Originally Posted by Fiddler
Meridian usually uses a much better grade socket. Including on 500 series.
[Linked Image from i1224.photobucket.com]

This was taken from one of my 518s, made by Jalco.
It's not great, stamped metal; the bar you can see at the rear is a flat piece with a slot cut out, this is where the signal (+) goes.

Construction like that makes me laugh when people get all anal about 75ohm RCA plugs that cost a fortune...