Extremely Rare Reference Electrostatic Audio Transducer. Condition is "Used". Uncanny sound field wider deeper higher all encompassing sound like MBL but much less expensive. When these are mid wall of longer dimension minimum 20 by 15 room eye to eye, when you walk between room disappears close your eyes and point to each instrument. Any distortion will be the source. Leonard Bernstein, Julie Andrews, Sultan of Brunei could have afforded any other audio transducer, but they have a pair. Those that buy never sell. I am selling to keep from very hot heat mountain wildfire damage. Escondido California area local bring box van or discuss shipping like for a concert grand piano. One unit has broken binding posts, broken while transporting. The other unit will play excellently and will have a burning smell. Unplug wait 20 minutes and plug in and again play excellently until burning smell again. Can be repaired. I could repair myself but have no facilities to disassemble because of their size. Can be repaired at Beveridge Audio. Rick Beveridge can refurbish for ten thousand then market value fifty thousand. Any other questions text to 7606389580 put in subject line Beveridge or David