Description
BOSCH LBD1935/00 240W Plena Booster Amplifier
- Wide range of power amplifier from 120W, 240W and 480W
- Multiple outputs – 70 V / 100 V and 8/4 ohm
- Temperature controlled forced front to back ventilation, directly stackable
- Mains, battery back-up, and pilot tone supervision
BOSCH LBD1935/00 240W Plena Booster Amplifiers are powerful power amplifier in a 2U high 19”case (3U housing for LBD 1938) for rack mounting or tabletop use. The Bosch Plena power amplifier series with its varied amplification range fulfills a wide variety of public address requirements at a surprisingly low cost.
System overview
BOSCH LBD1935/00 240W Plena Booster Amplifier feature colorful LED bar on the front side to indicate the acoustic level of the signal in dB. LBD1935 amplifiers have 100V input for slave operation of the amplifier, XLR loop in and loop through facility for ease of installation and 100V output as well as 70V output for connecting to the loudspeakers with line matching transformers, 8ohm and 4ohm outputs for connecting to the Low impedance speakers. The output voltage can be selected between 100V and 70V internally. Additionally LBD1938/00 amplifier features a dual XLR inputs with priority switching. Gain or level control is located on the rear of the unit to avoid accidental setting change. The amplifier works on 24VDC power supply during emergency situations
Functions Dependability
The amplifier is protected against overload and short circuits. A temperature-controlled fan ensures high reliability at high output levels and low acoustic noise at lower output levels. An overheat protection circuit switches off the power stage, if the internal temperature reaches a critical limit due to poor ventilation or overload.
Input
The system has two balanced inputs with priority control, each with a loop-through facility. This makes it easy to connect remote systems that require priority control. An additional 100V line input is provided to connect the amplifier to a 100V loudspeaker line to provide more power to remote locations. Gain or level control is located on the rear of the unit to avoid accidental setting change. A meter with LED-bar shows the output level.
Output
The amplifier has 70V and 100V outputs for constant voltage loudspeaker systems, and a low impedance output for 8 ohm or 4 ohm loudspeaker loads.LBD1938 amplifier also has priority controlled 100V outputs which can be used to route audio coming into priority and program inputs to the loudspeaker. The LBD1938/00 amplifier has priority input and program input on the rear which can be used for routing important or emergency announcements when the amplifier is being used as a independent amplifier(ex: with local music source connected to program input). There are Priority input enable and Program input enable pins which are default off and default on respectively, when these enabled by a 24VDC signal then the respective inputs are activated. Whenever the priority enable input is supplied with continuous 24VDC signal, the program input is over-ridded by the priority input. Certifications and approval.
Technical specifications
Electrical
| LBD1935/00 | |
| Power supply | |
| Input Voltage | 230VAC ±10% at 50/60Hz or 24VDC |
| Inrush Current | 9A at 230 VAC, 11A at 24 VDC |
| Performance | |
| Rated Output (RMS) | 240W |
| Power reduction on backup power | -1 dB |
| Frequency response | 60 Hz to 18 kHz (+1 / -3 dB at-10 dB ref. rated output) |
| Distortion | <1% at rated output, 1 kHz |
| S/N (flat at max volume) | > 85 dB |
| Power consumption | |
| Max power consumption | 760 VA |
| Mains operation | |
| Max power | 451W |
| -3 dB | 340W |
| Pilot tone | 55W |
| Idle | 16W |
| 24V DC operation | |
| Max power | 12.1A (290W) |
| -3 dB | 11.4A (274W) |
| Pilot tone | 1.7A (41W) |
| Idle | 0.3A (7W) |
| Line Input s | 2 x |
| Connector | 3-pin XLR, balanced |
| Sensitivity | 1 V |
| Impedance | >20k ohm |
| CMRR | >25 dB (50 Hz to 20 kHz) |
| Gain | 40 dB |
| 100 V input | |
| Connector | Screw, unbalanced |
| Sensitivity | 100 V |
| Impedance | 330k ohm |
| Line l oop through output | 2 x |
| Connector | 3-pin XLR |
| Nominal level | 1V |
| Impedance | Direct connection to line input |
| Loudspeakers outputs | 3 x |
| Connector | Screw, floating |
| Direct output | 100 V, 70 V, 8/4 ohm |
| Priority only (from input 1) | |
| Music (non-priority) only | |
| Dimensions (H x W x D) | 100 x 430 x 270 mm |
| Weight | 12.5 kg |
| Color | Charcoal |
| Mounting | 19″ rack, 2U height |
| Operating temperature | -10 ºC to +45 ºC |
| Storage temperature | -40 ºC to +70 ºC |
| Relative humidity | <95% |
| Acoustic noise level of fan | <48dB SPL at 1m(max output) |
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