Another excellent resource for info that also adds interesting tidbits about guitars and other musical instruments. Also check out the Tech Tip tab on the same page for lots of useful info on everyday topics like DAWs, sequencers, guitar pickups, and more.
Online Pro Audio References
Brochures, presentations, white papers and archives. Collected by the BBC, the largest broadcasting entity in the world.
The downloadable PDF covers mic fundamentals and mike techniques, such as positioning, for a variety of instruments using Shure microphones.
This tool allows you to calculate reverb time decay by entering room type, dimensions and wall finishes. Room mode and absorption coefficient (including over 450 materials) spreadsheets for Excel are also downloadable.
This chart shows instruments on a 20 Hz to 20 kHz diagram with a frequency translator for terms like "honk, whack and crunch."
Need to convert dBV to dBu or dBm? Or find the wavelength of a certain frequency? You'll find calculators here for that and dozens of other useful things.
Charts, graphs and PDFs of original literature for a host of old microphones along with pictures of artists using them.
21st century audio dictionary, a complete list of terms and names that is updated semi-annually.
Great source of info about mic techniques, surround setups and miking a grand piano.