30秒で確信へ。左、右、センター、フルスイープ、低音チェック。5つすべてが正常なら音は問題なし — 1つでも失敗したら、どこを調べるべきかが正確にわかります。
片方が無音か小さい: OSのバランス設定、ケーブル、詰まったグリルを確認。 低音がビリつく: ゴミか振動 — スピーカークリーナーがほこりと水に対応します。 スイープが不均一に聞こえる: フル機能のスイープジェネレーターで正確に測り、高域は機材ではなく耳のせいでないかも確認を。
診断ツール: Headphone Test · Balance Test · Fix My Speaker · Sweep Generator · Hearing Age Test · Mic Test
チェックを順番に実行してください。「左」は左チャンネルだけ、「右」は右だけ、「センター」は真ん中に定位し、スイープは途切れなく低音から高音へ滑らかに、低音トーンはビリつかずクリアに聞こえるはずです。30秒で、問題が端末なのか、スピーカーなのか、特定チャンネルなのかがわかります。
順番に: 端末とOSの物理音量とミュート、出力デバイスの選択(Bluetooth機器は気づかぬうちに出力を奪いがち)、ブラウザのタブミュート(タブを右クリック)、ケーブルやペアリング。別のサイトやアプリで音が出るならアプリ単位の問題、何も鳴らないならシステム全体の問題です。
まずOSのバランス設定を確認(アップデート後にずれることがあります)、次にケーブル — トーンを鳴らしながらプラグ付近を揺らし、ガリガリ鳴るなら断線です。イヤホンなら耳垢フィルターの詰まりが最多原因。それらを確認してからドライバーを疑ってください。完全な診断手順はヘッドホンテストのページにあります。
スイープの空白は機材(高域なら耳)が再生できない周波数です — 小型スピーカーで100Hz以下が聞こえないのは正常。低音トーンのビリつきは何かが振動しているサイン: 振動板の毛、緩んだグリル、共振する家具など。グリルを掃除し、スピーカーを離して置き直してから再テストを。
Generate single tones with precise frequency control. Perfect for quick audio testing and tuning.
Play multiple frequencies simultaneously with independent volume and panning controls.
Create linear or exponential frequency sweeps for speaker testing and room acoustics analysis.
Generate binaural beats for meditation, focus, and relaxation. Requires headphones for proper effect.
Generate telephone dial pad tones (Dual Tone Multi Frequency). Interactive touch-tone dial pad.
Professional metronome with tap tempo, time signatures, subdivisions, and tempo trainer for musicians.
Tap along to any song to find its tempo in beats per minute. Includes tempo markings reference.
Hear major, minor, diminished, and seventh chords in every key. Block chords or arpeggios.
Hear classic progressions like I-V-vi-IV and 12-bar blues in any key at any tempo.
Free browser piano with 3 octaves, note names, and computer keyboard support.
Generate white, pink, and brown noise for sleep, focus, tinnitus relief, and speaker burn-in.
Reference tuning notes for guitar, bass, ukulele, violin, cello, and more at concert pitch (A440).
Test your subwoofer with a 60-second frequency sweep (150Hz-1Hz) and individual bass test tones.
Test your hearing range from 8kHz to 20kHz. Find your hearing age and compare with averages.
Ancient healing tones including 528Hz (DNA repair). For meditation, chakra activation, and spiritual healing.
Test stereo balance with panning control and left/right channel testing. Perfect for speaker setup.
Check speaker wiring polarity by comparing in-phase and out-of-phase test signals.
Measure your Bluetooth or system audio delay in milliseconds with a click-and-flash sync test.
Real-time frequency analysis of your microphone input with a live log-frequency display.
Measure approximate sound levels with your microphone - live dB with min/avg/max tracking.
Check your microphone in seconds: live waveform, level meter, and record-and-playback check.
Learn to recognize musical intervals by ear with quiz mode, score tracking, and song mnemonics.
Chromatic pitch pipe with all 12 notes across 3 octaves. Perfect for singers, choirs, and a cappella groups.
Experience the auditory illusion of an infinitely ascending or descending tone. Mind-bending psychoacoustic phenomenon.
Can you hear the mosquito tone? High-frequency test (15-20kHz) that only young people can hear. Find your hearing age!
Create relaxing ambient soundscapes with singing bowls, nature sounds, and binaural beats.
Three sound modes to clean a muffled speaker: 165 Hz water eject, dust-shaking sweeps, and vibration.
Push water out of a wet phone or watch speaker with a pulsed 165 Hz tone - the same method Apple Watch uses.
Adjustable high-frequency whistle (8-22 kHz) for dog training - clearly audible to dogs, silent to most adults.
Rhythmic pulsed tones across delta to gamma ranges. Stronger than binaural beats and works without headphones.
Name 12 random notes with no reference tone and find out if you have absolute pitch or great pitch memory.
Sing your lowest and highest notes and get your range plus voice type - bass to soprano. Mic-based, nothing uploaded.
Find the highest frequency you can hear (8-20 kHz) and see how old your ears test. Takes one minute.
Instant karaoke via center-channel cancellation - free, unlimited, and processed locally.
Record from your microphone and download as WAV - no signup, nothing uploaded.
Normalize any file to a LUFS target with true-peak protection instead of silent clipping.
16-step beat maker with synthesized 808-style drums, swing, and shareable pattern links.
Drop a file and get integrated LUFS, true peak, RMS, and a waveform - measured locally, nothing uploaded.
Microphone tuner with a cents needle - play any note on any instrument and tune to ±5 cents.
Five-minute headphone checkup: channels, wiring polarity, bass and treble reach, and driver distortion.
Send noise to each 5.1 channel - fronts, center, surrounds, and subwoofer - and catch swapped or dead speakers.