Assuming you have the latest firmware, the EQ is saved on the TW2 adapters themselves, not in the app, which is why it doesn't work wired. This means your EQ will still be applied even if you dont open the app or if you pair the TW2 with a device that doesnt even have the app installed. Also, if you change phones, you will be able to see the same settings on your TW2 using the app on that other phone and change such settings using any device with the app installed on it (including your custom EQ settings). The app is for the Shure bluetooth devices only and, in my opinion, actually works really well. Have used it with my TW2 and Aonic 50, which unfortunately broke yesterday (very sad). What I really like about the TW2 is that everything seems well thought out and implemented and it seems to just work as intended.