Elmedia Player offers good support for MKA files and gets good reviews.
Elmedia Player will easily become your top free MKA player for Mac and will work great on the latest macOS Sierra. Follow the easy steps to play MKA files on Mac easily and smoothly.
First off free Elmedia supports multiple other file formats, including uncommon ones. Also you have the possibility to not just play MKA files on your Mac, but with Elmedia Player PRO you get to download MKA files from the web and save them on the hard drive.