A new iPhone and iPad setting gives you control over how loud your device's built-in speakers get, which can help you avoid being startled by loud auto-playing videos, waking up someone sleeping nearby, hurting your ears, or degrading your speakers' quality and performance. You could already reduce loud audio levels for AirPods and other headphones via the Headphone Safety feature, where you set a decibels threshold to automatically protect your hearing from any levels above the limit. But wi...