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I saw this on some vintage speakers at the thrift store today and was wondering what this is. Anyone know? There was no information on speaker manufacturer on these, though one of the cabinets did have something related to the cabinet maker printed on its back, which I neglected to photograph.
 

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Looks like an Amphenol EP4-14 4-Pin sometimes call "Cannon" connectors.


This kind of connector was used mostly on pro-audio speaker cabinets primarily to secure the connection from becoming un-plugged if stepped on etc. and also to provide a quick and easy connection for set-up and tear down in pro-sound environments. The multi pin configuration also supported 2-way, 3-way, and 4-way designs. They've been more or less replaced by speakon connections today.


And then, I could be wrong. :) But that's what it looks like to me from your photo. If it is a EP4-14 4-Pin, you can still buy the connectors.


http://www.canford.co.uk/Products/44-414_AMPHENOL-EP4-14-4-pin-male-panel
 
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