I just upgraded to dsl and i was told to put microfilters (i think z-filters) on every line not using dsl. well i did that but i still get a small hum/crackel annoying noise. does anyone have this problem?

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Athalon 500
196mb Ram
3D prophet ddr-dvi geforce
SB Live! sound card.
biostar m7mka mobo
20 gig maxtor and 3.5 gig fireball
32x tosheba, and adaptec scsi mitsuia cdr 2x4x
ms internet keyboard pro
ms intellimouse explorer
640k DSL on wintell modem with linksys dsl router
100mbit dlink nic w/wol

Do you have more than one phone line in your house? I read in one of the manuals that the microfilters only work on Line 1, although I couldn't say why that is..