# AudioTestHQ (audiotesthq.com)

> Free browser-based audio tests: speakers, left/right stereo, headphones, microphone, bass, 5.1/7.1 surround, speaker polarity and measured audio latency. Everything runs locally in the browser; no audio is uploaded. Developed and maintained by Sri Murugan Systems.

## Tests and guides
- [Audio & Sound Test: Speakers, Headphones, Mic](https://audiotesthq.com/): Free online audio and sound test: check left and right speakers, headphones, bass and your microphone in the browser. Get a result card. Nothing is uploaded.
- [Left Right Sound Test: Stereo Speaker Check](https://audiotesthq.com/left-right-test/): Free left right sound and stereo test for speakers and headphones. Hear each channel, find swapped or mono audio, and get fixes for Windows, Mac, iPhone and Android.
- [Speaker Test Online: Tones, Sweep & Rattle](https://audiotesthq.com/speaker-test/): Free online speaker test: tones from 20 Hz to 20 kHz, a full frequency sweep and a rattle check. Test left, right or both speakers in your browser.
- [Headphone Test: Left Right, Earbuds & Drivers](https://audiotesthq.com/headphone-test/): Free headphone and earbuds test: check left and right channels, whether both drivers match, stereo imaging and high-frequency range. Wired or Bluetooth.
- [Bass Test: Subwoofer & Low Frequency Check](https://audiotesthq.com/bass-test/): Free bass test from 10 Hz to 200 Hz. Find where your speakers or subwoofer fade out, catch rattles, and fix a subwoofer that isn't working.
- [Surround Sound Test: 5.1 and 7.1 Speaker Check](https://audiotesthq.com/surround-sound-test/): Free 5.1 and 7.1 surround sound test. Detects how many channels your browser can drive, checks each speaker, and offers test files when it can't.
- [Audio Test Files: 5.1, 7.1 & Stereo WAV](https://audiotesthq.com/test-files/): Free audio test files in WAV and FLAC: stereo left/right, 2.1, 5.1 and 7.1 channel checks, pink noise, frequency sweeps and speaker polarity.
- [Speaker Polarity Test: Check Phase Online](https://audiotesthq.com/speaker-polarity-test/): Free speaker polarity test. Hear in-phase and out-of-phase versions and find a speaker wired backwards. Works for home stereo and car audio.
- [Mic Test Online: Check Your Microphone Level](https://audiotesthq.com/mic-test/): Free online mic test. Check your microphone works, and measure background noise, voice level and clipping in dBFS. Nothing is recorded or uploaded.
- [Mic Test with Playback: Record & Hear Yourself](https://audiotesthq.com/mic-test/playback/): Record yourself, hear it played back and download a WAV. Free mic test with playback that keeps the recording on your device. Compare processing on and off.
- [Audio Latency Test: Bluetooth Delay & AV Sync](https://audiotesthq.com/audio-latency-test/): Audio latency test in ms: time real clicks through your speakers and mic, or line up a flash and beep to check AV sync and Bluetooth audio delay.
- [Pitch Detector & Note Finder: What Note Is It?](https://audiotesthq.com/pitch-detector/): Free pitch detector and note finder. Sing or play a note to see its name, frequency in Hz and cents sharp or flat, live, with a pitch trace. Nothing is recorded.
- [Vocal Range Test: Find Your Voice Type Online](https://audiotesthq.com/vocal-range-test/): Free vocal range test. Sing your lowest and highest notes to find your range, see it on a keyboard, and match your closest voice type, from bass to soprano.
- [Vocal Ranges: Chart of All Voice Types](https://audiotesthq.com/vocal-ranges/): Vocal ranges for all six voice types, soprano to bass, on one keyboard chart with notes, frequencies, two reference sources and sounds you can play.
- [Soprano Range: Notes, Chart & Voice Test](https://audiotesthq.com/soprano-range/): Soprano vocal range: C4 to A5 (some sources C6), with frequencies, a keyboard chart, the notes to listen to and a free test to see if you are a soprano.
- [Mezzo-Soprano Range: Notes, Chart & Test](https://audiotesthq.com/mezzo-soprano-range/): What is a mezzo-soprano? Range A3 to F5, compared across sources, with a keyboard chart, notes you can play and a free test to see if you are a mezzo.
