Got it resolved guys! The new Amp was just refusing to sync with the other Wiim devices, so I'd tell anyone in the future to do this if having issues:
-Open App and forget every Wiim device in your app.
-Unplug and kill power to every device.
-Make sure your phone is on the SSID you want the devices to live on.
-Plug in and turn on the new device and add it in the App - get it working and playing.
-Go to next device and follow same steps, until each device is playing.
-Turn the volume on each one up sufficiently loud and resync the audio if needed.
Worked for me ; ) Thanks to everyone for all the help!
