ticking noise on speakers help please

[zork]

i've got a ticking noise on my speakers,but the strange thing is that it is in my tv room my bedroom and in my gym
these room are about in total 100m apart and run on diff circuit breakers
i first thought it was maybe my decoder,but i am only running a small setup in my gym(no dstv)
so i think it is my power
i've got a electric fence,could it be some feedback from my energiser to my db board.
any advice would be appreciated
it is driving me crazy

 

[LAV]

 

[gbyleveldt]

 

[LAV]

 

[stereo247]

 

[windshear]

 

[Shonver]

 

[SeanS]