Quick, before the copyright cops find it: several of the audiobooks are on youtube for your listening pleasure.
Demelza (book 2)
(Jeremy Poldark, book 3, has already been deleted)
Warleggan (book 4)
Black Moon is not available.(book 5)
and then some of the later books, which have Ross and Demelza in them but include a lot of plots about relatives and friends and their kids:
the Four Swans (book 6)
the Angry Tide (book 7)
the Stranger from the Sea (book 8)
the Miller's Dance (book 9)
actually, I have listened or read most of them already, because they are at ScribD....