I would say that if you used an adsl filter before you need to use it in this setup as well. ADSL filter into the wall. Modem socket on the adsl filter to the modem and then plug that box into the "telephone" socket on the adsl filter. That box is basically just a sophisticated splitter by the look of it so it won't be setup to deal with filtering the adsl signals.
Oh, and you TRUSTED a pc world person?!!?! Fail! lol!
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