Avoid multi-way power extensions
The ideal solution is to have each component plugged directly into a wall socket. The use of an extension means that there is another set of joints in the path of your mains voltage, usually a neon light adding its own noise and sometimes an additional fuse or breaker. On top of this, the internal wiring and the components used may be of questionable quality in the context of an expensive hi-fi home theatre system. If you have to use an extension of some sort but can plug at least some of your equipment directly into the socket, it is often worth experimenting since some components are more affected by mains supply that others. We find that usually the amplifier or power amplifier benefits most from being plugged in directly.
Keep connections clean
Unless they are gold plated, all of the signal and mains connections between the various components will oxidise over time. This reduces the metal to metal contact and increases the impedance leading to poorer performance. It is a good idea periodically to clean these connections. Usually, this can be achieved (with the system and mains switched off) by plugging and unplugging each connection a number of times. The use of cleaning solutions can in some circumstances leave deposits or residue behind. This is best avoided in normal circumstances, particularly on delicate signal connectors.
Use quality mains fittings
Not all plugs and sockets are created equal. Cheaper sockets generally have poorer quality construction and materials; while they may be fine for powering your steam iron they can have an adverse impact on the quality of mains supply to your system. One prime example of this is the use of steel rather than copper earth bars in cheaper sockets. It is generally better to use unswitched sockets unless you have the safety worries that come with small children - any extra switch or break in a mains or signal path is undesirable. We recommend MK or Crabtree plugs and sockets.
Keep audio signals away from mains cables
If the back of your system looks like electrical spaghetti, you might wish to neaten it up somewhat. Mains cables and to some extent speaker cables carry substantial currents and voltages and as a result generate magnetic fields. These can in turn, cause currents in nearby conductors. If these happen to be cables carrying low level signals, the effect of this 'noise' can be significant. It is best to keep your signal cables away from this noise by at least a few cm and try not to let them run parallel to mains cables. If a signal cable has to cross over or touch a mains cable, it's best if this is at right angles.
