If the noise you hear comes from the tweeter or the midrange speakers, it means your amplifier is noisy; if the noise comes from the woofer, then the internal amplifier (it has its own) of the speaker is noisy. If both speakers are noisy, it is most probable that the "static noise" you hear comes from the external amplifier, which you will have to check or change.
SOURCE: Load Clicking Noise on Deep Bass or Explosion sequences
When you play to loud, the sub element hits the magnet and thats the sound you are hearing. Nothing wrong with the speaker, but you could damange your sub element doing this several times.
Solution, turn the volume done.
The speakers sound great, but remember there are only 2 7" speakers, they cant produce an earthquake. For that you need bigger subbs.
SOURCE: It is an old speaker (DM601 S2) but well cared
It sounds
like a ground problem with the speaker crossover circuit or the amplifier. Turn
the amp off and disconnect one speaker and interchange it with the other using
the same speaker wires. If the static speaker is now working interchange the
speaker wires and try it again. Or if the same speaker still has static it is
the speaker. If the static is on the same channel then you have a bad wire or
if both channels work it was a bad connection.
If the problem remains on the same channel change the speaker wires. If
the problem switched to the other channel then it is a bad speaker wire or
connection. If the same speaker has the same problem it is most likely the
crossover circuit in the speaker which is used to filter frequencies of the
audio signal by using capacitors and coils. If the static speaker is now working
and the other speaker is now not working it is the amplifier. If the static
problem is on all input devices I would trouble shoot the preamp section of the
amplifier.
Check for the Third earth wire of your computer else check for the motherboard taking earth for the cabinet.
Good luck
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