For what they cost ( Â£84.99 :D ) these are very good PC speakers and for that they deserve 5 stars. Sound is clear and there's plenty of Bass both of which can be independently controlled.
Connecting them is very simple as all the cables are fitted to the L & R speakers and once in position are then connected to the Sub-woofer (which is clearly marked and as with all subs can be positioned anywhere convenient fairly close by), Finally there's a single 3.5mm jack to connect to the PC. There is no separate transformer for the speakers as that is incorporated in the Sub-Woofer which connects directly to the mains with the cable provided. If your speakers start humming this is simply because the mains cable is interfering with the speaker cables.