BOSCH LBB1938/30
480 W power amplifier in a 3U high 19”case for rack mounting or tabletop use.
Cek Harga
Description
The Bosch LBB1938/30 is a powerful 480 W power amplifier in a 3U high 19”case for rack mounting or tabletop use.
LEDs on the front panel of the LBB1938/20 show the status of the amplifier: power, audio output level, and supervised functions.
This high performance unit fulfils a wide range of public address requirements at a surprisingly low cost.
Rack mounting brackets supplied.
- 480 watts
- Protected against overload and short circuits
- Temperature-controlled fan for high reliability at high output levels & low acoustic noise at lower output levels
- Overheat protection circuit with LED warning on the front panel
- Operates on mains power or 24 V battery for emergency backup, with automatic switchover
- Monitored mains presence, battery presence, pilot-tone presence, amplifier operation for Emergency / EVAC use
- Front panel status LEDs for supervised functions
- Two balanced inputs with priority control, each with loop‑through
- Additional 100 V line input
- Rear mounted gain / level controls
- 70V / 100V/ 8 ohm outputs
- Two separate priority controlled 100 V outputs for zones that only need announcements made via the priority input, and for zones that will not get any announcements made via the priority input.
Specification
Voltage | 220/230 VAC, ±10%, 50/60 Hz |
Inrush current | 19 A |
Max power consumption | 2200 VA |
Voltage | 24 VDC +15% / -15% |
Current max | 30 A |
Output power (rms/maximum) | 480 W / 720 W |
Power reduction on backup power | -1 dB |
Frequency response | 50 Hz to 20 kHz (+1/‑3 dB @ ‑10 dB ref. rated output) |
Distortion | <1% @ rated output power, 1 kHz |
S/N (flat at max volume) | >90 dB |
Line inputs | 2 x |
Connector | 3‑pin XLR, balanced |
Sensitivity | 1 V |
Impedance | 20 kOhm |
CMRR | >25 dB (50 Hz to 20 kHz) |
Gain | 40 dB |
Connector | Screw, unbalanced |
Sensitivity | 100 V |
Impedance | 330 kOhm |
Line loop-through output | 2 x |
Connector | 3‑pin XLR |
Nominal level | 1 V |
Impedance | Direct connection to line input |
Loudspeaker outputs | 3 x |
Connector | Screw, floating |
Direct output | 100 V, 70 V, 8 Ohm |
Priority only (from input 1) | 100 V or 70 V internally selectable |
Music (non-priority) only | 100 V or 70 V internally selectable |
Power consumption | |
Mains operation | |
Max power | 990 W |
-3 dB | 715 W |
-6 dB | 510 W |
Pilot tone* | 110 W |
Idle | 25 W |
24 VDC operation | |
Max power | 32 A (770 W) |
-3 dB | 26 A (625 W) |
-6 dB | 18 A (430 W) |
Pilot tone* | 3.8 A (91 W) |
Idle | 0.7 A (17 W) |
* 20 kHz -20 dB with maximum loudspeaker load | |
Mechanical | |
Dimensions (H x W x D) | 145 x 430 x 370 mm (19″ wide, 3U high, with feet) |
Weight Approx. | 25 kg |
Mounting | Standalone, 19”rack |
Color | Charcoal |
Environmental | |
Operating temperature | -10 ºC to +55 ºC (14 ºF to +131 ºF) |
Storage and transport temperature |
-40 ºC to +70 ºC (-40 ºF to +158 ºF) |
Relative humidity | <95% |
Acoustic noise level of fan | <48 dB SPL @ 1 m (max output) |