said by kmand 
:A lot has changed in 10 years. The Cable company has changed hands a few times and is now Comcast, and a lot of engineering changes have been made in the system. On the TV side of my split I added a bidirectional amplifier since I now have a lot of active taps including some bidirectional cable boxes and the signal level was too low with all the splitting. The filter sits right at the first split before the amplifier.
I don't know if the filter was ever needed, and if its helping or hurting anything now. I'm inclined to remove it just to have one less item in line with what is already too many items on one side of the split. I guess in theory an upstream filter shouldn't cause any loss on the downstream side, but thats in theory. Is removing it a bad idea?
Removing it is a bad idea. If you have a bi-directional amp in-line because you have added several more outlets yourself inside chances are you have alot of ingress in your CONDO and if you remove the filter you will amplify the ingress problem back out onto the plant and cause problems for all.
