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System Pre Amplifier

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LBB 1925/10 Bosch Plena System Pre-Amplifier

LBB 1925/10 Bosch Plena System Pre-Amplifier
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Approx. Rs 28,497 / PieceGet Latest Price

Product Details:
Model NumberLBB 1925/10
Voltage230/115 VAC, +/-15%, 50/60 Hz
Current Inrush230/115 VAC, 1.5/3 A
Priority MuteMore than 40 dB
Dynamic Range100 dB
Connectors5-pin DIN, 3-pin XLR, balanced, with phantom power
Sensitivity1 mV (mic), 200 mV (line)
Dimensions100 x 430 x 270 mm(H x W x D) (19" wide, 2U high)
Weight Approx5 kg
MountingStandalone, 19" rack
Operating Temperature-10 deg C to +55 deg C (14 deg F to +131 deg F)
Storage Temperature-40 deg C to +70 deg C (-40 deg F to +158 deg F)
Max Power Consumption25 VA
Battery Voltage24 VDC, +10% / -15%
Current Max1 A
Frequency Response50 Hz to 20 kHz (+1 / -3 dB)
DistortionLess than 0.5%
Bass Control+/-10 dB @ 100 Hz
Treble Control+/-10 dB @ 10 kHz
Channel SeparationMore than 70 dB @ 1 kHz

The Plena system pre-amplifier is a versatile, highperformance unit with call and mono BGM (background music). It fulfills a wide variety of public address requirements at a surprisingly low cost. It can provide dual channel operation for simultaneous calls and BGM for up to six different zones, using two Plena amplifiers.

  • Six-zone system pre-amplifier, with single or dual channel operation
  • Two input channels for call stations
  • Universal input for microphone/line, with speech optimized tone control
  • Three inputs for BGM selection and music optimized tone control
  • Front panel zone selection for BGM and call station zone selection for calls

  • The call channel provides two inputs for the Plena call stations, LBB 1941/00 (all-call) or LBB 1946/00 (sixzone), with loop-through capability, and universal, balanced input. One is a 3-pin XLR connector for microphone or line level (selectable), and the other is a 5-pin DIN-connector with all¿¿¿call priority contact, which may also be used to start one of the available chime attention signals.
  • The microphone input has a selectable speech filter for improved intelligibility, a volume control, and bass and treble tone controls with shelving characteristics optimized for speech. The call channel is available on the balanced XLR master output.
  • The BGM channel provides three inputs on stereo cinch-connectors, converted to mono, with front panel selection, volume control and bass and treble tone controls with shelving characteristics optimized for music. The BGM channel has a direct output on balanced XLR for dual channel operation. It can also feed the master output, with the lowest priority, for single channel operation. Zone selector switches on the front panel control the BGM routing. An overload protected 24 VDC output provides power for driving external relays, often making an external power supply unnecessary.
  • An emergency/telephone input with signal level detector (VOX) and volume preset has the highest priority to all zones.

Certifications and approvals:
  • Safety: acc. to EN 60065
  • Immunity: acc. to EN 55103-2
  • Emission: acc. to EN 55103-1

  • 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 1.2 kohm, (mic mode only)
  • Line input: 3 x
  • Connector: Cinch, stereo converted to mono, unbalanced
  • Sensitivity: 200 mV
  • Impedance: 22 kohm
  • S/N (flat at max volume): >70 dB
  • S/N (flat at min volume/muted): >75 dB
  • Headroom: >25 dB
  • Master output: 1 x
  • Connector: 3-pin XLR, balanced
  • Nominal level: 1 V
  • Impedance: <100 ohm
  • Tape output: 1 x
  • Connector: Cinch, 2 x mono
  • Nominal level: 350 mV
  • Impedance: <1 kohm
  • Headphone output: 1 x
  • Connector: 6.3 mm jack stereo, signal mono
  • Nominal level: 3 V
  • Impedance: <100 ohm
  • Zone relays: 5 A
  • Contacts voltage: 250 V
  • Contacts current: 8 A
  • Interconnection input /emergency: 1 x
  • Connector 3-pin XLR, balanced
  • Sensitivity: 200 mV (interconnection),100 mV to 1 V adjustable(emergency)
  • Impedance: >10 kohm
  • VOX threshold: 45 mV (emergency)
  • Interconnection output: 1 x
  • Connector: 3-pin XLR, balanced
  • Nominal level: 200 mV
  • Impedance: <100 ohm
  • Relay contacts: 30 V, 1 A
  • DC supply output voltage: 24 V, 250 mA max

Additional Information:
  • Item Code: LBB1925-10
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