Android
Default Alarm Sound auf Android
Android stores one system-wide value for the default alarm sound. Every time you create a new alarm in the Clock app, that value gets used unless you manually pick a different tone for that specific alarm.
This setting lives under sound options, separate from your ringtone and notification sound. Changing it here does not touch alarms you already saved with a custom tone, it only affects new alarms and any alarm still set to the default.
You can choose from the preinstalled tones or pick a song from your own music library. If you select a personal audio file, keep in mind it stays tied to that file's location on your device, so moving or deleting the file later can silently reset the alarm back to a system tone.
To change it, open the path below:
Open the settings ➔ Tap on Sounds ➔ Tap on Advanced ➔ Tap on Default alarm sound ➔ Confirm with Just once ➔ Choose an alarm tone and confirm with OK
If a single alarm sounds wrong but the rest are fine, edit that alarm directly in the Clock app instead of changing this system-wide default.