This Product Is Xh-A310 Power Amplifier Board With Tuning, Using Chip For Tda3116d2 Digital Power Amplifier Chip, With Four-Channel Dual Stereo, Support U Disk Playback, Bluetooth Playback, And Aux Input Inheritance 3.5 Audio Interface. The Problem Of Power Supply, Is It Better To Share One Power Supply Or Separate Power Supply? It Is Good To Share A Power Supply Normally, If There Is Noise In The Shared Power Supply, It Needs To Be Supplied Separately; Questions About The Length Of The Bluetooth Connection Distance. After Testing, The Distance Of Different Mobile Phone Connections Is Not The Same, And The Oppor9m Bluetooth Connection Distance We Tested Is Only 2-3 Meters. The Bluetooth Connection Distance Of And Mobile Phones Can Reach More Than 20 Meters. The Volume Is Turned Up And The Sound Is Stuttered And Intermittent, And It Can Be Played Normally After The Volume Is Turned Down. One Of The Reasons: Due To The Power Supply Power Is Too Small, Bluetooth Power Amplifier Board Is 300w, And Voltage Is Above 21v When Selecting The Power Supply, And The Current Is 15a Or Less. Reason Two: If The Power Supply Is Fine, It May Be That The Power Of The Speaker Is Too Small,The Volume Is Turned On, There Will Be A Lag Phenomenon, And Speaker May Burned Too Much Noise When Playing Music, Or No Music Playing Has A Noise Floor. The Main Source Of Noise Is The Radio Clutter In The Environment Generated By The Amplification Of The Power Amplifier Board, So As Long As It Is The Power Amplifier Board, There Will Be Noise. Therefore, The Audio Cable Should Be Shielded As Much As Possible. There May Be Noise From The Audio Source. And Our Company'S Amplifier Board Is Not Compatible, You Can Increase The Audio Isolator Or Coupling Capacitor. Bluetooth Not Connecting. Bluetooth Indicator Light Is Regular Flashing When Working Normally, If It Is Long Or Not Bright, There May Be Problems With The Bluetooth Module. Mobile Phones Can Connect, But Laptops Or Desktops Cannot. If The Mobile Phone Can Connect, There Is No Problem With The Bluetooth Amplifier Board, It May Be That There Is A Problem With The Computer'S Bluetooth Driver, It Is Recommended To Uninstall It First And Then Install The Latest Version Of The Driver From The New 1. Product Name: Bluetooth Audio Amplification Board 2. Function Type: Amplify The Audio 3. Chip Type: Tpa3116d2 x 3 4. Bluetooth Version: 5.0 5. Number Of Channels: 4 6. Output Power: 2 x 50w Full Tone + 2 x 100w Bass 7. Magnification: 30x size: 16.7 x 12 x 3.8cm Material: plastic colour: As shown Package Contents: 1 x Bluetooth Amplifier Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.