Yes/No/Maybe... ha ha haSorry with all the questions, for the sub I brought some 3m white and red cable from maplin, was in a rush just to get it all up and running..
You think I should also replace this cable with something better?
Cheaply made cables have poor shielding. They act as an aerial and that can then let in interference which manifest as hiss or buzzing. The sources of the interference vary, but a common one is induction noise from mains cables and poorly screened power supplies.
However, you should only change your sub cable if you can hear these problems from the sub. What's the situation for you?