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I have this surround sound system at home that is very old and have these strange sound input sockets that I have never seen before. Does anyone know what kind of input socket this is?

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  • Possibly helpful – isherwood Jul 27 '18 at 15:47
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    That reminds me of an old DIN Loudspeaker Connector, except that your one has 2 round pins - one on each side, in addition to the flat one. – brhans Jul 27 '18 at 15:58
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    I would think that those are not the actual inputs, rather the sound level adjustments using a special square tool to prevent unauthorized tampering. Actua inputs are probably in back of under a removable panel – Limo DRIVER Jul 27 '18 at 16:36
  • But if you look at the sockets they seem to have a copper connector or something similar. – João Matos Jul 27 '18 at 17:16
  • could be a custom connector, i've never seen one like that before, and i've seen a lot of audio connectors... – dandavis Jul 27 '18 at 17:19
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They appear to be the 220V inputs (source feeds - Fuente alimentación) for each device; (L and R) as each input looks like it has two connection points. It has a custom connector that I cannot identify. If you can read spanish the manual more information is here: www.kroser-electronica.com/descargas/catalogo2007.pdf

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