ราคาพิเศษ สอบถามโทร 080-6144774 , 02-9810944
BOSCH LBB4428/00
Features
1, 2, 4, or 8 audio outputs (selection from 100 / 70 / 50 V outputs)
Audio processing and delay for each amplifier channel
Amplifier supervision and spare amplifier switching
Loudspeaker line and loudspeaker supervision (LBB 4428/00 only line supervision)
Eight control inputs and 1, 2, 4 or 8 control outputs
Supervision of line attached to control inputs
Automatic volume control
Two audio inputs (four audio inputs for LBB 4428/00)
Redundant network connection
Specifications
Mains power supply
Voltage
PRS‑xPxxx 115 / 230 VAC ±10%, 50/60 Hz
LBB 4428/00 100 to 240 VAC ±10%, 50/60 Hz
Power consumption Pmax -3 dB* / idle** / standby
PRS‑1P500 350 / 50 / 20 W
PRS‑2P250 350 / 53 / 21 W
PRS‑4P125 350 / 66 / 23 W
LBB 4428/00 430 / 90 / 32 W
* Alarm tone level** With pilot tone 15 V
Battery power supply
Voltage 48 VDC -10% to +20%
Power consumption Pmax -3 dB* / idle** / standby
PRS‑1P500 330 / 40 / 10 W
PRS‑2P250 330 / 43 / 11 W
PRS‑4P125 330 / 56 / 13 W
LBB 4428/00 400 / 65 / 22 W
* Alarm tone level** With pilot tone 15 V
Mic/line inputs 2 x (4 x for LBB 4428/00)
Connector 6-pole header for removable screw connector (mono, balanced)
Line
Frequency response -3 dB @ 50 Hz and 20 kHz (±1 dB)
S/N >87 dBA
CMRR >40 dB @ 1 kHz
Input range -6 dBV to 6 dBV
Input impedance 22 kohm
Mic
Frequency response -3 dB @ 100 Hz and 16 kHz
Nominal input level -57 dBV
S/N >62 dBA with 25 dB headroom
CMRR 40 dB at 1 kHz
Input impedance 1360 ohm
Phantom supply 12 V ±1 V @ 15 mA
Input range -7 dBV to +8 dBV ref nominal input value
Control inputs 8 x
Connectors Removable screw terminals
Operation Closing contact (with supervision)
Control outputs 1 x per amplifier channel
Connectors Removable screw terminals
Performance
Frequency response
PRS‑xPxxx 60 Hz to 19 kHz (-3 dB)
LBB 4428/00 80 Hz to 19 kHz (-3 dB)
S/N >85 dB (no pilot tone)
Crosstalk <80 dB at nominal load for 1 kHz
Distortion <0.3% (@ 1 kHz) @ 50% of rated output power
Loudspeaker outputs PRS‑1P500
Rated load resistance 20 ohm (100 V); 10 ohm (70 V) 5 ohm (50 V)
Rated load capacitance 250 nF (100 V); 500 nF (70 V) 1000 nF (50 V)
Rated output power(per channel) 500 W (1 min. at 55 °C)
250 W (30 min. at 55 °C, cont. at 30 °C)
125 W (cont. at 55 °C)
Connector 9‑pole header for removable screw connector
Loudspeaker outputs PRS‑2P250
Rated load resistance 40 ohm (100 V); 20 ohm (70 V) 10 ohm (50 V)
Rated load capacitance 125 nF (100 V); 250 nF (70 V) ) 500 nF (50 V)
Rated output power(per channel) 250 W (1 min. at 55 °C)
125 W (30 min. at 55 °C, cont. at 30 °C)
60 W (cont. at 55 °C)
Connector 9‑pole header for removable screw connector
Loudspeaker outputs PRS‑4P125
Rated load resistance 80 ohm (100 V); 40 ohm (70 V) 20 ohm (50 V)
Rated load capacitance 62 nF (100 V); 125 nF (70 V) ) 250 nF (50 V)
Rated output power(per channel) 125 W (1 min. at 55 °C)
60 W (30 min. at 55 °C, cont. at 30 °C)
30 W (cont. at 55 °C)
Connector 9‑pole header for removable screw connector
Loudspeaker outputs LBB 4428/00
Rated load resistance 166 ohm (100 V); 83 ohm (70 V) 42 ohm (50 V)
Rated load capacitance 30 nF (100 V); 60 nF (70 V) ) 120 nF (50 V)
Rated output power(per channel) 60 W (1 min. at 55 °C)
30 W (30 min. at 55 °C, cont. at 30 °C)
15 W (cont. at 55 °C)
Connector 9‑pole header for removable screw connector
Dimensions (H x W x D)
for tabletop use, with feet 92 x 440 x 400 mm(3.6 x 17.3 x 15.7 in)
for 19” rack use, with brackets 88 x 483 x 400 mm(3.5 x 19 x 15.7 in)
in front of brackets 40 mm (1.6 in)
behind brackets 360 mm (14.2 in)
Weight
PRS‑1P500 12.6 kg (27.78 lb)
PRS‑2P250 13.6 kg (29.98 lb)
PRS‑4P125 16.1 kg (35.49 lb)
LBB 4428/00 15.8 kg (34.83 lb)
Mounting Standalone; 19”-rack
Color Charcoal with silver
Operating temperature -5 ºC to +55 ºC (+23 ºF to +131 ºF)
Storage temperature -20 ºC to +70 ºC (-4 ºF to +158 ºF)
Relative humidity 15% to 90%
Air pressure 600 to 1100 h Pa
