double bass
Enable an AI agent to recognise a double bass, assess its configuration and playing condition, and determine suitable performance, setup, handling and care actions.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an AI agent to recognise a double bass, assess its configuration and playing condition, and determine suitable performance, setup, handling and care actions.
A double bass is a large, low-pitched bowed string instrument with a resonating body and fretless fingerboard, usually fitted with four strings tuned in fourths, and played upright with a bow or by plucking.
It can be Identify the instrument and document uncertain boundaries with electric upright or historical bass instruments.; Determine available pitches from the actual strings, tuning and extension mechanism.; Assess suitability for bowed, plucked or mixed playing from setup and observed response.; Match strings, bows, cases and amplification equipment to recorded dimensions and interfaces.; Assess endpin support and playing-height adjustments before use.; Triage playing and structural problems and route bridge, soundpost or body work to an appropriate specialist..
Distinguishing features
Check for an upright playing configuration with a long neck, bridge-supported strings and a body normally supported from below by an endpin; body size alone does not establish identity.
Distinguish it from a bass guitar by its upright instrument geometry, fingerboard access and bridge configuration rather than by low register or amplification alone.
Distinguish it from a cello using the combined evidence of intended register, string configuration, speaking length, body proportions and playing posture; no single dimensional threshold is assumed.
For an acoustic example, check that the bridge couples the strings to a resonant body; for a reduced-body electric upright, record whether its design and playing geometry justify inclusion.
Distinguish it from historical bowed bass instruments through construction, tuning and documented identification rather than treating every large upright bowed instrument as a double bass.
Scope
+ Identification of acoustic double basses and the boundary with electric upright variants
+ Body, neck, fingerboard, bridge, strings, tuning hardware and endpin configuration
+ String tuning, speaking length, playable range and range-extending equipment
+ Bowed and plucked operation, physical playing fit and sound production
+ Structural condition, setup, amplification interfaces and transport requirements
- Bass guitar construction and operation
- Bows, amplifiers, pickups and cases as independently modelled accessory kinds
- The player's proficiency, health or occupational role
- Compositions, bass parts, notation systems and performance rights
- Maker biographies, product catalogues and ownership transactions
Characteristics
- Instrument configuration
- acoustic; acoustic with pickup; electric upright candidate; unresolved Determines how sound is produced and whether the instrument falls within the model boundary.
- String count
- count Affects range, neck layout and compatible setup.
- Open-string tuning
- ordered pitches with octave designation and reference frequency in Hz Establishes the current pitch configuration without assuming every double bass uses the same tuning.
- Speaking string length
- mm, measured from the active upper termination to the bridge Supports string selection and assessment of reach and setup.
- Range extension
- none; fingerboard extension with or without stops; additional string; other documented arrangement Determines how pitches below the ordinary configuration are accessed.
- Body construction
- record materials and carved, laminated or mixed construction by component Informs structural assessment and repair decisions without inferring quality from a label.
- Body and transport dimensions
- mm for overall length, body length, bout widths and depth Supports case fit, storage and transport planning more reliably than nominal size alone.
- String clearance
- mm per string at a stated fingerboard position Helps assess playability and whether setup suits the intended technique.
- Bridge and fingerboard geometry
- documented curvature, alignment, relief and visible wear Affects clean bow access, stopping effort and unwanted contact noise.
- Structural condition
- observed cracks, seam openings, bridge deformation, neck movement and internal-support concerns, with inspection confidence Determines whether playing or adjustment should pause pending specialist assessment.
- Endpin configuration
- extension in mm; angle if adjustable; lock security; tip and floor-contact condition Controls playing height and support stability.
- Installed signal system
- linked pickup, microphone, preamplifier and connector specifications, or none Enables compatible amplification and separates acoustic faults from signal-chain faults.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 17 findings · 27 questions.
Identity and variant Establish which physical instrument configurations the double bass entry covers.
Low pitch and upright posture alone cannot distinguish a double bass from neighbouring instrument kinds.
Instrument boundary
Identify the instrument using construction and playing geometry.
Double bass identification
Record evidence for identification without relying solely on a seller's label or nominal size.
- Which observed body, neck, bridge and support features establish this instrument as a double bass? definition
- What distinguishes this example from a cello, bass guitar or historical bowed bass instrument? boundary
Variant and attribution
Separate physical configuration from attributed maker and product identity.
Configuration evidence
Record whether identification depends on acoustic construction, electric upright design or documentary evidence.
- Does this electric upright variant belong within the registered double bass concept, and on what evidence? boundary
- Which labels, maker records or specialist assessments support its stated identity, and which remain unverified? provenance
Strings, tuning and range Describe the installed string system and the pitches its configuration permits.
String count, tuning and extensions change the instrument's usable range and setup requirements.
Installed string system
Document strings and their active lengths rather than assuming a standard configuration.
String and tuning map
Associate each installed string with its specification, speaking length and current open pitch.
- How many strings are installed, and what is each string's open pitch and speaking length? measurement
- What manufacturer information establishes compatibility with this length and intended tuning? provenance
Extended register
Identify how extra low pitches are produced and controlled.
Extension operation
Record additional strings or extension mechanisms and their actual operating states.
