[j3dprints]

IF the boxes meet Australian supply regulations - IF, then all you should need is a simple mains filter between the wall and the boxes.
One filter for the whole system would be enough.

Cheers
Roger

Thanks, and if they need something to dampen our power spikes? I believe depending on the area you're in here you can vary up to 250v or something (I'll have to check). If that's the case, and they only appreciate up to 245... ? Is it an expensive device required?