Equipotentiality of the screen's speaker cable

Speaker cables from the connection to the amplifier, have additional cable (so-called "pig-tail"), through which we connect the speaker cable screen with zero reference potential, which in this case the amplifier chassis. The current standards of the speaker sockets do not include EMC phenomena. French expert /Alain Charoy - Electromagnetic compatibility/ says that no connection to the cable shield with the zero reference potential does nothing (apart from reducing the internal differential crosstalk). Quote reads as follows: 'The screen with no EMC connections is like a waterworks pipe which is open on both sides", so if we use cable shielding is a need to ensure that secondary disorders causing disturbances in the useful signal, are prevented from. So the screen must have the potential equalization - a pity that this subject is so far treated with neglect by the audio cables and electronics manufacturers. If we assume hypothetically that in our environment there is no electromagnetic disturbances, the shielding would be unreasonable, but of course this is not. A current very rapid development of technology causes a systematic increase in their level. The correct connection is verified (plug the network cable of the amplifier pulled out of outlet 230 V) using the probe, which is an optional speaker cables. Check the continuity of the conduction using the sampler ie by putting the sampler tip to the needle with one hand and one touch uninsulated parts of the amplifier (for example, it may be uninsulated screw amplifier chassis) and, if properly connected, the indicator will light up the sampler.