Product Description
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Six-zone system pre-amplifier,with single or dual channel operation
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Two input channels for call stations
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Universal input for microphone/line,with speech optimized tone control
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Three inputs for BGM selection and music optimized tone control
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Front panel zone selection for BGM and call station zone selection for calls
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The Plena system pre-amplifier is a versatile,high-performance unit with call and mono BGM (background music)
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It fulfills a wide variety of public address requirements at a surprisingly low cost
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It can provide dual channel operation for simultaneous calls and BGM for up to six different zones,using two Plena amplifiers
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Functions
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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
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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
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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
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The call channel is available on the balanced XLR master output
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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
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The BGM channel has a direct output on balanced XLR for dual channel operation
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It can also feed the master output,with the lowest priority,for single channel operation
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Zone selector switches on the front panel control the BGM routing
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An overload protected 24 VDC output provides power for driving external relays,often making an external power supply unnecessary
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An emergency/telephone input with signal level detector (VOX) and volume preset has the highest priority to all zones
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Two trigger inputs (contact closure) activate alarm or time signals to pre-selected zones
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Many different chime tones are available
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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
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There are six levels of priority available for BGM,microphone,call stations, trigger inputs and emergency input
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A set of relays directs the amplifier output(s) to different loudspeaker groups (zone switching)
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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
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The all-call microphone input and emergency activation override the call station selection on the call channel
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Each zone has separate priority overrides with preset volume levels
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This assures an appropriate message volume,independent of any local volume settings,such as for BGM
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Both three-wire and four-wire override schemes are supported
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An override also activates a voltage-free contact (call-active) available for external control and monitoring
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The master output channel,or one of the input channels,can be monitored through the headphone connector and/or the LED VU-meter
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Controls And Indicators
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Front
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LED power meter
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Power on LED
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Call active LED
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Three knobs for mic/line volume, treble, and bass levels
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Three knobs for BGM volume, treble, and bass levels
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BGM source selection knob
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Six zone-selections keys
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Six zone status LEDs
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On/off switch
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Back
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EMG input volume control
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Mains voltage switch
Interconnections -
Front
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Headphone jack
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Back
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One (DIN or XLR) Mic/line input
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Two (DIN/DIN) call station inputs
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PC audio (cinch) input
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Priority input
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Master (XLR) output
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BGM (XLR) output
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Emergency signal input
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Two trigger inputs
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RS-232 (DE-9)
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Three (cinch) CD, tape, aux inputs
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Six 100 V speaker outputs
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24 VDC output
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24 VDC input
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Three control inputs
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Ground screw
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IEC mains socket
Product Specification