- What is the lowest available open pitch in each documented extension or stop configuration? measurement
- How are extension stops engaged and released, and what must be checked before changing their state? action
Construction and sound Relate string vibration to the body or installed electrical signal system.
Acoustic response, structural support and amplification depend on different parts of the double bass.
Acoustic assembly
Describe the bridge, resonant body and internal support where present.
Bridge and body coupling
Record the construction and observable condition of the components that carry string load and transmit vibration.
- What materials and construction methods are documented for the top, back and ribs? provenance
- What can inspection establish about bridge seating, internal supports and body integrity, and what remains inaccessible? measurement
Amplified output
Capture the installed transducer and its connection requirements.
Signal path
Distinguish the instrument's physical response from pickup, preamplifier and amplification behaviour.
- Which transducer is installed, where is it mounted, and what power and input requirements are documented? provenance
- What comparison of acoustic and amplified output would help locate a reported buzz, weak string or feedback problem? action
Playing fit and response Assess how instrument geometry supports the intended playing techniques.
A double bass can be structurally sound yet poorly configured for a player's reach, bow access or plucking requirements.
Support and reach
Record the adjustable support and dimensions governing playing position.
Endpin and playing height
Assess stable support and access to the fingerboard in the intended posture.
- What endpin extension and instrument position permit the intended player to reach the required fingerboard regions? measurement
- What checks establish that the endpin lock and floor contact will hold during playing? action
Bowed and plucked setup
Relate string clearance and surface geometry to arco and pizzicato use.
Technique-dependent response
Document observed playing response alongside the intended technique and setup measurements.
- What are the per-string clearances at stated reference points, and where does unwanted string contact occur? measurement
- Can each string be bowed independently and plucked with the intended attack without unintended contact or persistent noise? action
Condition, care and movement Determine whether the instrument can be played, adjusted, stored or transported in its observed state.
The tall supported form, loaded bridge and potentially vulnerable resonant body require instrument-specific decisions.
Condition and intervention
Separate routine adjustments from conditions needing a bass repair specialist.
Structural triage
Record visible defects and changes in playing behaviour without treating remote observation as a complete inspection.
- Are there cracks, open seams, bridge deformation, neck movement or sudden setup changes, and when were they first observed? measurement
- Which observed conditions require stopping use or obtaining specialist assessment before tuning or adjustment? action
Storage and transport
Plan support, environmental care and case fit for the actual construction and dimensions.
Protected movement
Record how the instrument is supported and protected, including protruding extensions and installed electronics.
- Do measured instrument dimensions, including any scroll extension, fit the proposed case and transport route? measurement
- What maker or repairer guidance governs environmental conditions, support points and preparation for transport? provenance
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This describes the instrument kind, not a particular maker, product model or individual instrument.
- Fractional sizes such as three-quarter are conventional labels rather than reliable proportional dimensions; dimensions vary by maker.
- Standard tuning is given at sounding pitch; double-bass parts conventionally sound one octave below written pitch, and alternative tunings exist.
- Which of these check these first hold for the sense of double bass this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Four-string double bass
- Five-string double bass
- Four-string double bass with a low-C extension
- Which of these kinds and varieties hold for the sense of double bass this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Providing the lowest string part in orchestras
- Playing bass lines and solos in jazz
- Providing rhythmic and harmonic support in bluegrass, folk and rockabilly
- Performing chamber music and solo repertoire
- Which of these real-world use hold for the sense of double bass this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Vibrating string length on common adult instruments - Approximately 104-110 - cm
- Open-string pitches in standard four-string tuning - E1, A1, D2, G2 - scientific pitch notation
- Lowest standard open-string frequency at A4 = 440 Hz - Approximately 41.2 - Hz
- Which of these typical measurements hold for the sense of double bass this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Humidity changes can cause cracks, open glue joints and changes in string height.
- A leaning or warped bridge can impair playing and may collapse under string tension.
- A displaced soundpost can impair tone and require professional resetting.
- Strings and bow hair wear and can break.
- Poor lifting technique or sustained awkward playing posture can cause musculoskeletal strain.
- Which of these failure modes and hazards hold for the sense of double bass this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- French and German bow designs and grips coexist, with preferences varying by teaching tradition and ensemble.
- Low-C extensions and five-string instruments are alternative ways to obtain lower orchestral notes; their prevalence varies among orchestral traditions.
- Which of these regional variation hold for the sense of double bass this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- cello - The cello is smaller, normally tuned in fifths to C2-G2-D3-A3, and usually played seated with the body between the knees.
- bass guitar - A bass guitar has a guitar-form body and playing position, usually has frets, and typically relies on electrical amplification.
- electric upright bass - An electric upright bass preserves upright bass playing geometry but relies primarily on pickups and amplification rather than a full acoustic resonating body.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of double bass this model covers, and on what evidence? provenance
What the second pass must settle
- Does the registry intend electric upright basses to be included, or should they be represented by a neighbouring model?
- Which existing Vercy or world model, if any, already owns the double bass concept and should remain its single source of truth?
- Which authoritative references establish the boundary with historical bass viols and other large bowed bass instruments?
- Which measurement conventions and setup guidance should be used across differing string lengths, player needs and arco or pizzicato preferences?
- Which construction-specific care limits and specialist intervention criteria can be supported by maker or conservation sources?