Steve Guttenberg

The AVR-5800 may be the most iconic Denon AV receiver of all time. It debuted in 2000 to commemorate Denon's 90th anniversary and was the world's first 7.1 channel receiver, the first with DTS-ES Discrete 6.1, DTS-ES Matrix 6.1, and THX Surround EX (the forerunner of Dolby Digital Surround EX). Before the AVR-5800 arrived AV receivers, including the biggest flagship models, were all strictly 5.1 channel affairs.

The Nagra I was the first portable reel-to-reel recorder. Before it arrived in 1952 tape machines were so big they were housed in large trucks and the microphones could never be more than a few hundred feet away from the recorder.

The Klipschorn was such a revolutionary speaker, it can still hold its own with some of the best of today’s home theater speakers. Paul W. Klipsch founded his company in 1946 in Hope, Arkansas, and built his first 12 Klipschorn speakers in 1947. They were fitted with Western Electric 713A compression tweeters and 12-inch JBL or Jensen woofers. The Klipschorn was designed to fit into the corner of a room, using the walls and floor as extensions of the speaker’s bass horn.

The Acoustical Manufacturing Company’s Quad ESL-57 was the world’s first production full-range electrostatic speaker. It debuted in 1957 when hi-fi speakers were big boxes and used moving-coil drivers, so the ESL-57’s flat-panel, downright minimalist design not only looked like a radical advance, its thin-film diaphragm’s low-distortion and lightning-fast transient response sounded truly revelatory to 1950s audiophile ears. The speaker’s introduction came not so many years after the transition from 78-RPM records to higher-fidelity LPs took place. The market was primed for a more transparent transducer technology, and Quad had the best-sounding speaker of the age.