4-String Bass tuner – Eb / Half Step Down
D#-G#-C#-F# · Standard
Press “Start tuner” – the browser will ask for microphone access. Sound is analysed on this device and never uploaded.
This free online tuner listens through your microphone and shows how close each string of your 4-String Bass is to Eb / Half Step Down tuning (D#-G#-C#-F#). Play a string, watch the needle, and turn the peg until the meter glows green. If you prefer tuning by ear, tap any string card to hear its reference tone.
About Eb / Half Step Down tuning
Compared with Standard (EADG), Eb / Half Step Down moves 4 strings. Every change is downward, the largest by 1 semitone, so the instrument sits at lower tension than in Standard (EADG).
| String | Standard (EADG) | Eb / Half Step Down | Change |
|---|---|---|---|
| 1 | E1 | D#1 | down 1 semitone |
| 2 | A1 | G#1 | down 1 semitone |
| 3 | D2 | C#2 | down 1 semitone |
| 4 | G2 | F#2 | down 1 semitone |
Played open, the strings sound D#-G#-C#-F# – from D#1 at the bottom to F#2 at the top, a span of 1 octave and 3 semitones. Step by step across the neck the intervals are a fourth, a fourth, a fourth, and that is what decides how chord shapes fall under the hand.
Eb tuning moves the whole bass down a semitone, keeping every interval and every shape. Bands that tune their guitars down a half step need the bass to match, and this is how it is done.
The lower tension is slightly easier on the hands and gives a fatter, looser attack – which is part of why some players use it even when nothing in the arrangement demands it.
The drop is small enough that a standard set handles it. If the lowest string starts to rattle against the frets, one step up in gauge fixes it.
History
Where the Eb / Half Step Down tuning comes from
Bass players tune down a half step when their guitarists do – the history of this tuning follows the E♭ guitar tuning of Jimi Hendrix, Stevie Ray Vaughan and many rock and metal bands of the 1970s and 80s.
Other 4-String Bass tunings
Alternative
Chords for this tuning
How do I tune my 4-String Bass to Eb / Half Step Down?
Allow microphone access, pluck a string, and the tuner will detect it automatically. The needle shows whether the string is flat or sharp – adjust until the reading is within ±5 cents (D#-G#-C#-F#).
Which notes are used in Eb / Half Step Down tuning?
Eb / Half Step Down tuning for 4-String Bass uses the notes D#-G#-C#-F#, listed from the lowest string to the highest.
Can I tune without a microphone?
Yes. Every string card plays a reference tone – tap it and match your string to the sound by ear.