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The following articles and papers are classic papers that I find significant to further our understanding of audio technology.
These papers are generally quite old, and it would be difficult if not impossible to find a copyright holder. Still, these are original works and I would ask you to use them only for personal study and research.
Should you want to use any of this material for a commercial endeavor, please check with any remaining copyright holders before doing so.
On feedback and related subjects:
Small-Signal Distortion in Feedback Amplifiers for Audio, James Boyk and Gerald J Sussman, April 2003
Combining positive and negative feedback - John M. Miller, Electronics, March 1950. First commercial successful design using a combination of positive and negative feedback to lower distortion that I know of. Tubes, of course.
Feedback Amplifier Analysis Tools by TI's Ron Mancini. Clear expose on amp stability issues and how to avoid them.
Audio design leaps forward? Giovanni Stochino, EW&WW, Oct 1994.
Generalized op-amp model simplifies analysis of complex feedback schemes - Jerald Graeme, Burr-Brown Corporation. EDN, April 1993
Negative feedback and non-linearity - Exploring the fallacy that nfb reduces all harmonics equally - Cathode Ray, Wireless World Oct 1978.
Note: Cathode Ray was a nom de plume of M. G. Scroggie
Amplifier design for low Transient Intermodulation Distortion:
Matti Otala's Low Tim Amplifier from AES preprint H-6(R) from Feb 1973
Even more classics: click here
On perception and (subjective or objective) testing:
Audio - Science in the service of Art, by Floyd E Toole, PhD, at the time Vice President Acoustical Engineering, Harman International Industries, Inc.
Very balanced paper about issues connected to subjective listening tests and bias.
My own tests: On 9 April 2012 a few members of the NL AES section met at the residence of Hans van Maanen, 'mister temporal coherence'. We listened to 15kHz brick-wall filtered (and heavily phase-shifted) music and tried to hear a difference with the same music unprocessed. Yes we did hear a difference! Read my little report!
On audio power amplifier design and related subjects:
Between Amplifier and Speaker - Ivor brown, Electronics & Wireless World, Feb 1995
"Un ingénieux dispositif réducteurde distortion pour amplificateurs de puissances", Revue du Son, No 242, Juin 1973. This is an early realization that in my opinion is identical in concept to Hawksford's error correction scheme. In French, but it refers to an article in Wireless World. If you have that one, I would love a copy!
Miscellaneous subjects:
Making the Best of an Audio Transformer - Norman H. Crowhurst, Audio Engineering, 1953
A new distortion mechanism in class B amplifiers - Edward M. Cherry, AES Engineering Report, May 1981
Inaudible High-Frequency Sounds Affect Brain Activity: On the perception (or not) of frequencies above 20kHz
A great little utility called ResCalc - that calculates series/parallel resistor values for you to get that non-standard value. Written by Mark Lovell and Morgan Jones.
Everything about RFI, ground loops, pin 1 problems etc for audio. An extensive library well worth perusing! Generated and/or collected by Jim Brown at Audio Systems Group
