เพาเวอร์แอมป์ BOSCH LBB 1938/20 แบบ 70V/100V และ 8 โอมห์ 480 วัตต์ BOSCH LBB 1938/20 Power amplifier จากแบรนด์ BOSCH
BOSCH LBB 1938/20
20 Power amplifier, 480W
คุณสมบัติ
- 480 W power amplifier in a 3U high 19” housing
- EN 54‑16 certified
- 70 V / 100 V and 8 Ohm outputs
- Dual inputs with priority switching
- 100 V input for slave operation on 100 V speaker line
สเปค
Mains power supply
| Voltage | 220/230 VAC, ±10%, 50/60 Hz |
| Inrush current | 19 A |
| Max power consumption | 2200 VA |
Battery power supply
| Voltage | 24 VDC +15% / -15% |
| Current max | 30 A |
Performance
| 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 |
100 V input
| 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 |
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) |
| 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 |
| 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) |
