what sort of problems might those be?
i live right in town so i haven't really got any residential neighbours to be stealing bandwidth away from.
the couplers have the word splitter written on them, although one doesn't have a decibel indicator, would that be an actual splitter whereas the other one is merely a coupler?
that could be another thing, i've had to use a 3 way coupler (suppled by ntl) and feed that into a 4 way coupler/splitter (delete as appropriate)