432hz is the natural "musical pitch" in the universe, as opposed to 440hz, which is the standard in music nowadays. Research shows that music in 432hz, in according to the majority of the music lovers, is nicer for hearing, softer, brighter and more beautiful than music in 440hz.
432hz gives a greater clarity than 440hz, there's less need to play music in 432hz as loud as in 440hz. This means less hearing damage, as long as you put the volume not too high. It's known that, for example, 90 dB gives hearing damage after 8 hours. Further there's also less noise pressure with 432hz.
432hz is more favorable for the chakras too. 440hz is working at the third eye chakra, "the thinking", while 432hz is working at the heart chakra, "the feeling". Listening to music in 432hz therefore accelerates the spiritual development of the music lover, although the tempo is for everyone different.