• Sennheiser Frequency Finder - To find open frequencies for your wireless system, click on the link bellow.
  http://www.sennheiserusa.com/FindFrequency/
• Allen & Heath - Mixing Live with VCAs.
  http://www.allen-heath.com/US/dl.asp?file=225

Acoutics

• http://www.acoustics101.com/
  The website above contains a great introduction to acoustics. It also offers some suggestions on how to build your own acoustic panels and proper building construction techniques. Provided by Auralex.
• http://www.perdueacoustics.com/basic_acoustics.html
  Perdue Acoustics offers a free videos explaining the basics of acoustics, terminology and etc.

Audio

• http://www.shure.com/ProAudio/TechLibrary/Audio_Professional/ssLINK/us_pro_mics_for_music_sound_ea
  The PDF above, provided by Shure Microphones, has suggestions on microphone placement for live events.
• http://www.shure.com/ProAudio/TechLibrary/Audio_Professional/ssLINK/us_pro_wirelessmicrophonesy_ea
  This link, also provided by Shure, has information on how to select and operate wireless microphone systems.
• http://www.shure.com/ProAudio/TechLibrary/Audio_Professional/index.htm
  The link above is for Shure's Audio Resource Center. Please visit if you would like to see other educational articles or product information from Shure.
• http://www.rane.com/library.html#gpm1_1
  Rane has a pretty good collection of articles on different aspects of an audio system. Click on the link above and check them out.
• http://www.crownaudio.com/gen_htm/appguides.htm
  Crown Audio offers many application guides at their website. Maybe there is something there you need to know. Check it out.
• http://www.meyersound.com/products/technology/
  If you want to learn a little more about speaker technology, click on the link above and see what Meyer has to say.