Audio input mode switch:  

  When this product is not mounted with any external audio device, the power-on default is Bluetooth mode; if the external playback device is mounted, such as inserting an AUX or U disk, the power-on default is AUX or U disk playback mode; the playback process follows the priority of the rear plug-in device In principle, such as inserting AUX during Bluetooth playback, it will immediately switch to AUX playback; switching audio modes can also be switched by APP, which is very convenient.  

  When playing AUX, try to choose AUX cable with shielding layer to reduce noise.  

  The MP3 format is recommended for U disk playback, and the sampling rate of the WAV format must be within 44100Hz. If the sampling rate is too high, the playback may not be possible.  

  When using the USB sound card function, you can connect the computer with a USB data cable without installing any drivers. Most computer systems will switch the USB sound card by default. If it can’t switch automatically, you can manually select the switch.  

  Power selection:  

  This product has a power supply range of 5-26VDC and is compatible with standard 5.5-2.1/2.5 power adapter plugs. It is recommended to use a 12V/24V standard power adapter with a current output of more than 4A.  

  1) The size of the power supply is related to the power of the speaker used, such as using a 4 ohm 100w speaker, using a 24V power supply, and the current is at least 6A. If the current is too small, the sound may be stuck. Reduce the volume and reduce the output power to solve this problem .  

  2) The power supply voltage cannot be higher than 26V, higher than 26V, the circuit board will be burned.  

  3) If the horn does not play when the power is turned on and keeps making a ticking sound, which is caused by insufficient power supply, just increase the power supply.  

  Speaker selection:  

  The power amplifier of this product can continuously output 100Ww*2 power when driving 2Q speakers. Speakers from 50W to 300W can be driven. 2 ohm, 4 ohm or 8 ohm speakers are recommended. If the power is less than 100W speakers, appropriately reduce the power supply voltage (such as 20V power supply) or reduce the playback volume; the greater the power supply voltage of speakers greater than 100W, the better (within 26V).  

  If there is a "hiccup" phenomenon when playing music speakers, first consider the insufficient power supply and use a larger power supply; second, consider the power amplifier overheating protection, strengthen heat dissipation or reduce the playback volume.  

  Signal problem:  

  This product uses a PCB antenna, and the visible distance of the connection can reach 15 meters without obstruction. If you can't find Bluetooth when you use it, or you can't connect to it, consider the signal problem.  

  1) Keep away from the router when using it.  

  2) Avoid using it on a metal table, which will affect the PCB antenna signal.  

  3) If you refit the speaker, if it is a metal shell, you must lead the antenna out of the shell. The metal shell will shield the signal.