If you mean if the series is available in audio format (i.e. an unabridged reading of the novels) then no. The series is not available in audio in the English-language markets. At least not yet. There have been hints that that might be about to change in the near future but there are no details available as yet.
However, there is a German radioplay based on all four novels novels which is out on CD/mps, but, alas, only in Germany and, of course, only in German.