the balanced input of four low-noise microphones or lines in a single-zone or dual-zone hybrid amplifier from 3W to 12W. The microphone input 1 has optional priority and the sound control switch has optional two tones. The bell prompt signal before broadcasting, the emergency input set up separately, and the connection of the functional speakers with audio and preemptive control can be divided into ordinary, call-only, or mixed-only, with optional CD, tuner, Or auxiliary music input Banli hybrid amplifier is a high-performance, multi-purpose mono hybrid amplifier with four microphone inputs, which can meet the requirements of various public broadcasting applications at an incredibly low price. Various types of sockets are used for input to facilitate use: balanced 3-core XLR and 6.3mm microphone sockets are used for microphone input, 5-core DIN sockets are used for priority microphone input, and stereo lotus sockets are used for music input. All microphone inputs have phantom power supply for condenser microphone and voice filter for improving sound quality. Microphone inputs 3 and 4 can also be converted into line sensitivity. In addition, there are independent music inputs with their own input selectors and volume controllers. Through internal selection, microphone input 1 can be configured to have the highest priority over other microphones and music inputs. When the contacts are closed, or when the signal level of input 1 exceeds the predefined value (VOX), the 5-core DIN socket is given priority. When the priority contact is closed, a 2-tone prompt signal can be selected to be added before the broadcast notice. Voice activated telephone or emergency input has higher priority than microphone, and it has its own volume setting. The interconnection function independent of the main volume control input and output makes it convenient to access external sound processing equipment, such as equalizer, or add acoustic feedback suppressor between preamplifier and power amplifier. Provide a tape output, and the VU table of LED can monitor the main output. Banli hybrid amplifier includes models with output power of 3W(LBB 193/1), 6W(LBB 196/1) and 12W(LBB 1912/1). The power output can be directly added to the output of 7V or 1V constant voltage, or added to an 8 ohm load with low impedance. The amplifier has a separate 7V/1V "mixed only" output, which broadcasts to areas that do not need to listen to emergency notice. "Call only" output can also be used for forced control of 3-wire remote volume controller. LBB 1914/1 and LBB 1912/1 have the same function, but it has two front panel switches, which can direct the output of the amplifier to two separate areas. This is a useful feature if some announcements or background music are only heard in certain parts of the building. However, priority calls, whether chosen or not, are always sent to two districts, even if background music is chosen. If the power of the hybrid amplifier itself is not enough, its balanced line output can be connected in series to the Banli power amplifier (LBB 193/X 12W or LBB 1935/X 24W). Electrical emergency/telephone input (spiral wiring board, balanced) mains voltage 115VAC/23VAC, plus or minus 1%, 5/6Hz sensitivity 1mV-1V adjustable maximum mains power consumption LBB 193/1 1VA impedance >; 1k ohm LBB 196/1 2VA voice control input threshold 5mV LBB 1912/1 level rise time 15ms LBB 1914/1 4VA release time 2 seconds Maximum commercial power surge LBB 193/14.5A/9A (23VAC/115VAC) signal-to-noise ratio (flat at maximum volume) > 65dB LBB196/15A/1A (23VAC/115VAC) Interconnection (Lotus Socket) LBB1912/1Nominal Level 1V LBB1914/18A/16A (23VAC/115VAC) Impedance >: 1k ohm battery voltage 24Vdc, +2%/-1% output maximum battery current LBB 193/1 1.6A Main output (3-core XLR, balanced) LBB 196/1 3A nominal level 1V LBB 1912/1 6A impedance <; The output performance of 1 ohm LBB 1914/1 speaker (spiral terminal board, floating ground) is maximum/nominal output power, and the frequency response of 7/1V is 5 Hz-2 kHz LBB193/145 W/3 W (+1/-3 dB, based on -1dB/rated output) LBB196/19 W. 1%, rated output, 1kHzLBB 1912/1 bass control 8db @ 1khz lbb1914/118w/12w treble control 8db @ 1khz 8 ohm output input LBB 193/116V(3W) input 1(5-core DIN/ balanced/phantom power supply /6.3mm socket) lbb196. 122V(6W) input 2(3-core XLR/ balanced/phantom power supply /6.3mm socket) LBB 1912/1 sensitivity 1mV LBB 1914/131V(12W) impedance >; The output powered by 1k ohm 24V battery is relative to the rated power -1dB, and the signal-to-noise ratio is 63dB (flat at the maximum volume). The signal-to-noise ratio of environmental conditions >: 75dB (flat at minimum volume) operating temperature range -1 to +45℃*** mode rejection ratio >; 4dB(5Hz-2kHz) Storage temperature range -4 to +7℃ Remaining >: 25dB relative humidity <: 95% voice filter -3dB @ 315Hz, Qualcomm, 6dB/ octave conventional phantom power supply 16V, 1.2K ohms, only used in microphone mode. EMC radiation conforms to EN5513-1VOX input level rise time of 15ms (only input 1)EMC anti-interference conforms to EN5513-2 release time of 2 seconds. Fan noise is measured at 1m <; 4dBSPL input 3-4(3-core XLR socket/balanced/phantom power supply /6.3mm socket) only LBB 1912/1 and LBB 1914/1) Sensitivity 1mV (microphone), 2mV (line) External dimension 1×43×27mm Impedance >: 1K ohm (microphone) (19 inches wide and 2u high 2U) > 5K ohm (line) weight signal-to-noise ratio >: 63dB (microphone), > 7dB (line) LBB 193/1 is about 5kg >: 75dB (flat at minimum volume/mute) LBB 196/1 is about 8.5kg * * * mode rejection ratio >: 4dB(5Hz-2kHz)LBB 1912/1 Residual >: 25dB LBB 1914/1 About 1.5kg voice filter -3dB @ 315, Qualcomm, 6dB/ octave 19-inch rack mounting plate phantom power supply 16V, 1.2k ohm (for microphone only) LBC 191/ needs to order music input (Lotus jack, stereo converted into single sound) separately. Sensitivity 2mV impedance 22k ohm signal-to-noise ratio >: 7dB (flat at maximum volume) signal-to-noise ratio >: 75dB (minimum volume flat/mute) surplus >: 25dB