Help! New Nagaoka MP 500 Cart Makes Hum Ground Noise

It's pretty easy to connect the wires since they are color coded. The hum will increase if I turn the volume up. It will also flux when I touch the cart. It's a pretty simple cart to connect.... you plug it in and twist the outter shell on the arm to tighten it.

The hum is in both channels but much more louder in the right channel. Happens with the turntable power is off (but plugged in)

You need to have subwoofer and turntable plugged into the same circuit otherwise you’re grounding your table to your subwoofer if sub is connected on another circuit and that creates a ground loop. Or disconnect sub ground wire from phono stage. Why do you even ground the sub?

Thanks @audphile1 but it did not help. Good idea, though. 

Update: It has to do with the RCA cables that came with it. I found, with the volume high, if I tap the cables with my fingers I can hear the tap in the speakers!

What do ya'll make of that? These are brand new that came with the turntable! 

If the hum is audible above normal listening levels don’t sweat it. In all honesty what expectations can you have from a built in phono in your integrated? It will perform differently with different cartridges. Some will match better than others.