40 Hz
Play it, then see what note it is closest to
Around the open low E of a bass dropped to D, and the bottom of many kick drums. Energy here is felt in the chest.
The nearest equal-tempered pitch is D♯1 at 38.89 Hz, 49 cents below this tone. The full generator, with sweeps and noise, is the tone generator. This page is the canonical reference for 40 Hz.
Nearby published frequencies
Find this band inside real music.
Frequency training in the app hides a boost in a loop and asks you to name it, which is harder than a naked sine wave.
Download on theApp Store- EQ & compressionDaily drills on drums, bass, guitars and full mixes.
- Intervals & chordsPiano training that uses the same note names as these pages.
- Studio toolsMetronome, tone generator and tap tempo live in the app too.
Explore the cluster
Keep training & testing
FAQ
40 Hz questions
What note is 40 Hz?
D♯1, 49 cents sharp, when A4 is 440 Hz.
Why publish 40 Hz and not 41 Hz?
Because this one sits on a band engineers solo, a tuning reference, or a hearing check. The tone generator already plays every frequency in between.
How loud should I listen?
Keep a 40 Hz tone at a conversation level. These pages can generate steady tones and noise, which fatigue your ears faster than music. If anything rings or feels uncomfortable, stop and turn the volume down.