Koss Corporation, the leader of high fidelity stereophones is pleased to announce the introduction of PRO/4AA Stereophone. Few products receive the distinction of being equated with the industry they serve. The PRO/4AA Stereophone has been faithfully serving the broadcast and recording industries for decades. It is only fitting that Koss commemorates the anniversary of the world's first SP3 stereophone with a limited edition of this outstanding leader. The PRO/4AA Stereophone features a dynamic element and closed cushion design to deliver an outstanding frequency response and bass performance. Designed to withstand the stress and pressure of everyday studio use, the PRO/4AA incorporates an adaptable steel and plastic headband design. A boom microphone mount is included for broadcast flexibility.