1. 
   dB(A)
   The human ear does not hear all frequencies with the same intensity. It is most sensitive to sounds in the 500Hz-8kHz range. Above and below this range the ear becomes progressively less sensitive. To compensate for this, sound level meters incorporate electronic filtering to correspond with the var...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   dB(A)
   Decibels (A-weighting).
   Found op http://www.encyclo.co.uk/local/20474
   
   
3. 
   dB(A)
   A sound-level meter reading with an A-weighting network simulating the human-ear response at a loudness level of 40 phons.Enter frequency and level in either dB or dB(A) to get conversion and weighting or frequency only to get weighting.
   Found op http://www.diracdelta.co.uk/science/source/d/b/dba/source.html
   
   
4. 
   dB(A)
   The human ear is more sensitive to sound in the frequency range 1 kHz to 4 kHz than to sound at very low or high frequencies. Therefore, sound meters are normally fitted with filters adapting the measured sound response to the human ear.
   Found op http://www.wind-energy-the-facts.org/en/glossary.html
   
   
5. 
   dB(A)
   Sound volume, as perceived by humans, is dependent on the pitch of the sound. A sound reading shown as dB(A), or dBA, indicates that the scale is adjusted to match human perception. The dB(A) scale adjusts absolute dB readings of sound levels from very low frequency sounds, infrasound, downward beca...
   Found op http://ramblingsdc.net/Australia/WpGlossary.html
   
   

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