Intervideo AC3 <> AC3 Filter [see item (6) of my Help2Help-post (link at bottom)].
To access AC3 filter's settings from BSPlayer (with videofile loaded) follow:
(rightclick >) Options > Filters > Advanced
(for general setting purposes you can also access it directly through
[Start] > Program files > AC3Filter > AC3Filter Config)
Further check out these threads:
one,
two,
three.