Source: Evangelion 2.22 Blu-ray
Audio: 6.1 DTS-ES
Decoded with: libavcodec    52.96. 0 / 52.96. 0
Encoded with: 4.60.1 (-hh -x6)

The wavs were produced as follows:

ffmpeg -i eva_2.22_6.1_16bit.dts -acodec pcm_s24le eva_2.22_6.1_24bit.wav (yes this is false 24-bit, but that isn't the point)
ffmpeg -i eva_2.22_6.1_16bit.dts -acodec pcm_s16le eva_2.22_6.1_16bit.wav