- 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
- PC and trigger inputs for automated calls, alarm tones and chimes to selected zones.
The call channel provides two inputs for the Plena call stations, LBB 1941/00 (all-call) or LBB 1946/00 (six- zone), 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. Two trigger inputs (contact closure) activate alarm or time signals to pre-selected zones. Many different chime tones are available. A PC audio input with RS-232 control provides software controlled zone configuration, or automatic messaging in combination with the LBB 1965/00 Plena Message Manager. There are six levels of priority available for BGM, microphone, call stations, trigger inputs and emergency input. A set of relays directs the amplifier output(s) to different loudspeaker groups (zone switching)
Electrical
Mains Voltage 230 VAC / 115VAC, ±15%,
50 / 60 Hz
Max Mains Power Consumption 25 VA
Battery Voltage 24 VDC, +20%/-10%
Max Battery Current 1A
Max Mains Inrush Current 1.5 A @ 230 Vac / 3 A @ 115 VAC
Performance
Frequency Response 50 Hz – 20 kHZ (+1/-3dB)
Distortion <0.5%
Bass Control ±10 dB @ 100 Hz
Treble Control ±10 dB @ 10 kHz
Channel Separation >70 dB @ 1 kHz
Priority Mute >40 dB
Inputs
Mic in
Sensitivity 1 mV (microphone), 200 mV
(line)
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, in mic. mode
only
3 Cinch inputs (unbalanced, stereo converted to mono)
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
Outputs
Master Out (3-pin XLR, balanced)
Nominal Level 1 V
Impedance <100 ohm
Music Output (3-pin XLR, balanced)
Nominal Level 1 V
Impedance <100 ohm
Tape Output (Cinch, 2 x mono)
Nominal Level 350 mV
Impedance <1 kOhm
Headphone output (6.3mm jack stereo, signal mono)
Nominal Level 3 V
Impedance <100 ohm
Zone Relays 250 V / 5 ALBB 1925/10 Plena System Pr
