I don't want to do the rewiring required to put a splitter at the demarcation point, but we don't have DSL micro filters available here. Can I use two splitters as filters for the modem and the phone?
@Edit:
I think the Wikipedia article clearly answers this question:
Typical installation for an existing home involves installing DSL filters on every telephone, fax machine, voiceband modem, and other voiceband device in the home, leaving the DSL modem as the only unfiltered device.