sometimes the filters work, but most of the time they dont. If they do, most will hinder the performance of the bass in your system, the way they are designed, the signal has to "jump" across a couple of windings (like an ignition coil). Which is fine for higher frequencies, but as the frequencies drop, its harder for them to "jump" the gap.
-There are 10 kinds of people. Those who understand binary, and those who do not.
-If we ever forget that we are One Nation Under God, then we will be a nation gone under...Ronald Reagan