Product parameter AC : 115~230V 50~60Hz Terminating Impedance: 4 Ohm - 8Ohm THD: ≤ 0.04% Frequency Range: 20Hz - 20kHz (±1 dB) SNR: ≥ 98dB Channel: 4.0 CH A+B Left channel/C+D right channel Bluetooth 5.0 Stereo Audio Amplifier Receiver Home Theater amp | Pro Audio Stereo Receiver System 440W peak power output. 4 Channels, support 4 groups of 8 speakers.Bluetooth 5.0: Latest vertion streaming range up to 8-13m. (Please switch to bluetooth mode first and the bluetooth control distance is at an accessible distance)With Echo, bass and treble control, adjust the sound effect as you like. 2 microphone input, and mic sound also can adjust.FM Radio reach to 50 stations. (Can't save stationand Radio signal and it also depends on your location)Remote control: Infrared remote control can remotely control the volume. (Be sure in the right mode)Fit for bookshelf speakers/passive speakers/computer/TV. (Model TV section only) 4 Channel 440W Peak Power Professional integrated indoor house stereo receiver is designed as an independent 4-channel output, and the max load power can reach 440W.There is an independent anti-serial technology, so that the channels will not interfere with each other. External reading USB and SD card devices (MP3 format below 32G), and can easily loop playback.CD/DVD also can be surported. Perfect for karaoke Two microphone interfaces increase the entertainment of the AMP.Microphone volume adjustment and mixing mode increase the fun of singing karaoke.Echo/ Bass/ Treble increase the sound quality. Suitable for supermarket use, loop play and advertising use. Suitable for family use, the core equipment for multi-room system construction. Suitable for Home Party/ Karaoke Party/ Christmas Party. SPECIFICATIONS Terminating Impedance 4 Ohm - 8 Ohm Peak Power 440 Watts RMS Power 25 Watts RMS per channel, ensure your speakers match the amplifier's RMS output Working Rated Power 120V * 6A =720W Frequency Range 20Hz - 20kHz (±1 dB) AC 115V/60Hz THD < 1% SNR 83dB Channel 4.0 CH A+B Left channel/C+D Right channel Controller Type Remote Control Connectivity Technology RCA, Bluetooth, USB Compatible Devices Smartphone, Tablet, Laptop, Computer Special Features 4 Channel, 2 Microphone Inputs, Bass, Treble, Source Volume Adjustable, FM Radio Dimensions 13.78 x 8.27 x 3.54 inches Q&A: Bluetooth can't work.Please make sure you have followed the steps below to debug First, you need to check whether the bluetooth mode is turned on (when it is turned on, the screen displays BLUE). If it is not turned on, press the "BT" button or the "MODE" button to switch to the bluetooth mode.Turn on the bluetooth input device, such as a mobile phone, turn on the bluetooth function to search for the model name of the power amplifier (MAMP5), click to connect, and hear a beep (provided that the speaker has been connected), indicating that the connection is successful.Note: Regarding the Bluetooth transmitter without a screen, you only need to turn on the Bluetooth transmitter, get close to the power amplifier, and then wait for the connection. If you find that the Bluetooth connection is unstable, you can try the following steps to solve it Make sure there are no obstacles (especially metals) blocking the signal;Turn off the power amplifier, disconnect and clear the connection of the Bluetooth transmitting device, and try to reconnect;Note: If this happens at the beginning, please consult us to tell us about more details such as video, mobile phone model, etc.. Can you connect two devices with bluetooth? No, connecting two at the same time will cause the audio stream to be disrupted. It can only be disconnected and then connected to other devices. How to connect to a bluetooth speaker? The Bluetooth speaker is a Bluetooth receiver, which is the same as the Bluetooth function of the power amplifier, and the Bluetooth speaker already has a small power amplifier, which may cause burn-in after being amplified by other power amplifiers. The Bluetooth of the power amplifier is not enough, how to connect the external Bluetooth receiver? First, find the input port of the power amplifier to receive the signal, such as the 3.5mm port of AUX or the RCA port of AUDIO INPUT.Then, connect the output end of the Bluetooth receiver to the input port of the power amplifier (the port does not correspond, please use the corresponding port interface converter) Why are the volume and sound quality not as good as expected? Speaker Connection: Ensure your speakers match the amplifer's output. 25W RMS per channelPhonograph Connection: A separate preamp (not included) is required for proper volume when connecting a turntable. RCA connection is notrecommended. Why is the sound so low when connected to a phonograph? Our product lacks a PHONO input. To connect a phonograph, you'l need an external preamp (not induded). Direct RCA connection is not recommended.