- [Alto & Contralto Range: Notes, Chart & Test](https://audiotesthq.com/alto-range/): Alto and contralto vocal range: F3 to D5, compared across sources, with frequencies, a keyboard chart, notes to play and a free test to check your voice.
- [Tenor Range: Notes, Chart & Voice Test](https://audiotesthq.com/tenor-range/): Tenor vocal range: about B2 to G4 (Grove: C3 to A4), with frequencies, a keyboard chart, the notes to hear and a free test to see if you are a tenor.
- [Baritone Range: Notes, Chart & Voice Test](https://audiotesthq.com/baritone-range/): Baritone vocal range: about G2 to E4 (Grove: A2 to F4), with frequencies, a keyboard chart, notes to hear and a free test to see if you are a baritone.
- [Bass Vocal Range: Notes, Chart & Voice Test](https://audiotesthq.com/bass-vocal-range/): Bass vocal range: about E2 to C4 (Grove: F2 to E4), with frequencies, a keyboard chart, notes to hear and a free test to see if you sing bass.
- [Countertenor Range: Male Alto Voice & Test](https://audiotesthq.com/countertenor-range/): What is a countertenor? A male alto voice, natural or falsetto, singing about F3 to D5. Keyboard chart, notes to play, and a free test of your range.
- [Noise Levels: Meter, Chart and Safe Limits](https://audiotesthq.com/noise-levels/): Measure noise levels with a free decibel meter, see a decibel chart of common sounds, and check safe daily exposure under NIOSH and OSHA limits.
- [Decibel Meter Online: dB & Sound Level Meter](https://audiotesthq.com/decibel-meter/): Free online decibel meter (dB meter). Measure noise in dBA, dBC or dBZ with Leq, max, L10/L90, a timeline, safe-time limits and CSV export. Nothing is recorded.
- [Classroom Noise Meter & Monitor: Free Online](https://audiotesthq.com/classroom-noise-meter/): Free classroom noise meter and monitor. A full-screen traffic light for the board, thresholds set from your room, and a quiet-streak timer. No login.
- [Noise Exposure Calculator: OSHA & NIOSH Dose](https://audiotesthq.com/noise-exposure-calculator/): Free noise exposure calculator. Enter noise levels and times to get your daily noise dose and 8-hour TWA under the NIOSH limit and the OSHA 1910.95 limit.
- [Decibel Chart: Sound Levels and Safe Times](https://audiotesthq.com/decibel-chart/): Decibel chart of common sounds from NIH and CDC, from conversation (60–70 dBA) to fireworks (140–160 dBA), with the safe daily time at each level.
- [What Is a Decibel? dB, dBA and dBFS Explained](https://audiotesthq.com/what-is-a-decibel/): What a decibel is, why the scale is logarithmic, how to add decibels, and what dBA, dBC, dBZ, dBFS and dB HL mean, with A and C weighting tables.
- [How Loud Is 20, 30, 40 or 50 Decibels?](https://audiotesthq.com/how-loud-is-20-decibels/): How loud is 20 to 50 decibels? A ticking watch (20 dB), a soft whisper (30 dB) and a refrigerator hum (40 dB), from CDC's former table. No hearing risk.
- [How Loud Is 60 or 70 Decibels? Examples](https://audiotesthq.com/how-loud-is-60-decibels/): How loud is 60 or 70 decibels? Around the level of normal conversation. No NIOSH or OSHA time limit applies below 80 dBA.
- [How Loud Is 75 Decibels? Examples & Safe Time](https://audiotesthq.com/how-loud-is-75-decibels/): How loud is 75 decibels? Around the level of a movie theater. No NIOSH or OSHA time limit applies below 80 dBA.
- [How Loud Is 80 Decibels? Examples & Safe Time](https://audiotesthq.com/how-loud-is-80-decibels/): How loud is 80 decibels? Around the level of motorcycles and dirt bikes. NIOSH allows about 25 h a day and OSHA 32 h, more than a full day.
- [How Loud Is 85 Decibels? Examples & Safe Time](https://audiotesthq.com/how-loud-is-85-decibels/): How loud is 85 decibels? Around the level of noise loud enough that you have to raise your voice to be heard 3 feet away. NIOSH safe time: 8 h a day; OSHA: 16 h.
