DCX2496 buzz

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Hi everyone,

I just purchase a DCX2496 for my 3 way speaker. Upon plugging in to the amp, I got this loud buzz/hum from my speaker. The connection diagram is as follow:
Notebook -> Audio Kontrol 1 (USB) -> TRS to XLR cable -> DCX2496 -> XLR to XLR cable -> UCD amp with XLR input.
I have try unplugging the dcx2496 from the wall socket, the hum got softer but still very loud, what could be wrong...
 
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