Well,there is only one that it has the thump in one channel , it is an "integrated amplifier"using LM3875.the sound is very clean,no noise at all.but the only thing was the"THUMP"in one channel that it is!.but, I will fallow what "PinkMouse" said. thank you guys for wonderful help.
Check your cabling. I recently changed internal signal cables using shielded pair and it creates switch-off thump ... I can't even explain why.
Wired it back using usual cables and all are good.
Wired it back using usual cables and all are good.
If you disconnect the speaker and put a voltmeter on the output I'm sure what you will see is a large DC voltage a few seconds after the power switch is turned off. When the speaker is connected it loads the amplifier and dissipates the power supply energy.
If the chip is not supposed to do this then you might try watching the power supply discharge with a meter and see if both caps discharge at the same rate.
If the chip is not supposed to do this then you might try watching the power supply discharge with a meter and see if both caps discharge at the same rate.
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