Headphones

[EVBoy]

A couple of interesting TS finds. Sonic four channel headphones, and Koss ESP-7 electrostatics (no energizer box, looked all over). Anyone know anything about them?

 

[asoundhound]

Best i can recall, the Sonic's are (were) mass market phones. I love vintage Koss phones, and electostats are among the nicest. I would be tempted to search high and low for the box.