- [How Loud Is 90 Decibels? Examples & Safe Time](https://audiotesthq.com/how-loud-is-90-decibels/): How loud is 90 decibels? Around the level of lawn mowers, vacuums and power tools. NIOSH safe time: 2 h 31 min a day; OSHA: 8 h.
- [How Loud Is 100 Decibels? Examples & Safe Time](https://audiotesthq.com/how-loud-is-100-decibels/): How loud is 100 decibels? Around the level of bulldozers, sirens and chain saws. NIOSH safe time: 15 min a day; OSHA: 2 h.
- [How Loud Is 110 Decibels? Examples & Safe Time](https://audiotesthq.com/how-loud-is-110-decibels/): How loud is 110 decibels? Around the level of sirens. NIOSH safe time: 1 min 29 s a day; OSHA: 30 min.
- [How Loud Is 120 Decibels? Examples & Safe Time](https://audiotesthq.com/how-loud-is-120-decibels/): How loud is 120 decibels? Around the level of sirens. Effectively no safe time; beyond OSHA's table, which stops at 115 dBA.
- [How Loud Is 150 Decibels? Examples & Safe Time](https://audiotesthq.com/how-loud-is-150-decibels/): How loud is 150 decibels? Around the level of a fireworks show. Effectively no safe time; beyond OSHA's table, which stops at 115 dBA.
- [Online Tone Generator & Frequency Generator](https://audiotesthq.com/tone-generator/): Free online tone generator and frequency generator. Play any Hz as sine, square, triangle or sawtooth, mix up to 4 tones, sweep, pan, and download a WAV.
- [Frequency Sweep Generator: 20 Hz–20 kHz Online](https://audiotesthq.com/frequency-sweep/): Free online frequency sweep generator. Sweep 20 Hz to 20 kHz or any range, log or linear, once or looped, see the live frequency and download a WAV.
- [DTMF Tone Generator and Decoder Online](https://audiotesthq.com/dtmf-tones/): Free DTMF tone generator and decoder. Play touch-tone keys and sequences, download WAV, and decode keys from your mic or an audio file. ITU-T Q.23 frequencies.
- [Audio Spectrum Analyzer: Live FFT & 1/3 Octave](https://audiotesthq.com/spectrum-analyzer/): Free online audio spectrum analyzer. See live frequencies from your mic or an audio file as an FFT spectrum, 1/3-octave bands or a spectrogram. Export PNG and CSV.
- [High Pitch Sound: High Frequency Tones Online](https://audiotesthq.com/high-frequency-sound/): Play high pitch sounds from 8 kHz to your device limit, step by step or as a sweep, find the highest tone you can hear, and download a WAV. Volume starts low.
- [440 Hz Tone: Play A4 Tuning Pitch & WAV](https://audiotesthq.com/440-hz/): Play a 440 Hz tone, the note A4 and the ISO 16 standard tuning pitch. Tune by ear, compare with 442 and 432 Hz, and download an exact 440 Hz WAV.
- [Audio Guides: Fix Mic & Speaker Problems](https://audiotesthq.com/guides/): Step-by-step guides to fix microphone, speaker and headphone problems on Windows, Mac and phones, each with a live test to check the fix worked.
- [Microphone Not Working on Windows 11? Fix It](https://audiotesthq.com/guides/microphone-not-working-windows-11/): Fix a microphone not working on Windows 11: privacy settings, input device, volume, troubleshooter and drivers, using Microsoft's steps, with a live mic test.
- [About AudioTestHQ: Free Browser Audio Tests](https://audiotesthq.com/about/): AudioTestHQ is a free set of browser-based audio tests built and maintained by Sri Murugan Systems, an independent software developer in Madurai, India.
- [How Our Audio Tests Work: Signals & Limits](https://audiotesthq.com/methodology/): The exact test signals, levels and measurement methods behind every AudioTestHQ test, what a browser can and cannot measure, and the sources we use.
- [Privacy Policy](https://audiotesthq.com/privacy/): AudioTestHQ privacy policy: audio you play or record never leaves your device. What analytics and advertising cookies may be used, and how to contact us.
- [Contact AudioTestHQ](https://audiotesthq.com/contact/): Contact AudioTestHQ, run by Sri Murugan Systems: report a problem with a test, suggest a new test or ask a question. Email and postal address.

## Contact
- contactus@audiotesthq.com