When you set the volume below 60%, the C1 Pro earbuds' volume is similar to airpod pros', When both volumes were turned up to the maximum, the airpod pros earbuds have a little louder volume, but the difference is not noticeable. Of course, it is also related to the wearing angle of your earbuds and the tightness of the earbuds. Usually, if you wear them tightly, the volume will be louder.