speaker problem?

[Lt. Aldo Raine]

ok so when i watch movies tv w.e, in some parts when ppl are talking the center channel crackles abit, and with some sound effects mostly loud ones, in the C/L/R it crackles abit, whatever speaker the sound effect is coming from, what is causing this?
how do i find out what it is?
is it the receiver? sony str dg720
is it the speakers? energy c-c100, and c-200s
or is it the speaker cable? i am currently using i think 16gauge, im not even sure what the gauge is but it looks around 16, when i bought it it didnt even say on the package,didnt really care at the time cause i got it at a huge discount, its monster cable and im jus have them hooked up bare

please help

i plan on upgrading receiver soon with 12gauge speaker wire and banana plugs(cause then the new receiver will take them), hopefully this helps if anything and its not a problem with the speakers!