Chime devices have low volume

I bought and had a Pro installed (plus garden camera/floodlight) but the chime box even at full volume is very low, it's not audible from any other room, and even missable if there's something going on like the TV. I bought a chime 2 and installed that upstairs but it's just as low. If you didn't have a phone or the app installed on a PC, you'd miss the ring altogether. Any suggestions on how to increase the internal chime boxes volume?