Cox panoramic wifi modem/router noise

I've exchanged my Panoramic system a couple times now, and the noise in each system is unbearable. I can hear it across the house and have to unplug it at night if it's anywhere near the bedroom.

Is it possible to buy my own modem and replace this one entirely? Suggestions on a reliable compatible router and modem? (Or whatever I need to get the existing unit out of my house)?