I installed the POE filter inline with the main incoming line right at the bidirectional amplifier (on input line.) It's in my electrical closet, but there's no splitter before this.
When I did this, both my TiVo Roamio and my X1 box lost connections. My TiVo Mini still communicated to my Roamio and I was able to play recorded show (as expected since the POE filter is outside of the loop.)
Any know issues w/ POE Filters on Comcast systems or with Bidirectional Amps? Or do I potentially have a dead POE Filter. In my old job, I'd just take it to work and hook it up to a Signal Generator and Spectrum Analyzer but I don't have the luxury in my new job