Key Features:

• Six-zone system pre-amplifier: Supports single or dual-channel operation.
• Versatile inputs: Two call station inputs, a universal microphone/line input with tone control, and three inputs for BGM selection.
• User-friendly controls: Front panel zone selection for BGM and call routing.
• Emergency-ready: Includes emergency/telephone input with signal detection and priority override.
• Advanced zone management: Tri-state zone controls for call, BGM, or off states.

Description:
The LBB 1925/10 PLENA System Pre-Amplifier is a high-performance, cost-effective solution for public address and background music (BGM) systems. It supports dual-channel operation, enabling simultaneous calls and BGM across up to six zones. With integrated controls, tone optimization, and multiple priority levels, it meets the needs of diverse public address applications.

Applications:
Ideal for schools, office buildings, retail stores, hospitality venues, conference centers, and other facilities requiring flexible zone-based audio distribution and emergency support.

Advanced Functions:

• Call Channel Features:

  • Two Plena call station inputs (all-call or six-zone).
  • Universal mic/line input with selectable speech filter, volume control, and tone adjustment.
  • All-call priority contact for chime signals.

• BGM Channel Features:

  • Three stereo inputs for music sources, converted to mono.
  • Independent volume, bass, and treble controls optimized for music.
  • Direct and master output options for single or dual-channel operation.

• Priority and Overrides:

  • Emergency/telephone input with the highest system priority.
  • Trigger inputs for alarm signals and chimes.
  • Six levels of priority across inputs, emergency signals, and zone management.
  • Override relays for priority messages and voltage-free contacts for external control.

• Zone Controls:

  • Tri-state zone selection (off, call, BGM) with status LEDs.
  • Separate volume presets for call and BGM channels in each zone.
  • Multi-wire override support for flexible system configurations.

• Monitoring and Configuration:

  • RS-232 control for zone setup and messaging integration with the Plena Message Manager.
  • Headphone monitoring and LED VU meter for master or input channels.

Certifications and Approvals:

• Safety: EN 60065
• EMC Emission: EN 55103‑1
• EMC Immunity: EN 55103‑2
• Certification: CE (Europe)

Technical Specifications:

• Power Supply:

  • Mains voltage: 230/115 VAC ±15%, 50/60 Hz.
  • Battery power: 24 VDC, +10%/-15%.
  • Power consumption: 25 VA max.

• Audio Performance:

  • Frequency response: 50 Hz to 20 kHz (+1/-3 dB).
  • Bass/Treble control: ±10 dB at 100 Hz and 10 kHz.
  • Dynamic range: 100 dB.

• Inputs/Outputs:

  • Mic/line input: 1 (XLR or DIN, balanced with phantom power).
  • Music inputs: 3 (stereo RCA, unbalanced).
  • Zone outputs: 6 (100 V speaker outputs).
  • Additional outputs: Master output (XLR), BGM output (XLR), and tape output (RCA).

• Physical Dimensions:

  • Size: 100 x 430 x 270 mm (H x W x D).
  • Weight: Approx. 5 kg.
  • Mounting: Standalone or 19" rack.

Included Components:

• 1 LBB 1925/10 PLENA System Pre-Amplifier.
• Power cord.
• 19" mounting brackets.
• Plena CD.
• Installation and user instructions.