The LBB 1938 / 20 is a powerful 480 W power amplifier with

 a 3U high 19 inch chassis, which can be installed in a rack or used on a desktop. LED indicators on the front panel show the status of the amplifier: power supply, audio output level 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 amplifier 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 need 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. The gain or level control is located at the back of the device to avoid unexpected setting changes. The level meter with LED indicator bar shows the output level. The output amplifier is equipped with 70 V and 100 V outputs for constant voltage speaker systems and a low resistance output for 8 ohm speaker loads. The amplifier has two separate, priority controlled, 100 V outputs, one for areas that need only broadcast via the priority input, and the other for areas that do not require broadcast via priority input. Front of controller and indicator light · meter (LED indicator, indicating - 20, - 6, 0 dB and power on) · battery operated indicator light · overheat indicator light · air inlet, used for forced air cooling back side · level control input 1 · level control input 2 · power button · power switch

Sales telephone (same number of wechat): 13428785305 QQ: 2461903042