This is an extraordinarily low and heavy tuning designed for 9-string guitars. It pushes the boundaries of conventional guitar playing into the sub-bass frequencies, creating a massive, wall-of-sound foundation. The presence of E and B across multiple octaves, particularly at the lowest registers (B0, E1, B1, E2), suggests a tuning built for extreme genres like djent, doom, deathcore, or experimental soundscapes where immense depth and impact are paramount. The "drop" nature of the E strings provides easy power chords for rhythmic, super chuggy riffs in B and E, as noted in the original description.

Technical Analysis

• Fundamental Range: The tuning spans an incredible range from B0 (extremely deep, approaching organ pedal territory) to E4 (standard high E string).
• Octave Relationships: Multiple octaves of B and E are present, creating a rich, resonant harmonic structure.
  • Strings 9 (B0) and 7 (B1) are an octave apart.
  • Strings 8 (E1) and 6 (E2) are an octave apart.
  • Strings 6 (E2) and 1 (E4) are two octaves apart.
  • Strings 7 (B1) and 2 (B3) are two octaves apart.
• Intervals & Chords:
  • The sequence of the lowest four strings (B0-E1-B1-E2) creates a powerful and easily accessible set of perfect 4th intervals, which is ideal for heavy, driving riffs and open-string drones.
  • From the 6th string upwards (E2-A2-D3-G3-B3-E4), the tuning essentially mirrors a standard EADGBe guitar setup, just shifted down by two octaves. This means existing chord shapes and scale patterns can be easily applied to this section of the fretboard, providing familiarity within the extreme low end.
  • Open Chords:
    • A massive open B power chord can be achieved by striking strings 9 (B0), 7 (B1), and 2 (B3) together, potentially layering with the E strings for an even denser sound.
    • An open E power chord is readily available by playing strings 8 (E1), 6 (E2), and 1 (E4).
    • The contiguous perfect 4ths on the lowest strings (B0, E1, B1, E2) are perfect for open string chugging and massive, low-frequency power chords. For example, playing all four strings open (B0-E1-B1-E2) creates an incredibly thick and resonant B-dominant sound.

How to Tune

This tuning requires careful adjustment of your lowest strings. Please ensure your instrument is properly set up for such low tunings, potentially requiring a heavier gauge string set for optimal tension and intonation, especially for the lowest two strings.

• String 9 (Lowest String): Tune from C1 down 2 semitones to B0.
• String 8: Tune from F1 down 2 semitones to E1.
• String 7: Keep as is; no change (0 semitones) at B1.
• String 6: Keep as is; no change (0 semitones) at E2.
• String 5: Keep as is; no change (0 semitones) at A2.
• String 4: Keep as is; no change (0 semitones) at D3.
• String 3: Keep as is; no change (0 semitones) at G3.
• String 2: Keep as is; no change (0 semitones) at B3.
• String 1 (Highest String): Keep as is; no change (0 semitones) at E4.

Note: Tuning down 2 semitones is generally safe for standard string gauges. However, given the extremely low target notes of B0 and E1, a significantly heavier gauge string set is highly recommended for these lowest two strings to maintain optimal tension, intonation, and playability.