Two controls affect what you hear
This player’s Volume slider changes software gain. Your phone, computer or speaker has another volume control. Bluetooth output and a different speaker can change the result even when the on-screen percentage stays the same.
The player starts at 10% after a reload and does not restore a higher master setting. This is a conservative interface choice, not a measured safe level at a baby’s ear.
Before pressing Play
- Confirm which device will play sound, especially after connecting Bluetooth or changing speakers.
- Lower the device output and keep the browser slider low before starting. Check the result yourself before using it as a background.
- Place the device and cables away from the sleep space. Do not put a phone or speaker in a crib.
- Choose a short timer and stop if sound is unwelcome. Avoid increasing level merely to recover bass on a small speaker.
Percentages, decibels and measurement
A volume percentage does not convert directly to dBA. The website has no microphone access, sound-level meter or calibration for your speaker and room. It cannot verify the level at a baby’s head.
An uncalibrated phone-meter reading should not be treated as a safety certificate. For a specific hearing or exposure concern, ask a qualified clinician or hearing professional about an appropriate measurement and setup.
Why you may see “50 dB” elsewhere
The 2014 machine study cited a hospital-nursery limit of 50 dBA when interpreting measured device output. It also discussed adult occupational exposure limits for some high outputs. Neither is a universal instruction for setting a home browser player.
The AAP’s practical guidance emphasizes distance from the baby’s head, shorter use and reducing noise exposure. This page avoids inventing a safe percentage or a single distance that fits all devices.
Source: Hugh et al., 2014: study methods and reference levels · AAP: noise guidance for families
Sources and limits
These sources support the factual explanations. They do not endorse this site or certify a particular playback setup.
Sources checked October 10, 2026. Written for this project; no clinical review is claimed.