In Phase = centered. Out of Phase = hollow, diffused.
Speaker test guide
Verify your speaker setup is working correctly — test stereo balance, frequency response, and phase polarity right in your browser.
Full-Range Sweep
Test your speakers across the entire 20Hz–20kHz audible range. Identify dead spots, rattling, or roll-off at frequency extremes.
Phase & Polarity
Detect reversed speaker wiring instantly. Out-of-phase speakers cause bass cancellation and a hollow, unfocused soundstage.
Sub-bass Detection
Push your speakers with low-frequency tones (20–100Hz) to reveal cabinet resonance, port noise, or driver distortion.
When Should You
Test Your Speakers?
New Speaker Setup
After unboxing and wiring new speakers, run the L/R and phase tests to confirm everything is connected properly.
Room Rearrangement
Moved your desk or furniture? Re-test stereo balance and sub-bass to ensure optimal acoustic performance in the new layout.
Troubleshooting Audio Issues
Hearing unbalanced sound, no bass, or distortion? The frequency sweep and phase test can quickly pinpoint the problem.
Home Theater Calibration
Verify each channel of your surround setup independently before running more advanced calibration software.
How It Works
Three simple steps to verify your speaker setup.
Select a Test
Choose from L/R stereo balance, frequency sweep, phase polarity check, or sub-bass rattle detection. Each test is designed to evaluate a specific aspect of your speaker performance.
Play & Listen
Click play and listen from your normal seating position. For the L/R test, confirm sound comes from the correct speaker. For the sweep, note any buzzing, rattling, or silent frequency ranges.
Diagnose Issues
Use the results to identify problems — reversed wiring, damaged drivers, cabinet resonance, or placement issues. See our troubleshooting guide below for detailed interpretation.
What to Listen For
Common symptoms and what they mean for your speakers.
Reversed L/R Channels
If the left speaker plays when you click "R" (and vice versa), your speaker cables are swapped. Simply switch the left and right cables at your amplifier or audio interface.
No Bass Below 80Hz
Small bookshelf speakers and laptop speakers physically cannot reproduce deep bass. This is normal — not a defect. Consider adding a subwoofer for the 20–80Hz range.
Cabinet Rattling
Buzzing during the sub-bass test usually means loose screws, a vibrating port tube, or nearby objects resonating. Tighten all screws and clear objects from the speaker surface.
Thin, Bass-less Sound
If the "Out of Phase" and "In Phase" tests sound identical, one speaker likely has reversed polarity. Swap the + and − wires on ONE speaker to fix this.
Frequently Asked Questions
Q.How do I know if my speakers are wired correctly?
Run the L/R channel test. If the left speaker plays when you click "L" and the right plays for "R", your wiring is correct. If reversed, swap the speaker cables at the amplifier or speaker terminals.
Q.What does the phase test check?
It checks if both speakers are pushing and pulling air in sync. Out-of-phase speakers (one wired backward) will severely reduce bass and create a thin, unfocused sound. The fix is usually swapping the + and − wires on one speaker.
Q.Why can't I hear the sub-bass frequencies?
Most laptop and small desktop speakers cannot reproduce frequencies below 80–100Hz. If you don't hear anything below 60Hz, your speakers likely lack the driver size needed for deep bass. Try using a subwoofer or larger speakers.
Q.Does the speaker test work on mobile devices?
Yes, it works on any device with a modern browser. However, phone and tablet speakers have very limited frequency range — they're best for basic L/R verification rather than full-range testing.
Q.How should I position my speakers for the best stereo imaging?
Place speakers at equal distance from your listening position, forming an equilateral triangle. Angle them inward so the tweeters point toward your ears. Keep them at least 12 inches from walls to reduce bass buildup.
Q.Can I use this test for a surround sound system?
The L/R test verifies your front stereo pair. For full 5.1 or 7.1 surround testing, you'll need to test additional channels. Our upcoming Surround Sound Test tool will support multi-channel setups.