Fix/workaround for iPhone music equalizer settings on Homepod
This is not a question, but a workaround to force homepods to use your iPhone EQ settings.
The reason the iOS EQ setting does not apply to the homepod when using Apple Music is because the iOS app is only a controller for the homepod, it does not actually transmit audio over wifi to your homepods..... unless the homepod can't connect to Apple.
If you're willing to give up Siri and the other internet required features then blocking the homepod(s) internet will force the audio to stream from your phone over wifi to the homepods, thus allowing the iPhone EQ setting to work.
After you do this, in order to get it to work, you need to airplay from something NOT apple music(spotify, google play, etc), then while that is playing, switch to apple music app and press play. It will immediately take over the homepod audio with EQ fully functional.
Now I also had the bright idea to just block the specific IPs for apple music, but when I tried this, the homepods thought they were still connected and still try to stream. Unfortunately it seems you have to completely block them from all internet access for this to work.
Note this also means your phone must stay available on wifi for music to continue. The point of homepods streaming directly from cloud is so that your phone can die or you can walk out of wifi range and they keep playing. Sadly that feature also breaks EQ. But since I need EQ more than I need homepods to work without my phone present, I'm willing to give it up.
I have a linksys router, and I was able to go turn on the parental controls, the actual steps to block them are going to depend on what router you have.