With my new DSL internet service, I installed the microfilters provided for my phones. The internet is working just fine. However, a Sanyo cordless phone now has low audio. I tried 3 filters in line and very little improvement. I installed 2 filters but back to back i.e. the 2 filters are connected together using the ports that should normally go to the phone. Then the 2 pig-tails on the filters are connected, one to the LINE and the other to the phone. This gave some improvement - useable. I"m trying to understand why the low audio.
My other 2 phones (one a REAL phone with transformer, ringer, and no electronics) work just fine.
Some ideas is that the simple electronic transformer core is saturated (higher line current) but I don't know if the DSL signal is adding more current. Or something to do with the impedance matching. Might a more expensive microfilter do the job? If I'm going to spend $15 on a filter, I might as well buy a new phone.
When I disconnect the DSL modem, the audio goes back to normal.
Internet service and modem is from Sympatico.ca (Ontario, Canada).