Amplifier board,help needed!

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Mar 2, 2025
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Hello, I've run out of ideas and would need some help, maybe there is a fix to my problem!
So I'm building a internet radio speaker and i bought 3 amplifier boards,1 for single tweeter and two to power the two midrange speakers and subwoofer. So the problem i have is with the two more powerful amplifier board's, they are putting negative trough the audio input,so basically i have a powered aux splitter and DSP 2.1 module,and when I'm connecting them to the amplifier board's there's a very loud interference noise,i can disconnect the negative wires from the splitter and DSP module and they still will have the power light on,the same with amplifier board's,if the DSP module and the aux splitter are connected to power, positive and negative then i can disconnect the negative power wire from the amplifier board's and they still will work,is there any kind of solution for this because so far the amplifier board's are not usable
 
Firstly, could you be specific about what the amplifier boards, splitter and DSP are, brand and type number.

I also didn't understand the meaning of 'negative trough the audio input'

Trying to diagnose problems if this type remotely is difficult, but will give it a go if I can.

S
 

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