AUDIBLE FREQUENCY RANGES 627 



4. The quality of reproduction of orchestral music continued to im- 

 prove materially as the lower cut-off was extended to about 80 cycles 

 and the upper cut-off to about 8000 cycles. Reproduction of the full 

 audible range was preferred to any limitation of band width. 



5. Noises required reproduction of the highest audible frequencies. 

 A 10,000 cycle cut-off caused appreciable reduction of naturalness on 

 common noises. It was felt that this cut-off probably would never pre- 

 clude recognition of a noise. 



The results seem to necessitate no radical revision of the qualitative 

 ideas entertained by many acoustical engineers for some years, their 

 value lying rather in the quantitative corroboration they supply. 



