Essential
Focused and powerful: the Precision concept distilled into a modern, balanced instrument.
From $2,700
Explore Essential
Bass · P-styleFrom $2,700
B·4. The Precision Bass, refined.
Power. Presence. Purity.
Compact, centered, and balanced: the familiar authority and punch of a single-pickup instrument. Classic tone, modern execution.
Three series, one shape.
Essential, Masterbuilt and Signature: the same B·4, each at a different level of customization and artistry.
Masterbuilt
Premium tonewoods, advanced finishes, and flexible electronics: a commanding presence and precise response.
From $4,000
Explore Masterbuilt
Signature
The ultimate form of the B·4: fully bespoke, handcrafted from select materials, and voiced to your preferences.
From $5,000
Explore Signature
Power. Presence. Purity.
The B·4 redefines the Precision-style bass through Belforti’s lens of engineering and design refinement. Compact, centered, and balanced, it delivers the familiar authority and punch of a single-pickup instrument while removing every ergonomic limitation of its predecessors. Its symmetrical body and optimized contours improve comfort without losing the weight and impact that make this archetype timeless. The result: a bass that feels grounded, resonant, and effortlessly responsive. Classic tone, modern execution.
Authority
Focused design, timeless voice.
The B·4 channels the unmistakable presence of the classic Precision bass: that deep, unwavering tone that anchors every mix. Its design refines that power into a more comfortable, balanced instrument, with a lighter footprint and improved upper-fret access. Each note speaks with definition and confidence, whether delivering smooth soul lines, articulate modern grooves, or powerful rock-driven fundamentals. From its compact body geometry to its carefully tuned resonance, the B·4 is an instrument that commands the low end with effortless precision.
Simplicity
Modern construction, enduring control.
Built upon Belforti’s hallmark precision, the B·4 combines simplicity of concept with depth of execution. Its no-heel neck joint allows complete access to all 22 frets, while carbon-reinforced necks ensure unmatched stability and sustain. The invisible fret tangs provide seamless comfort and long-term durability, complemented by a spokewheel truss system for fast, precise adjustment. Available with passive or active electronics, the B·4 maintains perfect clarity and power across tunings and dynamics: built to perform, built to last.
The B·4 takes inspiration from the B·2, but offers a non-offset design.
The B·2 reimagines the Jazz-style bass for the modern player: compact, responsive, and endlessly expressive.
Essential, Masterbuilt, Signature.
The same B·4 at three levels. Every one is built to order, in the woods and specs you choose.
| EssentialFrom $2,700 | MasterbuiltFrom $4,000 | SignatureFrom $5,000 | |
|---|---|---|---|
| Woods | Premium grade | Master grade | Private Stock |
| Top | Not included | Exotic top from the Master Grade Library, following the curve of the armrest | Curved inlayed top from the Private Stock, outlined with a 3 ply purfling |
| Pickguard | Your choice, from a classic 3 ply to a custom print | Faux pickguard in inlayed ebony | Signature matching pickup shells |
| Inlays | Classic inlays, your choice of shape and material | Matching premium inlays from your top, with an ebony outline | Signature inlays, outlined, matching your top |
| Frets | Not included | Not included | EVO Gold |
| Electronics | Classic Electronics, fully passive | Advanced electronic designs, active or passive | Ultra Electronics |
| Options | One of 82 custom colors | Wooden knobs, headstock veneer, matching tuner knobs | Signature tuner knobs, neck inlays, wooden knobs |
Technical Specs
Four, five or six strings, straight or fanned frets.
| 4 Strings | 5 Strings | 6 Strings | |
|---|---|---|---|
| Nut width | 39mm | 45mm | 52mm |
| Width at last fret | 64mm | 76mm | 88mm |
| Fretboard radius (3 options) | Vintage 9"-12" / Balanced 10"-14" / Modern 12"-16" | Vintage 9"-12" / Balanced 10"-14" / Modern 12"-16" | Vintage 9"-12" / Balanced 10"-14" / Modern 12"-16" |
| Neck profiles (5 options) | Small / Medium / Large / 3D Nest™ / 3D Flow™ | Small / Medium / Large / 3D Nest™ / 3D Flow™ | Small / Medium / Large / 3D Nest™ / 3D Flow™ |
| Scale length (3 options) | 30" / 34" / 35" | 30" / 34.5" / 35" | 30" / 34" / 35" |
| Number of frets | 24 | 24 | 24 |
| String spacing at bridge | 18.5mm, equal spacing | 18.5mm, equal spacing | 18mm, equal spacing |
B·4, built so far.
$2,700.00
$2,700.00
$2,700.00
$2,700.00
$3,590.00
$3,590.00
Design your ownB·4.
Build your instrument with our 3D Configurator: real-time preview, weight management, dynamic pricing, AI assistant, and all the options you can imagine, right at your fingertips.