tts level 55

The upper limit of effective quiet has been reported to be as low as 55 dBA (Kryter, 1985, p. kemasan kertas berisi 500 helai tts 256–259) and as high as 65 to 70 dBA (Ward, 1976), with lower limits of effective quiet required for exposures producing greater TTS (Kryter, 1985, p 256–259; Ward, 1976) Cumulative effects of repeated exposure to TTS-producing stimuli have been