Explore the Sound Waves: Two Speakers & Interference
Play a note through two speakers, drag a listener around the room and find the loud and silent spots. Free, no signup, runs in your browser.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
See it in action
The Sound Waves: Two Speakers & Interference with sample data entered and the result showing.
What is the Sound Waves: Two Speakers & Interference?
Play a note through two speakers, drag a listener around the room and find the loud and silent spots. It runs in your browser, so a change to a setting or a drag on an object shows up at once.
Concert halls, speaker placement, noise cancellation and radar all use wave interference.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Two waves add where they arrive in step (loud).
They cancel where they arrive half a wavelength apart (silent).
Path difference decides what you hear.
Move the listener along a line and find the quiet spots.
Change the second speaker to out of phase.
Raise the frequency and see the pattern get finer.
Used for
Pick one to see how it fits.
Physics learners
Physics students in middle school, high school and first-year university, teachers who want a quick demonstration for the projector, and anyone revising for exams.
Try it freeTeachers
For teachers: project the Sound Waves: Two Speakers & Interference on the board, let students predict the result, then run it together and test this: Change the second speaker to out of phase. For students: change one thing at a time and write down what changes.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This simulation | Textbook diagram | |
|---|---|---|
| Interactive | Drag, tap and change settings | Fixed picture |
| Install | Nothing to install | Not needed |
| Cost | Free to use | Depends on the book |
Questions people ask
What is destructive interference?
When two waves meet with a crest of one on a trough of the other, so they cancel.
How is wavelength found from frequency?
λ = speed of sound ÷ frequency, about 343 m/s ÷ f in air.
Is the Sound Waves: Two Speakers & Interference free to use?
Yes. The Sound Waves: Two Speakers & Interference is free, needs no signup or download and runs in your web browser. It is part of the Physics group of AZRS simulations.
Does the Sound Waves: Two Speakers & Interference work on a phone or tablet?
Yes. The Sound Waves: Two Speakers & Interference takes touch input as well as mouse input, so you can use its 4 adjustable settings with a finger. A larger screen makes the controls and graphs easier to read.
How do I use the Sound Waves: Two Speakers & Interference?
1. In the Sound Waves: Two Speakers & Interference, use the controls to change Frequency, Speaker separation, Second speaker, Colours. The simulation reacts instantly. 2. In the Sound Waves: Two Speakers & Interference, pick an option such as In phase, Out of phase, Off, Red / blue to switch modes or load an example. 3. Start with this experiment: Move the listener along a line and find the quiet spots. Drag any glowing handle, object or slider with your mouse or finger and the Sound Waves: Two Speakers & Interference responds in real time. 4. Change one setting at a time and watch which readout moves, then compare it with this idea: Two waves add where they arrive in step (loud).
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Try the Sound Waves: Two Speakers & Interference now
Play a note through two speakers, drag a listener around the room and find the loud and. Free to use.
Try it free