Instruction/ maintenance manual of the product LBB 1925/10 Bosch Appliances
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Communications Systems | LBB 1925/10 Plena System Pre-Amplifier LBB 1925/10 Plena System Pre-Amplifier www.boschsecurity.com u Six-zone system pre-amplifier, with single or dual channel operation u Tw.
Each zone has a tri-state control on the front panel that can turn it off, switch it to the call channel, or to the BGM channel. The all‑call microphone input and emergency activation override the call station selection on the call channel. Each zone has separate priority overrides with preset volume levels.
Impedance >1 kohm (mic); >5 kohm (line) S/N (flat at max volume) >63 dB (mic); >70 dB (line) S/N (flat at min volme/muted) >75 dB CMRR >40 dB (50 Hz – 20 kHz) Headroom >25 dB Speech filter -3 dB @ 315 Hz, high-pass, 6 dB/oct Phantom power supply 16 V via 1.
4 | LBB 1925/10 Plena System Pre-Amplifier Represented by: Americas: Europe, Middle East, Africa: Asia-Pacific: China: America Latina: Bosch Security Systems, Inc. 12000 Portland Avenue South Burnsville MN 55337, USA Phone: +1-800-392-3497 Fax: +1-800-955-6831 audiosupport@us.
An important point after buying a device Bosch Appliances LBB 1925/10 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
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If you already are a holder of Bosch Appliances LBB 1925/10, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Bosch Appliances LBB 1925/10.
However, one of the most important roles played by the user manual is to help in solving problems with Bosch Appliances LBB 1925/10. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Bosch Appliances LBB 1925/10 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
