Context: The term "high fidelity" was coined in the 1920s by some manufacturers of radio receivers and phonographs to differentiate their better-sounding products claimed as providing "perfect" sound reproduction. The term began to be used by some audio engineers and consumers through the 1930s and 1940s. After 1949 a variety of improvements in recording and playback technologies, especially stereo recordings, which became widely available in 1958, gave a boost to the "hi-fi" classification of products, leading to sales of individual components for the home such as amplifiers, loudspeakers, phonographs, and tape players. High Fidelity and Audio were two magazines that hi-fi consumers and engineers could read for reviews of playback equipment and recordings.

Question: What term was coined to differentiate better sounding products in the 1920s?
Answer: high fidelity

Question: What magazines provided reviews for audio equipment?
Answer: High Fidelity and Audio

Question: What happened in 1958 that changed the home music scene?
Answer: variety of improvements in recording and playback technologies

Question: During what years did the term HiFi take off with engineers?
Answer: 1930s and 1940s

Question: What term would be used when one said they produced perfect sound reproduction?
Answer: high fidelity