Alarm sounds low on iPhone 11

Hi Gabmcdan567,

We appreciate you reaching out to us.

We’d like to gather additional details that may help us be in a better position to assist you.

Did you use the same steps below to change your alarm's volume?

1. "Go to Settings > Sounds & Haptics.
2. Under Ringtone and Alert Volume, drag the slider left or right to set the volume. As you drag, an alert will play, so you can hear how the volume changes.
3. Turn on Change with Buttons to use the volume buttons on your device to change the alarm volume."

If yes, are you experiencing the issue on a newly created alarm?

1. "Open the Clock app, then tap the Alarm tab.
2. Tap the Add button .
3. Set a time for the alarm. You can also choose one of these options:
   1. Repeat: Tap to set up a recurring alarm.
   2. Label: Tap to name your alarm.
   3. Sound: Tap to pick a sound that plays when the alarm sounds.
   4. Snooze: Turn on to see a Snooze option when the alarm sounds.
4. Tap Save."

You can use the article below as a reference.

How to set and change alarms on your iPhone - Apple Support

If you haven't, please make sure that you are running the latest version of iOS.

While it isn't inherently assured that an update will resolve the issue, updating to the latest software version for your device can help isolate potential software issues. 

Kindly secure a backup and update.

1. How to back up your iPhone, iPad, and iPod touch
2. Update your iPhone, iPad, or iPod touch

Take care!