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Written primarily by Dave Moulton, this excellent site brings together a large selection of articles and resources for a wide range of audio-related topics.
A very interesting selection of articles detailing the success's and failures of electronics projects, audio projects and all things DIY electronics related.
Well regarded audiophile magazine published from the late 1970s up to ~ 1981. After a 6 year hiatus the magazine returned ~ 1987 and continued to 2005 after which it became a web zine. Acknowledged for scientific accuracy when evaluating audio components and a tendency to pull no punches, the web presence today appears to be updated infrequently. There are however 14 back issues which can be downloaded here. Though the equipment reviews are clearly a little dated, a number of audio topics are discussed which may be of interest to readers e.g. audio cabling, jitter, loudspeakers and "the 10 biggest lies in audio".
A recent study by David Moran and Brad Meyer (published in the September 2007 AES journal) suggests that audio professionals who participted in double-blind listening tests were unable to distinguish between high-resolution audio and standard 16-bit/44.1kHz CD quality audio. Stunning! It might also be worth mentioning that the article passed AES rigorous peer review without an argument. You can review the test setup and equipment used here. Also take a look at some comments from Mix magazine here.
Audio Diffmaker from Liberty Instruments Inc. is a freeware utility which allows users to analyse sound quality changes in an audio playback system. In a nutshell, it provides the ability to subtract one audio file from another which allows us to hear the differences between them. For example, if you changed the cabling or interconnects within a system, and providing you had a before and after recording, you could determine if there is an audible difference. Very useful.
Dedicated to the DIY hi-fi enthusiast, Decibel Dungeon features an interesting selection of articles and tutorials aimed at an entry level and hobbyist audience. There's a schematic for a mains power conditioner which is interesting plus a short description of why serious audio systems need mains conditioning. Other topics include upgrading and building loudspeakers and the age old controversy surrounding hi-fi cabling
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From Home Theater Shack, Room EQ Wizard is a Java application (Mac, Linux & Windows) for measuring the response of a room and for the investigation of modal resonances. Did I mention it's free (you need only register with HTS)! All the standard features and tools one would expect from such a utility are present plus you can export the filters impulse response as an audio file to be used with a convolution plugin. This definitely deserves a closer look!
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Guitar players might find this useful; a simple test for ground loops in electric guitar rigs. Provided by Pedal Snake.
BBC R&D have produced numerous technical documents over the years - many are highly regarded. Here they provide a selection of the documents, for public interest.
In response to numerous similarly aimed queries over the past few weeks I've listed below three headphone sets with which I've had good or better experience. I should state from the outset, the recommendations are directed at those with an interest in high fidelity.
Outstanding resource providing a wealth of information on loudspeakers and their design, sound reproduction, room acoustics and much much more.
Crossover Designer - 2-Way Crossover designer
Sound Studio and Audio Calculations - Online Acoustics Conversion Engine. Outstanding!!!
Speed of Sound - Calculate speed of sound in humid air
