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I had a problem closely with my FPS 1000 4.1 sound works four point surrond : my subwoofer sounds a metallic noise when the bass are loud. Maybe it is the same problem ? :
It were vibrations that go through the subwoofer and cause the noise.
Check the four screw well (the four hole on the back of the subwoofer). Put your finger on them to clog them and hear if your problem is solved. If yes, put scotch on them.
Secondly (i think you have disassemble your subwoofer), you can put silicon joincture on the box near the circuit, under the translucides cables. (the box where there are the plugs). >> if there are any hole between his box and the speaker, there will be some metallic noise (vibrations trough the box and the back plugs).