Jack and Vox is a very good combo, I found Jack a bit cumbersome to configure- especially the routing pane (and Vox runs without Jack installed) as well.
There is a very good App for loopback config:
If you find it not good enough launch the .pkg installer again or if you deleted it redownload from https://rogueamoeba.com/loopback/download.php
- Launch the pkg, but choose the “Uninstall…” command from the menu.
- Follow the prompts to uninstall, quit the app when finished.
- Now, to finish removing Loopback, Trash the App and empty the bin.
Whats cool about it is the ease of use and per-application config which I found out is better then global after a short time using Jack.
You can loopback audio from 2.1/2.0 sources to 5.1, 7.1 etc- by combining channels together for subwoofer or center ;) it's not Pro Logic X- but I found it good enough.
warning: After 15 min it will add's (a very annoying solution from the dev's- need to write them about it) white noise to the output, you
need to re-enable or buy it (10$) to disable this, but it will give you enough time to test. A lot can be done and re-configured with HALLab and AULab, on the other hand 10$ is fair enough for loopback, it's works well (with some UX weirdness)- but if you dont want to spend x hours- fiddling go for it. HAL/AUL can make the user angry if you dont know it.
How to config Spotify 2.0 to 5.1 for USB:
For super extra config powers you need:
Apple's HLLab and AULab
Both applications are available from https://developer.apple.com,
if you are already logged in, you can grab them from here directly
The dmg file is available as download for all accounts, after log-in with your apple id (works for non-developer subscriptions as well)
HALLab gives you a lot of configuration options and, for example, check the Streams tab, (after selecting Info)- you can tune the frequency upwards, and change your channel layout :)
Audio Units Lab allows even more you can build your dts mixers and add/remove them in whatever configuration you like:
If you spend some time with those 2 utils you will be initially very angry, but after finding out how all of it sticks together you probably uninstall loopback before the trial is over. You need some time to read and check configs- there is a lot.
I don't have enough desktop room to add to show more, but you can do a
lot with filters, enough for days to fiddle with your audio. Let me know whats working for you. Cool name btw, got the same.
Hope this can solve your problem.