How it works
For uncorrelated sources with the same reference, combined level = 10 log₁₀(10^(L₁/10)+10^(L₂/10)).
Input definitions
- First level (dB)
- Enter the value in the labeled unit.
- Second level (dB)
- Enter the value in the labeled unit.
A worked example
- First level (dB)
- 60
- Second level (dB)
- 60
Assumptions & limits
Ideal educational model in the stated SI units. Real equipment, structural design and safety decisions need appropriate professional analysis; losses are excluded unless entered.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-18. Content checked against the stated method and examples. Our verification approach.
Common questions
Why do two equal levels add about 3 dB?
Their intensities double, and 10 log₁₀(2) is about 3.0103 dB. Coherent signals can interfere and require phase information.
How does Combine independent sound levels work?
For uncorrelated sources with the same reference, combined level = 10 log₁₀(10^(L₁/10)+10^(L₂/10)).
What should I check before using Combine independent sound levels?
Ideal educational model in the stated SI units. Real equipment, structural design and safety decisions need appropriate professional analysis; losses are excluded unless entered.