Ruggie's speakers can generate really loud sounds, ranging from 90-120 decibels. This is a design feature, because Ruggie's job is to get users out of bed. It creates the urgency to jump out of bed and stop the alarm.
But what if I want to lower the volume?
Unfortunately this current version of Ruggie you cannot lower the volume within it's settings. But if you simply tape over the speaker holes, it will lower the volume by at-least 50%