Speaker SPL at Distance Calculator
Fill in the values and the answer updates as you type.
How the Speaker SPL at Distance Calculator works
Level at 1 m = sensitivity + 10 × log₁₀(watts). Each doubling of distance then costs about 6 dB in open space (inverse-square law). Rooms add reflections that make real levels higher than this free-field estimate, and sensitivity ratings vary with frequency, so treat the result as a planning figure. Example: with Speaker sensitivity (1 W at 1 m) 90 dB, Amplifier power 50 W, and Listening distance 3 m, the result is Level at listening position (dB SPL) = 97.4; Level at 1 m (dB SPL) = 107; Loss from distance (dB) = 9.5.
Inputs and results
The Speaker SPL at Distance Calculator takes 3 inputs and gives 3 results.
What you enter
- Speaker sensitivity (1 W at 1 m) (dB) — starts at 90.
- Amplifier power (W) — starts at 50.
- Listening distance (m) — starts at 3.
What you get
- Level at listening position (dB SPL)
- Level at 1 m (dB SPL)
- Loss from distance (dB)
Example: Speaker SPL at Distance Calculator with the starting values
With speaker sensitivity (1 w at 1 m) 90 dB, amplifier power 50 W and listening distance 3 m, the calculator returns:
| Level at listening position (dB SPL) | 97.4 |
|---|---|
| Level at 1 m (dB SPL) | 107 |
| Loss from distance (dB) | 9.5 |
Change any value above and the results update straight away.
Speaker SPL at Distance Calculator FAQ
How do I use the Speaker SPL at Distance Calculator?
Enter speaker sensitivity (1 w at 1 m), amplifier power and listening distance in the fields, then read level at listening position (db spl), level at 1 m (db spl) and loss from distance (db) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Speaker SPL at Distance Calculator calculate?
Sound level at your listening position from speaker sensitivity and power. It returns level at listening position (db spl), level at 1 m (db spl) and loss from distance (db) from the 3 values you provide.
What values does the Speaker SPL at Distance Calculator start with?
It opens with speaker sensitivity (1 w at 1 m) 90 dB, amplifier power 50 W and listening distance 3 m so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Speaker SPL at Distance Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Speaker SPL at Distance Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.