I am running MPC and send all audio to SPDIF where my receiver decodes it.
In the past I used Haali but now all works fine. Is Haali still important to use?
should one use Haali renderer?
haali is just a media splitter, it allows windows to open the .mkv container. but i,m not sure is a program like MPC has a built in splitter, if you can open mkvs then you dont need it...or you already have it.
MPC-HC has its own mkv splitter so in that sense you don't need Haali. The only time I've found myself needing haali is when using eac3to to rip a blu-ray (when you specify the video track output file as an mkv file). So, I have it installed on my htpc.