Why is the default volume much higher when using the Type-C audio cable or 3.5mm Aux-In cable compared to Bluetooth?

Wired audio does not support absolute volume control. To ensure maximum output gain on the headphones, the wired audio default volume is set to 100%. After connecting with a wired cable, you need to manually adjust the volume to a comfortable level. Bluetooth audio supports absolute volume control, allowing quicker volume adjustments, so its default volume is set around 50%. You can also adjust the volume using the headphones’ roller or the device’s volume buttons to find your preferred level. Reast assured that this design is consistent across other brands of over-ear headphones and is not a defect.