TDK SA-X

Magnetic Particle: Super Avylin (dual layer)

Coercivity: 620 Oe
Remanence: 1650 Gauss
Squareness Ratio: 0.83

Operating Bias: +1.0dB
MOL 315Hz: +4.0dB
MOL 10kHz: -7.5dB
Sensitivity at 315Hz: +1.0dB
Sensitivity at 3.15kHz: 0.0dB
Sensitivity at 10kHz: +1.0dB
Sensitivity at 16kHz: +3.0dB
Bias Noise: -61.0dB

TDK SA-X was top of type II cassettes. The formulation is dual layer is based on Super Avilyn particle. It offers improvement over TDK SA in the high end of the audio spectrum. It appreared first around 1979.