12 Horn Loudspeakers
LBC 34xx/12 Horn Loudspeakers
Bosch high-efficiency horn loudspeakers provide excellent speech reproduction and sound distribution for a wide scope of outdoor applications. They are ideal for sports grounds, parks, exhibitions, factories and swimming pools.
Functions
All four models are for direct connection to a 100 V line output and are finished in light grey (RAL 7035). The horns are water and dust protected.
The horn loudspeakers include a 100 V transformer with taps on the primary winding to allow different power settings. Nominal full-power, half-power or quarterpower radiation (i.e. in 3 dB steps) can easily be selected by connecting the amplifier output to the appropriate tap. A two meter long four-core cable is fitted to the horns. Each core is a different color, and is connected to one of the primary taps on the transformer.
The horn loudspeakers are supplied complete with sturdy adjustable mounting brackets, allowing the sound beam to be accurately directed.
High efficiency drivers
Up to 45 W (max. power)
Wide opening angle
Excellent speech reproduction
Simple power setting
Waterand dust protected to IP 65
Versatile mounting bracket
Comply with international installation and safety regulations
System Overview
The LBC 3481/12 is a circular horn loudspeaker with 15 W (max power) which is made from ABS
The LBC 3491/12 is a rectangular model with 15 W (max power) and is made from ABS.
The 30 W (max power) LBC 3492/12 is a circular loudspeaker with a large horn measuring 354mm in diameter. It is made from a combination of aluminum with ABS for optimum strength and low weight. The edge of the horn is covered with a PVC profile for protection against impact damage.
The 45 W (max power) LBC 3493/12 is a circular loudspeaker with a large horn measuring 400mm in diameter. It is made from a combination of aluminum with ABS for optimum strength and low weight. The edge of the horn is covered with PVC for protection against impact damage.
Certifications and Approvals
All Bosch loudspeakers are designed to withstand operating at their rated power for 100 hours in accordance with IEC 268-5 Power Handling Capacity (PHC) standards. Bosch has also developed the Simulated Acoustical Feedback Exposure (SAFE) test to demonstrate that they can withstand two times their
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2 | LBC 34xx/12 Horn Loudspeakers
rated power for short durations. This ensures extra reliability under extreme conditions, leading to higher customer satisfaction, longer operating life, and much less chance of failure or performance deterioration.
Safety |
EN 60065 |
Self-Extinguishing |
according to UL94V0 |
Installation/Configuration Notes
LBC 3481/12
Dimensions (in mm/inch)
Polar diagram (measured with pink noise)
Octave band |
125 |
250 |
500 |
1k |
2k |
4k |
8k |
(Hz) |
|
|
|
|
|
|
|
SPL 1.1 |
- |
- |
94 |
103 |
105 |
98 |
86 |
SPL max. |
- |
- |
104 |
113 |
115 |
108 |
96 |
Q-factor |
- |
- |
1.7 |
3.5 |
7.8 |
25.7 |
52.5 |
Efficiency |
- |
- |
1.82 |
7.08 |
5.13 |
0.31 |
0.01 |
Hor. angle |
- |
- |
180 |
160 |
95 |
50 |
30 |
Vert. angle |
- |
- |
180 |
160 |
95 |
50 |
30 |
Quick reference table
Circuit diagram |
LBC 3491/12 |
Frequency response
Dimensions (in mm/inch)
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