50W+100W HIFI Digital Bluetooth AUX Audio Power Amplifier Board BASS Class D  
 
Parameter
 
 
Audio input mode switch
When this product is not connected to any external device, the default is Bluetooth mode when it is powered on ;  If an external playback device is connected,
such as inserting an AUX or U disk, it will default to AUX or U disk playback mode after power on ; Follow the priority of the last plug-in device during playback ,
for example, if AUX is inserted during bluetooth playback, it will immediately switch to AUX playback , if USB-disk is inserted during bluetooth playback, then it 
will immediately switch to USB-disk playback
1) When playing AUX, try to choose AUX cable with shielding layer to reduce noise   
2) Use MP3 format as much as possible for USB-disk playback. The sampling rate of WAV format must be within 44100Hz. if the sampling rate is too high,
playback may not be possible
3)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 can’t switch, you can manually choose to switch   
 
 
 
 
Power Supply Selction:
The power supply range of this product is DC 5-26V, compatible with standard 5.5-2.1/2.5 power adapter plugs, it is recommended to use 12V/24V standard
power adapter, the current output is above 10A
1) The power of the power supply must be greater than the sum of the power of the speakers
2) The size of the power supply is related to the power of the speakers used. If you drive a 4Ω speaker, it is recommended to use 20V, and if you drive an
8Ω speaker,it is recommended to use a 24V power supply
3) The power supply voltage cannot be higher than 26V, otherwise, the circuit board will be burnt   
4) If the power amplifier board restarts after the volume is turned up during playback, it is caused by insufficient power supply, please replace with a power
supply with a larger output current   
 
 
Speakers selection:
1) The left/right channels can continuously output 50W*2 power, 10-100W speakers can be driven, it is recommended to use 4-8Ω full-range speakers   
2) The bass channel can continuously output 100W power, 20-200W speakers can be driven, it is recommended to use 4-8Ω bass speakers, the best frequency
is 20Hz-200Hz. If you use a speaker that is less than the continuous output power of the power amplifier, you can appropriately reduce the power supply voltage or
use a lower volume to avoid noise caused by the output power of the power amplifier being greater than the power of the speaker.  If multiple speakers are used in parallel,
the total impedance of the speakers in parallel must be controlled above 4Ω. If the impedance is too small, the power amplifier will easily enter the over-current protection state.    
 
 
 
 
 
 
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