Stereo balance L / R check
Select L, R, or test both
Speaker test
Free online speaker test in your browser — verify left/right stereo balance, sweep 20 Hz–20 kHz for dead spots or rattling, push sub-bass tones to expose cabinet resonance, and compare in-phase vs out-of-phase wiring. No download; audio plays through your active output device.
Freq sweep 20 Hz – 20 kHz
20 Hz
Sub-bass Rattle check
Phase / polarity Pink noise
In = bass centered. Out = thin, hollow (one speaker inverted).
Placement tips Optimal setup
- Equal distance from listening position
- Tweeters at ear height, angled inward
- Keep away from walls to reduce boom
Online speaker test — stereo, sweep & diagnostics
TestMyGears covers the full speaker test search journey: left/right speaker test for swapped wiring, stereo speaker test audio for balance, frequency sweep for driver faults, and sub-bass tones for port rattle. Browser tests cannot replace a multimeter on bare wire — they validate what your OS actually outputs to headphones, monitors, or phone speakers.
Left / right stereo balance
Full-range frequency sweep
Phase & polarity check
How it works
Three steps to verify your speaker setup with this online speaker test.
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Select a test
Pick stereo balance (L, R, or both), a 20 Hz–20 kHz frequency sweep, sub-bass rattle check (40–100 Hz), or in-phase vs out-of-phase polarity (correlated pink noise). See also: symptom guide .
Tip Use wired headphones first if you need a quiet room — phone and laptop speakers share one cabinet
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Play & listen
Start at low volume, then raise gradually. During L/R tests, sound should localize to the labeled side. On sweeps, note any buzzing, drop-outs, or harsh resonances.
Tip Phone and iPhone speaker tests work, but tiny drivers won't reproduce true sub-bass — expect roll-off below ~120 Hz
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Diagnose issues
Map symptoms to wiring, placement, or hardware limits. Swapped channels need cable fixes; hollow bass often means polarity; rattle at one frequency points to physical resonance. See also: FAQs .
Tip For bare wire or car speakers, a multimeter continuity check complements this browser audio test
What to listen for
Common speaker test symptoms and what they usually mean for stereo setups, monitors, and phone speakers.
Reversed L/R channels
No bass below 80 Hz
Cabinet rattling
Thin, bass-less sound
When should you test speakers?
Practical moments to run a stereo speaker test before buying gear or opening a return.
New speaker or monitor setup
- After unboxing studio monitors or PC speakers, confirm L/R labels match your OS output.
- Run both channel test and phase check before calibrating EQ or room correction.
Desk or room rearrangement
- Moved speakers? Re-test stereo balance — cables often swap when rerouting.
- Sub-bass rattle can appear when enclosures move closer to walls or shelves.
Troubleshooting thin or uneven sound
- One side quiet? Run isolated left and right tests to isolate a dead channel.
- Missing bass with both playing? Phase test beats guessing on wiring polarity.
Phone & tablet speaker check
- iPhone speaker test and Android tests use the same tool — verify earpiece vs bottom speaker if output sounds wrong.
- Expect limited low end; focus on distortion, balance, and crackling at mid volume.
Placement tips for better stereo imaging
Small placement changes often fix imaging problems that look like bad wiring on an L/R test.
Equal distance from listening position
Form an equilateral triangle between your head and the two speakers — typically 1–1.5 m sides for desk monitors. Uneven distance skews the stereo image even when L/R wiring is correct.
Tweeters at ear height, angled inward
Point tweeters toward your ears, not straight across the room. A few degrees of toe-in tightens the center image for music and games.
Keep away from walls to reduce boom
Front-ported or rear-ported speakers can build up bass near walls. Pull speakers forward 30–60 cm if low end sounds boomy after a clean sweep test.
Match volume before comparing channels
OS balance sliders should stay centered during L/R tests. If one side is quieter at the same setting, suspect driver damage or amp channel imbalance — not just panning.
Speaker test FAQs
How do I test left and right speakers?
Click Left or Right in the stereo balance panel. Pink noise pans fully to that speaker. If sound comes from the opposite side, swap speaker cables or check OS balance settings, then re-test.
Is this a free speaker test online?
Yes. TestMyGears runs entirely in your browser — no account, plugin, or download. Audio routes through your current output device (headphones, speakers, or phone speaker).
Does this work as an iPhone speaker test?
Yes on Safari and Chrome for iOS. Use moderate volume; phone drivers emphasize mids and highs, so sub-bass tones may be faint below roughly 120 Hz — that is hardware limitation, not a failed test.
What is a speaker phase test?
Phase test plays the same pink noise in both channels (in-phase) or inverts one channel (out-of-phase). In-phase should sound centered with full bass; out-of-phase sounds hollow and thin — if daily listening matches out-of-phase, flip wiring on one speaker.
Why is there no bass during the sweep?
Small speakers and many laptop drivers roll off below 60–100 Hz. Sub-bass mode targets 40–100 Hz — if you hear nothing, try larger speakers or a subwoofer. Silence on large speakers may indicate high-pass filtering or a missing sub channel.
How is this different from testing speaker wire with a multimeter?
A multimeter checks continuity and resistance on disconnected wire — essential for car audio and bare terminals. This tool tests live audio output: channel mapping, distortion, and frequency response through your DAC, amp, and drivers together.
Can I use this for mic and speaker test together?
This page covers speaker output only. For microphone input verification you need a dedicated mic test (coming to TestMyGears). Run speaker tests first to confirm playback, then test capture separately.
What frequency range does the sweep cover?
The sweep runs logarithmically from 20 Hz to 20 kHz over 20 seconds — the audible range for most music and game audio. Very high frequencies may be inaudible to older ears; very low bass requires capable hardware.
