Luthiers argue:

Skeptics say: The “Bass Dragon” is just a pre-existing flaw that chose that dramatic moment to reveal itself.

But believers whisper: The crack is always ruler-straight, never jagged — as if cut by a dragon’s claw.

In the late 1970s, a session bassist in New Orleans owned a custom hollow-body bass with a spruce top. One humid night, during a fevered jam, he hit his low E string (tuned to E1) and his A string (tuned up to E1 for a special “unison riff”). The two E notes, identical in pitch, came out of his amp in perfect phase. The sound pressure inside the bass’s hollow body reportedly built up, and crack — a straight line appeared along the grain, from F-hole to tailpiece.

No impact. No temperature shock. Just… the note splitting wood.

| Item | Purpose | |------|---------| | Cleats (small spruce patches) | Stop crack propagation | | Hot hide glue (preferred) | Strong, reversible, acoustically transparent | | Pal knife or crack chisel | Clean the crack | | Magnets or clamps with cauls | Hold cleats from inside | | Flexible mirror & light | Inspect internal dragon bar | | Spool clamps or rope clamp | External crack closure |

On paper: A single, perfectly straight crack running along the top wood of an acoustic or semi-hollow bass — but only appearing when two strings tuned in unison (same pitch) are played simultaneously at high volume.

In practice: Something that seems to defy physics.

If you design your own Bass Dragon-style patches, follow these rules to prevent the top crack from ever appearing.

Believe it or not, making the top end ( >8kHz) mono kills the Bass Dragon Unison Top Crack instantly. Phase issues cannot exist without stereo differences. Use a utility plugin to set frequencies above 8kHz to 0% stereo width. You will lose air, but you gain clarity. Add a pure sine wave-based exciter to bring back the air.

Insert a multiband transient processor (like Kilohearts Transient Shaper or iZotope Neutron).