The CXN (V2) currently supports the following formats:
WAV containing uncompressed PCM 16-24 bit, 32-192kHz
Apple Lossless (ALAC) containing uncompressed PCM 16-24 bit, 32-192kHz
FLAC containing losslessly compressed PCM 16-24 bit/ 32-192kHz
AIFF containing uncompressed PCM 16-24 bit, 32-192kHz
WMA
MP3
MPEG-4
AAC-HE
AAC
AAC+
OGG Vorbis
DSD64