Recently I was looking to buy a good computer speakers and was wondering how to test the sound. Then I found these:

• Bassotronics – Bass, I Love You
  [audio:http://blog.anichin.com/wp-content/uploads/2010/11/bass.mp3]
• The Science Of Sound (Low Frequency Audio Test)
  [audio:http://blog.anichin.com/wp-content/uploads/2010/11/The_Science_Of_Sound.mp3]
• Trial of Seconds (Musical Composite Track for SPL)
  [audio:http://blog.anichin.com/wp-content/uploads/2010/11/Trial_of_Seconds.mp3]