Do not filter the modem- as jimbopalmer said, the filters are to keep the phone frequency from interfering with the dsl frequency, not the other way around. The filters should be on anything that is connected to that phone line including fax machines, dial-up modems, satellite receivers, answering machines, caller-ID boxes, and -if still on the same phone line- on the premise including the shop, barn, garage, basement, outhouse, etc, but NOT the dsl!
You might try isolating the noise by unplugging your phones one at a time.
I have run across problems with cheap phones (Dollar General phones, especially) that would amplify the DSL hiss even behind filters and cause havoc with the rest of the system.
There could be different causes for this, but I would suggest you request your telco to install a splitter at your NID or Terminal if you have home-run wiring. This will isolate the wiring that the DSL Modem is on from the rest of the house. If there is a device tied to the same jack that the modem is on, then you will need to filter only that jack.
The filter is designed to block the high frequency hiss caused by the DSL circuit which operates between 125 mhz and 550 mhz. These filters also work great to filter radio noise from the telephone lines.
Nice comment Crowtalks, this is exactly why my ISP company decided this week to only do company installs- no more self-installs causing hours of tech calls, miles of driving AFTER the install and customer complaints. We now only do a filter at the protector with a separate line (where possible) to the dsl modem. So far fantastic results, as of Friday only 4 tech calls left unanswered from a dsl base of 10,000+ customers!
One word: SPLITTER. Filters are a last resort for me. Splitters put the DSL on its own pair, so the only way your problem would persist with a splitter would be if there's x-talk on the pairs. Besides, filters all over the place look awful. One splitter solves it.
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