Audio Amateur 1/1979 PDF

Audio Amateur 1/1979 PDF - Issue is in black & white
Scan of printed copy, PDF download immediately upon purchase

• Showcase: The "Super B--e" 901: Discover Gunter Roehricht’s massive 180-pound direct/reflecting loudspeaker system. Inspired by the theories of Prof. Bose, this custom build features high-end English Jordan Watts drivers and integrated 150W RMS amplifiers for a truly unique listening experience.
• Guest Editorial: The Evolution of the Recording Studio: Veteran console builder Neil A. Muncy provides a sobering look at how the signal path in recording studios has changed. Learn why modern signal processing gimmicks might be mangling the audio you hear on your favorite records.
• The Mark I: A Low Distortion IC Preamplifier: Build a state-of-the-art preamplifier that rivals expensive discrete designs. This high-performance unit leverages the latest generation of integrated circuits to achieve incredible slew rates and ultra-low noise, all in a compact, home-construction-friendly package.
• Subjective Evaluation of the Mark I: Does the measurement-perfect Mark I sound good? David Vorhis puts the unit through rigorous subjective listening tests, comparing it against the Hafler preamp to see how IC performance stacks up against the competition.
• Scientific Audio Criticism: Tired of vague, poetic equipment reviews? Dr. Lawrence Greenhill explores techniques to improve the reliability and validity of listening tests, introducing psychological research methods to help reviewers move past personal bias.
• The Warbler: Stop struggling with room reflections when testing your speakers. This clever project is a low-cost 1/3 octave warble tone generator that allows you to accurately measure loudspeaker frequency response in your own home without needing an anechoic chamber.
• The NQPR Revisited: Dive into the physics of drone speaker cones (passive radiators). David Ross sheds light on how undriven speakers can be tuned as tunable vent-substitutes to significantly extend the bass response of your system.
• Audio Aids: This issue is packed with reader-submitted tips, including a simple power supply modification for the Dyna Mark III, instructions for adding 78RPM capability to a Philips turntable, and a fix for annoying "pops" in Soundcraftsman equalizers.
• In-Depth Test Reports: Get an expert’s take on Heath’s Continuing Education course in electronics, and learn the most effective methodologies for evaluating loudspeakers through listening tests and professional records

• Showcase: Gunter Roehricht .................................................................................................................... 2
• Guest Editorial: by Neil A. Muncy ........................................................................................................ 4
• The Mark I: A Low Distortion IC Preamplifier / Control Unit: by Michael Lampton and Donald Zukauckas ........................................................................................................ 5
• Listening Tests on the Mark I: by David Vorhis ............................................................................. 5
• Issues of Reliability and Validity in Subjective Audio Equipment Criticism: by Lawrence L. Greenhill, M.D. ............................................................................................................... 17
• The Warbler: by Dick Crawford ........................................................................................................ 22
• The NQPR Revisited: by David Ross ............................................................................................... 28
• Audio Aids: by readers Squires, Hill, Caldwell, Thompson, Winn, Hardwick, Moritko, and White ............................................................................................................................................ 34
• Test Reports ............................................................................................................................................ 44
  • Heath's Continuing Education: Electronic Circuits by Ronald H. Miller
  • How to Evaluate Speakers by Frederick M. Gloeckler, Jr.
• CORRECTIONS ............................................................................................................................... 49, 50
• LETTERS ................................................................................................................................................... 49
• CLASSIFIED .............................................................................................................................................. 59
• AD INDEX ................................................................................................................................................ 62