低音が本当に途切れる場所を見つけましょう。20〜100Hzの固定トーン7つと、ゆっくりした低域スイープ。クリアに聞こえる最も低いトーンが、あなたの機材の本当の下限です。
⚠ 小さい音量から始めてください。大音量の持続低音はサブウーファーの底打ちや小型ドライバーの過熱を招きます。
トーンが無音: 機材の再生範囲より下 — サブウーファーなしで20〜40Hzが聞こえないのは正常。 トーンが1つ上のトーンより高く聞こえる: 聞こえているのは高調波歪みで、基音ではありません。 ビリつき・ガタつき: 何かが緩んでいます — ドライバー、グリル、または家具。 スイープのある場所で大きく、別の場所で消える: ルームモード — 部屋の性質で、スピーカーの欠陥ではありません。
さらに詳しく: Subwoofer Test · Bass Tone Generator · Room Mode Calculator · Fix My Speaker · Sound Test
おおよその目安: ノートPCのスピーカーは150〜200Hz前後で限界。小型Bluetoothスピーカーは80〜100Hz前後。まともなブックシェルフスピーカーは50〜60Hzまで。良いオーバーイヤーヘッドホンは20〜30Hzを(小さくても聞こえるレベルで)再生。本物のサブウーファーは25〜30Hzでクリアに出力でき、多くは20Hzまで届きます。定格より2段上のトーンが無音なら、ハードを疑う前に音量と設置を確認してください。
聞こえているのはほぼ確実に高調波歪みで、20Hzそのものではありません。小型ドライバーを再生範囲より下まで追い込むと、40・60・80Hzの倍音が発生し、脳はそれを「低い音」として受け取ります。簡単な確認方法: 20Hzの「トーン」が40Hzのトーンと似た高さに聞こえるなら、聞こえているのは歪みであって基音ではありません。
ルームモードです。低周波の波長は数メートルもあり、平行な壁の間で反射して、波が重なる場所(こもる)と打ち消し合う場所(消える)を作ります。これは部屋の性質であってスピーカーの故障ではありません。ルームモード計算機で問題の周波数を割り出し、実際のリスニングポジションでテストしてください。
音量4分の1程度から始めて徐々に上げてください。低い周波数は測定値より小さく感じられます — 等ラウドネス曲線により、40Hzが1kHzと同じ大きさに聞こえるにははるかに多くのエネルギーが必要です。そのため、気づかないうちに小型スピーカーを歪ませたりサブウーファーを底打ちさせたりしがちです。グリルのガタつきやパネルのうなりは音量を下げるサインです。
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.