Esoteric Grandioso S1X Manual Del Usuario página 11

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Precautions when connecting speaker cables
Connect the cables securely so that they do not become loose
and the core wires or terminals at their ends do not become
exposed and contact other metal parts or the unit.
Notice about the European model
In accordance with European safety regulations, connecting
banana plugs to speaker terminals is not allowed on European
models.
The holes into which banana plugs could be inserted have been
covered with black caps. Connect speakers using bare wires or
spade connectors.
If a black cap should become separated from its terminal, return
it to its original position.
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