Surround Sound Test – 5.1 & 7.1 Channel Check
5.1 and 7.1 channelsSee how many output channels your browser can address.
- 5.1: FL · FR · C · LFE · SL · SR
- 7.1: adds Rear L and Rear R
- LFE plays a 50 Hz tone
- Windows: Sound → device → Configure
- macOS: Audio MIDI Setup → Speakers
- HDMI: set the TV or AVR to multichannel
- Under 6 channels, rears are panned
- Start quietly before each channel
- Nothing is uploaded
Surround Sound Test (5.1 & 7.1)
Play each surround channel one at a time to confirm your home-theatre speakers are connected, placed and configured correctly.
5.1 & 7.1 Layouts
Play each channel on its own: front, centre, surround, rear and LFE.
Channel Detection
See how many discrete outputs your browser can reach on this device.
Stereo Fallback
On stereo devices, rear and centre channels are simulated with panning.
How to
Test Surround Sound
- 01
Connect to your receiver via HDMI and set the OS output to 5.1 or 7.1
- 02
Click Detect channels to confirm 6 or 8 outputs
- 03
Click each channel and confirm the right speaker plays
- 04
Play LFE and check the subwoofer responds
5.1 vs 7.1 speaker layouts
| Channel | 5.1 position | 7.1 position |
|---|---|---|
| Front L/R | ±22–30° | ±22–30° |
| Center | 0° | 0° |
| LFE | Anywhere | Anywhere |
| Surround L/R | ±110–120° | ±90–110° (sides) |
| Rear L/R | n/a | ±135–150° |
Channel order follows the standard layout: FL, FR, C, LFE, SL, SR, RL, RR.
The honest surround story: browsers and multichannel
Browsers can send discrete channels only if the OS exposes a multichannel device. Windows: Sound settings → HDMI/receiver device → Configure → 5.1 or 7.1. macOS: Audio MIDI Setup → Configure Speakers. Laptops, Bluetooth headphones and TV speakers usually expose 2 channels; the test then falls back to stereo panning, which simulates position. Dolby Atmos/DTS:X height channels can't be tested from a browser.
Common surround problems
Rear channels silent
Confirm the OS is set to 5.1/7.1, the receiver isn't in a stereo mode, and surrounds are enabled in the speaker setup.
Center plays from left and right
The receiver is set to “no center”, or the output is stereo (phantom center).
Sides and rears swapped
Receivers label side terminals “Surround” and rear ones “Surround Back”. Swap the pairs.
Subwoofer silent
Check the LFE cable, sub power/auto-standby and that the receiver has the sub enabled.
Related guides and fixes
Learn more in these guides: No sound on Windows, No sound on Mac, Headphones only one side, Speakers crackling, How to test speakers, How to test headphones.
Calibrating levels
After confirming channels, run your receiver's auto-calibration (Audyssey, YPAO, Dirac), or match levels at the seat with a decibel meter.
Surround on headphones
Stereo headphones have two drivers, so they can't play discrete 5.1. Virtual surround (Windows Sonic, Dolby Atmos for Headphones) simulates direction with HRTF processing. On 2-channel outputs this page uses panned noise for a basic left/right check.
Interpreting results
Auto-rotation
Playing each channel in sequence makes swapped speakers obvious.
Front and back on headphones
Virtual surround in headphones is weak; front/back confusion is normal.
Spatial audio
Complete guide to surround and spatial audio
Check channels one by one, verify the decoder, then test with content.
When a surround test fails
Rear or side channels weak or silent
Check the receiver's speaker configuration (speakers set to "None" receive no signal), cables at both ends, and the channel level trims. Then make sure the source is actually sending multichannel audio: browsers and many TVs output only stereo unless the system exposes 5.1 or 7.1 channels.
Rears sound like they are in front
On speakers, the rear channels may be wired to the front terminals or the receiver is upmixing stereo. On headphones, virtual surround cannot reproduce rear positions reliably; front/back confusion is normal.
When to consider upgrading your surround system
Upgrade when a test shows a limit you notice in real use: dialogue that is hard to follow (a better centre speaker helps most), weak bass in films (add or upgrade a subwoofer), or a receiver that cannot decode the formats your sources provide.
Surround test on a home theatre, soundbar or TV
Connect your laptop or phone to the TV or receiver by HDMI. On Windows, open Sound settings → your HDMI device → Configure and choose 5.1 or 7.1 if available. Many soundbars and Android TVs accept only stereo from a browser, so the rear channels may stay silent here even though they work with films. In that case, use the soundbar's own test tone from its remote or app to check the rear speakers.
Frequently Asked Questions
Q.Can I test 5.1 surround in a browser?
Yes, if the OS output is configured for 5.1/7.1 (usually HDMI to a receiver). Otherwise it falls back to stereo.
Q.Why does it say only 2 channels?
Your output is set to stereo. Change the speaker configuration in OS settings.
Q.Which channel is LFE?
The fourth channel (FL, FR, C, LFE…). It feeds the subwoofer.
Q.What's the difference between 5.1 and 7.1?
7.1 adds a separate rear pair behind the listener.
Q.Can I test Dolby Atmos height speakers?
No. Use your receiver's built-in test tones.
Q.Why does the rear sound come from the front?
Wrong terminals or receiver downmixing. Check the speaker assignment.
Q.Does this work in a console browser?
Console browsers usually output stereo; use the console's audio setup test.
Q.Do I need special files?
No. Signals are generated live in the browser.