Half Step Down Tuning for Bass Guitar

Half Step Down (Eb) runs D#1, G#1, C#2, F#2, in playing order. The lowest-pitched string is D#1 (38.89 Hz) and the highest is F#2 (92.50 Hz), measured against A4 = 440 Hz. Those are the exact target frequencies the tuner on this page listens for.

4 of the 4 strings move: E1 down 1 semitone(s) to D#1; A1 down 1 semitone(s) to G#1; D2 down 1 semitone(s) to C#2; G2 down 1 semitone(s) to F#2. Work through them in order, then go back and re-check the first string — retuning shifts the neck tension slightly, so the earlier strings drift as you go.

Every string down a semitone to match a guitarist tuned to Eb. Shapes are unchanged and the slightly lower tension is generally welcome on bass, where standard tension is already high.

D#1 is 38.89 Hz at concert pitch (A4 = 440 Hz). That's the fundamental — the string also produces harmonics above it, which is why a tuner reading the wrong octave usually means it locked onto a harmonic rather than the fundamental. This is the lowest string in this bass tuning.

All four strings down one semitone, intervals untouched, so every shape and scale position transfers exactly. Bass benefits from the tension drop more than guitar does, since standard bass tension is already high enough that a semitone of relief is felt immediately in the fretting hand. The usual reason is to match a guitarist in Eb rather than any tonal preference. Because the interval structure is unchanged, a bassist can read charts written in standard and simply hear everything a semitone lower without transposing anything mentally.