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Audio Engineering Society – http://www.aes.org/

Hardigg Military Cases – http://www.militarycases.com/

National System Contracting Society – http://www.nsca.org/

Infocomm – Audio Visual Trade Show – http://infocomm.org/

“Pro Audio” on Wikipedia

“Loudspeaker” on Wikipedia

Mp3 Description / reference:  (from Wikipedia entry at http://en.wikipedia.org/wiki/MP3 )

The simplest type of MP3 file uses one bit rate for the entire file — this is known as Constant Bit Rate (CBR) encoding. Using a constant bit rate makes encoding simpler and faster. However, it is also possible to create files where the bit rate changes throughout the file. These are known as Variable Bit Rate (VBR) files. The idea behind this is that, in any piece of audio, some parts will be much easier to compress, such as silence or music containing only a few instruments, while others will be more difficult to compress. So, the overall quality of the file may be increased by using a lower bit rate for the less complex passages and a higher one for the more complex parts. With some encoders, it is possible to specify a given quality, and the encoder will vary the bit rate accordingly. Users who know a particular “quality setting” that is transparent to their ears can use this value when encoding all of their music, and not need to worry about performing personal listening tests on each piece of music to determine the correct bit rate.

Perceived quality can be influenced by listening environment (ambient noise), listener attention, and listener training and in most cases by listener audio equipment (such as sound cards, speakers and headphones).

A test given to new students by Stanford University Music Professor Jonathan Berger showed that student preference for MP3 quality music has risen each year. Berger said the students seem to prefer the ‘sizzle’ sounds that MP3s bring to music.[44] Others have reached the same conclusion, and some record producers have begun to mix music specifically to be heard on iPods and mobile phones.[45]

Free Rock Mp3s, Rock Music Download from California – Too late for Roses

New California Mountain Surf Music from Wadsworth Bluff Rats

Instarmusic.com – new rock mp3s, free mp3 music from California

TLFR on Facebook – free mp3s and album downloads