I sell one pair of "new" Audio Magic Signal Purifier for speakers Reference Special Version with ETI Research Silver Bayonet banana plugs. Simply attach the purifier banana plug end to the positive binding post of your speaker and then attach your positive speaker wire "banana or spade plug" to the binding post of the purifier. It comes with its jewel case and I have opened the box to take pics only.
With these great special pasive purifiers you will get a new level of quiet, much better air and space, layering, detailed and dynamic sound.
P.S.: My special offer price is free shipping to Worldwide by International Certified Mail.