Popular Science Hi-Fi Test Record (1957)

Back cover copy" A unique band consisting of a repeated 300-to-20-cycle glide tone, with cricket markers sounded 50 cycles apart, makes this test record different from any other you have heard.

High Fidelity Demonstration Record (1953)

Back cover copy: This record has been prepared specifically for the demonstration of high fidelity audio equipment, and is recommended for subjective listening tests intended to check the various characteristics of a completely assembled audio system.