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Product Description
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 Plena system pre-amplifier is a versatile,high-performance 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
Functions
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)
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
This assures an appropriate message volume,independent of any local volume settings,such as for BGM
Both three-wire and four-wire override schemes are supported
An override also activates a voltage-free contact (call-active) available for external control and monitoring
The master output channel,or one of the input channels,can be monitored through the headphone connector and/or the LED VU-meter
Controls And Indicators
Front
LED power meter
Power on LED
Call active LED
Three knobs for mic/line volume, treble, and bass levels
Three knobs for BGM volume, treble, and bass levels
BGM source selection knob
Six zone-selections keys
Six zone status LEDs
On/off switch
Back
EMG input volume control
Mains voltage switch
Interconnections
Front
Headphone jack
Back
One (DIN or XLR) Mic/line input
Two (DIN/DIN) call station inputs
PC audio (cinch) input
Priority input
Master (XLR) output
BGM (XLR) output
Emergency signal input
Two trigger inputs
RS-232 (DE-9)
Three (cinch) CD, tape, aux inputs
Six 100 V speaker outputs
24 VDC output
24 VDC input
Three control inputs
Ground screw
IEC mains socket
Product Specification
|
Brand |
Bosch |
|
Product Type |
Amplifier |
|
Product Model |
LBB1925/10 |
|
Mains Power Supply |
|
|
Voltage |
230/115VAC, ±15%, 50/60 Hz |
|
Current Inrush |
230/115 VAC, 1.5/3 A |
|
Maximum Power Consumption |
25 VA |
|
Battery Power Supply |
|
|
Voltage |
24 VDC, +10% / -15% |
|
Current Maximum |
1 A |
|
Performance |
|
|
Frequency Response |
50 Hz to 20 kHz (+1 / -3 dB) |
|
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 |
|
Dynamic Range |
100 dB |
|
Mic/Line Input |
1 x |
|
Connectors |
5-pin DIN,3-pin XLR,balanced,with phantom power |
|
Sensitivity |
1 mV (mic), 200 mV (line) |
|
Impedance |
>1 kohm (mic); >5 kohm (line) |
|
S/N (Flat At Maximum Volume) |
>63 dB (mic); >70 dB (line) |
|
S/N (Flat At Minimum 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 Maximum volume) |
>70 dB |
|
S/N (Flat At Minimum 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 |
|
Environmental |
|
|
Operating Temperature |
-10 ºC to +55 ºC (14 ºF to +131 ºF) |
|
Storage Temperature |
-40 ºC to +70 ºC (-40 ºF to +158 ºF) |
|
Relative Humidity |
<95% |
|
Mechanical |
|
|
Mounting |
Standalone, 19" rack |
|
Color |
Charcoal |
|
Dimensions (H x W x D) |
100 x 430 x 270 mm |
|
Weight |
Approx. 5 kg |
|
Warranty |
As Per Manufacturer Terms and Condition |
Other Details
|
Dimension (MM) – H x W x D |
100 x 430 x 270 |
|
Unit of Measurement |
1 Piece |
|
Weight |
5 kg |
|
Generic Type |
Amplifiers |
|
Manufacturer Details |
Bosch Limited Post Box No: 3000,Hosur Road, Adugodi, Bangalore - 560030, India, Phone :18004258665 |
|
Packer Details |
Bosch Limited Post Box No: 3000,Hosur Road, Adugodi, Bangalore - 560030, India, Phone :18004258665 |
|
Country of Origin |
India |
