Acoustics

Complete the crossword, then click "Check Answers". If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to begin the crossword. Note that two-word answers exist too.
  1          2        
         3         
4                  
                
      5            
                
 6        7           
              8    
9                  
                
       10           
                
                
   11               
                
12             13