Low frequency noise from sub while connected to Grounded (3pin)signal source

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I have a problem that i am facing, that is when i connect my audio equipment to any Grounded Signal source (3pin) that is my PC, i notice some weird noise (low frequency rumble noise) coming through the sub (about 25 Hz or so) when the volume on my preamp is turned to full volume. But the noise disappeared when i mute the volume on my PC (volume control on preamp still at full volume).

Can someone help me with this problem. My subwoofer uses quite amount of bass boost at the low end ... Thanks
 
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