The 9S is like an extended version of the 5S, so it needs neither batteries nor mains supply.
There are nine DIN sockets for the 'rim' connections, and one for the 'hub'. The rotary 'route select' switch has ten positions - which can link the 'hub' to any one of the 'rim' connectors, or the off position.
The robust ABS enclosure is 109mm x 109mm x 40mm. There are spaces on the hardy polyester panel label where you can write the ‘hub’ connection names.
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