According to Brain T. Collins, a musician and researcher, the standard pitch (A=440 Hz) does not harmonize on any level that corresponds to cosmic movement, rhythm, or natural vibration. The greatest musicians, such as Mozart and Verdi, based their music on the natural vibration of A=432
432 Hz seems to work at the heart chakra, "the feeling", and therefore could have a good influence on the spiritual development of the listener.
Because 432 Hz gives a greater clarity than 440 Hz, there's less need to play it as loud as 440 Hz. This means less hearing damage, as long as you put the volume not too high. Furthermore there's also less noise pressure.
432Hz is based in nature and therefore it generates healthy effects among the listeners. Hope you enjoy!