Stax - SRD-7 Electrostatic Ear-Speaker Adaptor / Passive Energizer Unit Audio component

Original vintage STAX set, consisting of a STAX SRD-7 Professional adapter and the pictured electrostatic STAX headphones/earspeakers.

The SRD-7 Professional is a high-quality transformer adapter that allows suitable STAX earspeakers to be used via the speaker outputs of an amplifier. On the front there are two connectors and a selector switch for earspeakers or speakers.

The set has been tested and works well. The headphones produce sound and the adapter functions as intended.