This is an incredibly deep and heavy 7-string guitar tuning, officially described as "octave down d standard" and associated with "mick gordon tuning for 7 string". We've dubbed it "Doom's Low D Standard" to reflect its immense sonic potential for crushing riffs and atmospheric textures, reminiscent of Mick Gordon's iconic scores.

Technical Analysis:

The tuning takes a 7-string guitar into an exceptionally low range, with the open strings set to D1-G1-C2-F2-A2-D3-G3 (from the lowest to the highest string). This arrangement is essentially a D Standard tuning, but transposed to an extreme lower register, starting with D1 – a note significantly lower than typically found on a standard guitar.

• Open Chords & Intervals: While not a conventional open major or minor chord tuning, the open strings D1-G1-C2-F2-A2-D3-G3 offer powerful harmonic possibilities. The combination of D1, F2, A2, and D3 immediately forms a thick D minor triad (D-F-A-D). The inclusion of G and C notes provides a palette for suspended and extended chords, such as Dsus4 (using D1, G1, D3) or Gsus4 (using G1, C2). The repetition of D and G at various octaves (D1, D3 and G1, G3) contributes to a dense, resonant sound, ideal for powerful, sustained chords and single-note riffs, providing a strong tonal center around D.
• Fourth-Based Structure: A defining characteristic of this tuning is the prevalence of perfect fourth intervals. Strings 7-6 (D1-G1), 6-5 (G1-C2), 5-4 (C2-F2), 3-2 (A2-D3), and 2-1 (D3-G3) are all tuned a perfect fourth (5 semitones) apart. This consistent intervallic relationship across most strings makes movable chord shapes and scale patterns highly intuitive and consistent across the fretboard, similar to a bass guitar. The only deviation is the major third (4 semitones) between String 4 (F2) and String 3 (A2), which can be utilized for easier formation of standard major and minor chord voicings in the middle register, adding a touch of melodic flexibility within the otherwise heavy framework.
• Playability & String Gauge: Achieving this tuning requires significant detuning across all strings. Each string is tuned down either 9 or 10 semitones from a presumed standard starting point. Such drastic adjustments (exceeding 4 semitones up or down) necessitate the use of extremely heavy gauge strings. Using standard string gauges will result in extremely slack tension, poor intonation, unwanted buzzing, and potential damage to your guitar's setup. Dedicated heavy gauge strings designed for baritone or extended-range guitars are essential to ensure proper playability, optimal tone, and the longevity of your instrument.

Verbal Analysis:

"Doom's Low D Standard" is a tuning built for maximum sonic impact. Its primary purpose is to deliver a massive, guttural sound, perfect for the low-end, chugging riffs, and earth-shaking breakdowns synonymous with modern metal, particularly the aggressive style popularized by Mick Gordon. The extremely low D1 on the 7th string provides an immense foundation, allowing for incredibly deep drone notes and punishing power chords that will rattle listeners to their core. The consistent fourths layout also offers versatility for complex, technical playing while maintaining that essential low-end aggression. This tuning is not for the faint of heart; it demands commitment to heavy gauges and a robust guitar setup, but the reward is an unparalleled, crushing sonic palette perfect for heavy music genres.

How to Tune: Doom's Low D Standard

This tuning requires significant detuning, so it is highly recommended to use a set of heavy gauge strings specifically designed for very low tunings to ensure proper tension, intonation, and playability. Tune your 7-string guitar to the following notes, making the indicated adjustments from your current standard tuning (e.g., B-E-A-D-G-B-E for a 7-string):

• String 7 (Lowest String): Tune down 9 semitones to D1.
• String 6: Tune down 9 semitones to G1.
• String 5: Tune down 9 semitones to C2.
• String 4: Tune down 9 semitones to F2.
• String 3: Tune down 10 semitones to A2.
• String 2: Tune down 9 semitones to D3.
• String 1 (Highest String): Tune down 9 semitones to G3.

Note: Tuning down more than 4 semitones significantly reduces string tension. For optimal performance and to avoid intonation issues, a much heavier string gauge than standard is essential for this tuning. Failure to use appropriate string gauges may lead to poor tone, excessive fret buzz, and potential damage to your guitar.