# How to analyze a large wav file?

I have a large wav file (100 Mb). Any operation on it is time consuming. For example, to Import it takes about 1-2 minutes.

The next step seems to be to figure out how it is encoded, since WAV files can be encoded in a lot of different ways. How can I determine the encoding? I tried using Take, but I found no meta information:

Note that every operation is taking a long time here, so I am hoping to figure out how to do this fast.

{encod,sound,data} = Import["ExampleData/rule30.wav",{{"AudioEncoding","Sound","Data"}}];