” +/-3 dB or -6 dB, What’s the Difference? “ pdf (QSC) Written by: Gerry Tschetter Date: September 15, 2009
The purpose of this document is to explain the meaning of both specifications as they are commonly used (or misused) in pro-audio today and provide a basis for comparing loudspeakers with differing stated specifications.

Glossary of Audio Terms (Galaxy Audio)

Audio Specifications (Rane)
This note introduces the classic audio tests used to characterize audio performance. It describes each test and the conditions necessary to conduct the test.

No Such Thing as Peak Volts dBu (Rane)
It is incorrect to state peak voltage levels in dBu. It is common but it is wrong.

Calculating dB’s  (Community Pro Audio)
Calculating dB, volts, and SPL made easy.

Polarity and Phase  (Community Pro Audio)
Why they are different and what their effects are. Lots of graphs.

Assistive Listening Calculator (Acoustic Dimensions)
Interactive Online Tool

Is Sound Quality Important in a House of Worship? And if So, How Do You Achieve It? (Bose)
Free Downloads by: Curt Taipale, professional audio consultant

A Tech’s Wish List for a Quality Sound System (Bose)
Free Downloads by: Curt Taipale, professional audio consultant