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The PRO/4AA, introduced in 1970, set a new standard. Reintroduced by popular demand, it remains in the line today.

The KRD/711, also known as the Koss Red Devil, was introduced in 1971 and discontinued in 1974.

Pictured is the K 2+2 Quadraphone, introduced in 1971 and discontinued in 1977.

The HV/1 lightweight stereophone, introduced in 1972 and discontinued in 1980.

The K/6LC Stereophone was introduced in 1972

The Travler Stereophones, introduced in 1973.

The HV/1A had a high velocity element that reproduced all ten audible octaves. It was introduced in 1974 and discontinued in 1986.

The HV/1LC expanded on the HV/1A by adding the option of a volume control. Introduced in 1974 and discontinued in 1983.

The Phase/2, a dynamic stereophone with panoramic controls, was introduced in 1974 and discontinued in 1978.

The Easy Listener stereophone with blue denim headband and accents. Introduced in 1975, discontinued in 1977.

The Phase 2+2 Quadraphone with programmer, introduced in 1975, discontinued in 1979.

In 1977, Koss expanded on an old favorite and introduced the PRO/4AAA. It remained in the line until 1986.

The ESP/10 electrostatic stereophone was introduced in 1978, and discontinued in 1984.

The HV/X lightweight stereophone was introduced in 1979 and discontinued in 1984.

ESP/9 Electrostatic Stereophones

The HV/XLC lightweight dynamic stereophone was introduced in 1979 and discontinued in 1987.