Distorted/Clipped audio when record from DVD line out connector

Dear forum,
I'm using a BeagleBoard clone (IGEPv2) to record audio (LINE IN) from
a DVD source. As far I know DVD the board are working at audio line
level -10dB. I've tested diferent kernels and distributions (and
alsamixer configurations) and in all the cases the recorded audio is
distorted / clipped.
Someone with same issue?

Sorry about to put this message here. I'm desesperate!