DBX 160A Hum and noise

I just bought a DBX 160A Compressor, and I'm getting this strange hum or noise when I set the gain knob above 0.

The compressor is connected to the effects loop of a Gallien Krueger 800RB amp. The send of the amp is connected to the input of the DBX, then the output of the DBX is connected to the return of the amp. That's all... They all are connected with TS cables (Tip/Sleeve).

When the gain of the DBX is set below 0 everything works just fine, but when the gain is set in 0 or above, there's this really intense hum...

I tried connecting it BEFORE the amp (not in the effects loop) and there was no hum at all, but the idea is to use it through the effects loop of the RB.

Is it the compressor, is it the amp, are they the cables? What should I do?

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