The 120 W power amplifier adopts a compact cabinet u 70 V

 / 100 V and 8 ohm output U. the input u with priority switching function is used for the forced ventilation from the front to the back of the 100V input u for subordinate operation on the 100V speaker line to realize temperature control. LBB 1930 / 20 is a powerful 120 W power amplifier with 2U high 19 Inch chassis, can be used in the cabinet, can also be used on the desktop. The LED indicator on the front panel shows the status of the amplifier: power supply, audio output pole and a variety of monitored functions. This high-performance device can meet a variety of public broadcasting requirements at a very low cost. Basic function reliability amplifier has overload and short circuit protection functions. Temperature controlled fan can ensure high reliability at high power output and low noise at low power output. When the internal temperature reaches the critical limit due to poor ventilation or overload, the overheat protection circuit will shut down the power amplifier assembly and activate the LED indicator on the front panel. The device can use either AC power supply or 24 V emergency battery power supply, and can automatically switch between the two. For emergency evacuation applications, the following functions are monitored: AC power status, battery power status, pilot tone status, and amplifier operation status. The front panel LED indicator is used to indicate the status of the monitored function. For conventional public broadcasting occasions, the user can turn off the LED indicator for pilot tone monitoring and battery status. Each monitored function is equipped with a fault protection (power on close) relay. These relays are always active regardless of the switch status on the rear panel. The input system is equipped with two balanced inputs with priority control, and each input has a loop device. This makes it easy to connect to remote systems that require priority control. In addition, an additional 100 V line input is provided to connect the amplifier to the 100 V speaker line, providing greater power for remote locations. Gain or level control is located at the back of the device to avoid unexpected setting changes. Instrument display output level with LED indicator bar. The output amplifier is equipped with 70 V and 100 V outputs for constant pressure speaker systems, and a low impedance output for 8 ohm speaker loads. The LBB 1930 / 20 has two separate priority control 100 V outputs, one for areas that only need to be broadcast by priority input, and the other for areas that do not broadcast through priority inputs. Front panel of control and indicator light · meter (LED indicator light, indicating - 20, - 6, 0 dB and power on) · battery operated indicator light · overheat indicator back panel · level control input 1 · level control input 2 · power button · back panel of power switch interconnect assembly · priority line input 1 (XLR / balance) · line loop 1 (XLR / balance) · Program line in 2 (XLR / balanced) · line loop 2 (XLR / balanced) · speaker output with priority control, 24 VDC power supply terminal, three speaker direct output terminals, two 100 V auxiliary input terminals, input 2 enable control terminal, input 1 priority control terminal, ground connection screw, power socket certificate and approved safety comply with en 60065 standard immunity to en 55103-2 radiation to en 55103-1 emergency compliance to en 60849 regional certification European CE cpd Poland cnbop accessories quantity assembly 1 LBB 1930 / 20 variegated power amplifier 1 power cord 1 19 inch mounting bracket Kit 1 safety instructions 1 cable with XLR connector technical specifications electrical specifications AC power supply voltage 230 VAC ± 10%, 50 / 60 Hz inrush current 8 a maximum power consumption 400 VA battery power supply voltage 24 VDC + 15% / - 15% maximum current 6 a performance index output power (RMS / max) 120 / 180 w standby power reduction - 1 dB frequency response 50 Hz to 20 kHz (+ 1 / - 3 dB, - 10 dB reference rated output) loss of truth < 1% (rated output power), 1 kHz signal to noise ratio (flat at maximum volume) >90 dB line in 2-way connector 3-pin XLR, balanced sensitivity 1 V impedance 20 K ohm CMRR > 25 dB (50 Hz to 20 kHz) gain 40 dB 100 V input connector screw, unbalanced sensitivity 100 V impedance 330 K ohm line loop output 2-way connector 3-pin XLR rated level 1 V impedance directly connected to line in speaker output 3-way connector Screw, floating direct output 100 V, 70 V, 8 ohm priority only (from input 1) 100 V or 70 V, internal optional music only (non priority) 100 V or 70 V, internal optional power consumption AC power operation maximum power 274 W - 3dB 193 W - 6dB 143 w pilot tone * 41 w idle 18 w 24 VDC operation maximum power 7.0 a (168 w) - 3 dB 6.0 a (144 w) - 6 dB 4.3 a (103 w) Pilot * 0.9 a (22 w) idle 0.1 A (2.4 w) * 20 kHz - 20dB, maximum speaker load

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