Braun speakers of the period used captive speakers leads (16 feet), and I've chosen to leave them. They're small diameter, but decent quality,suitable for the kind of vintage receivers (with their many old small connectors) that these speakers are likely to be paired with. In the past with other Brauns, I've cut into the cabinets and installed modern connectors, but am not convinced that the subtle improvement was worth defacing a classic Dieter Rams cabinet design for.
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I photoshopped out the wires in this picture to make sure you're paying attention.