Not the same thing. This is a forum for audio. They could have forums for every sub-genre of music, as well. However, they have one forum for "Music" and let people create threads for the genres/artists they want to talk about. Having CD players mixed in with other digital sources is in the same vein. I like Frank Sinatra, on SFF they have a forum specifically for Frank's music. They don't have that on Audiokarma and I would not expect them to have forums based on enthusiasm because it would be hard to tell the enthusiasm for something before you create the forum.
They could stick CD players in a subforum, which would make as much sense as having one for PC music (though, PC require a lot more time and process as part of the regular setup), so I would not be completely opposed to that concept. I just think it is overkill for the medium. I have a lot of enthusiasm for Airplay, maybe they need a subforum for it and Chromecast Audio has a lot of enthusiasm, maybe a forum for that, as well?
Heck, the iPhone is probably the most used audio device on the planet, maybe it deserves a forum and maybe one for Samsung, as well? Also, they have PC forum, but what about enthusiasm for Macs vs PCs. Maybe Macs deserve to be put in their own sub-forum? It goes on and on and on....