Most people wire virtually all of their home theater loudspeakers to their home cinema receiver by purchasing lengthy speaker wires. Others, yet, make use of wireless surround speaker kits in order to eliminate at least the long loudspeaker cord between the AV receiver and rear loudspeakers. The power supplies for the cordless receiver has to meet certain requirements. As a result these can be produced significantly smaller sized. The external ac adapter generally is quite small too and often plugs directly into a mains outlet. A different kind of wallwart features an IEC type power jack. Those wallwarts are very similar to those used by notebooks. First of all, determined by which country the cordless product will be shipped to, a different wallwart can easily be included that is compatible with the native mains voltage and electric power plug. Furthermore, a number of wallwarts are already approved for safety. They are also less costly to change in the event of malfunction rather than exchanging the entire wireless receiver. You will find regulations regarding how warm the power supply may become and in addition how well it’ll protect itself in case of overload or over-temperature conditions. One more vital requirement would be that the power supply supply enough current to the internal wireless signal receiver as well as power amp. Therefore a large number of power sources offer two or more supply voltages.