The B·2 is Belforti’s modern Jazz-style bass — agile, balanced, and versatile, handcrafted in France. In the Masterbuilt Series it moves up to premium tonewoods, decorative tops, and high-performance electronics, with refined fretwork and a sculpted, player-focused feel.
About the B·25 - Masterbuilt - Tamo
The B·25 Masterbuilt is the upper limit of what Belforti builds — a five-string bass conceived without compromise, where every specification is chosen for maximum musical and visual impact. It is not a configured instrument. It is a built one.
The ash body is topped with a tamo ash cap of exceptional figuring — its wild, swirling grain patterns reading almost like a topographical map across the surface of the instrument. Under a clear gloss coat, the natural cream and amber tones of the tamo shift and move with the light, making this one of the most visually striking tops available in boutique lutherie. A maple neck and rosewood fretboard complete a classic, proven pairing — warm, fast, and immediately familiar under the hands. Rounded block inlays set into the rosewood add a refined visual detail that anchors the instrument's premium positioning without overstating it.
Electronics are handled entirely by Aguilar — AJ5 HOT pickups feeding into an OBP-3 three-band preamp. The pairing is deliberate: the HOT pickups push harder and wider than a standard passive design, and the OBP-3 gives the player surgical control over the full frequency spectrum. Bass, mid, and treble controls respond with the transparency and musicality that Aguilar is known for — shaping tone rather than imposing it.
The B·25 Masterbuilt is a commission instrument. The result of a single conversation between a player and a luthier, built once, built right.
Quick Specs
Number of strings : 5
Scale Length : 34"
Number of frets : 24
Neck Profile : S
Fretboard Radius : Modern 12" to 16"
Top : Tamo Ash
Body : European Ash
Neck : Norwegian Maple
Fretboard : Indian Rosewood
Inlay : Rounded Blocks
Inlay Material : Matching Wood
Core Features
These are the core features common to all Belforti Guitars and Basses :
Founded in Paris, built in Michigan
PLEK Treatment
Rated Tonewoods
No Heel Design
Invisible Fret Tangs
Radiused Fret Slots
Angled Full Length Carbon Reinforcements
Easy Truss Rod Access
Selected Bone Nuts
Choice of Pickups & Electronics
UltraThin Polyurethane
Warranty
Every new Belforti instrument comes with a 5-year limited warranty from the date of delivery, for the original purchaser. It covers defects in materials and workmanship. Electronics, hardware and cases made by other manufacturers are covered for 90 days. Exclusions apply.
Custom instruments: 6 to 8 months. Your estimate confirms the ship window. In-stock instruments ship within the time stated on the product page, or within 30 days.
Delivery
Every instrument ships from our workshop in Big Rapids, Michigan, in a hard case. Shipping is quoted per order and confirmed before dispatch. Every delivery requires a signature. Insurance is available on request.
International orders ship DAP (Delivered At Place). Import duties, VAT and brokerage fees are not included and are paid by the buyer at delivery.
B·25 - Masterbuilt
About this bass
The Marē 5 Masterbuilt is the upper limit of what Belforti builds — a five-string bass conceived without compromise, where every specification is chosen for maximum musical and visual impact. It is not a configured instrument. It is a built one.
The ash body is topped with a tamo ash cap of exceptional figuring — its wild, swirling grain patterns reading almost like a topographical map across the surface of the instrument. Under a clear gloss coat, the natural cream and amber tones of the tamo shift and move with the light, making this one of the most visually striking tops available in boutique lutherie. A maple neck and rosewood fretboard complete a classic, proven pairing — warm, fast, and immediately familiar under the hands. Rounded block inlays set into the rosewood add a refined visual detail that anchors the instrument's premium positioning without overstating it.
Electronics are handled entirely by Aguilar — AJ5 HOT pickups feeding into an OBP-3 three-band preamp. The pairing is deliberate: the HOT pickups push harder and wider than a standard passive design, and the OBP-3 gives the player surgical control over the full frequency spectrum. Bass, mid, and treble controls respond with the transparency and musicality that Aguilar is known for — shaping tone rather than imposing it.
The Marē 5 Masterbuilt is a commission instrument. The result of a single conversation between a player and a luthier, built once, built right.
Each of our instruments is carefully handcrafted in Michigan, USA, using the highest standards of craftsmanship and the finest materials. At Belforti Instruments, we focus on precision and quality to create durable, high-performance guitars and basses that meet the needs of serious musicians. Every instrument is a testament to our commitment to exceptional sound and design
Features
Features
Overview
The Masterbuilt Series is the mid range Series of Belforti's line up. These instruments represent the entry in the world of fine lutherie, with decorative tops, high performance woods and electronics, in a form factor that represents modern lutherie. They are a continuity of the Essential Series design, and bridge the gap between E & Signature Series.
As a part of this Series, this instrument features the following :
Master Grade Tonewoods
The Master-grade woods that are known for their stunning visual appeal as well as their tonal excellence. These aren't just any pieces of timber; they are carefully selected for their aesthetic beauty, tonal richness, and resonance.
All the Master Grade woods are rated between 81 and 90 on the Belforti rating.
Faux Pickguard Aesthetics
The faux pickguard gives the Masterbuilt Series their distinctive look. It maintains this classic look and brings coherence to the design, while preserving the grain pattern. It is made out of inlayed ebony.
We could never put a piece of plastic on these, not even transparent acrylic !
Matching Premium Inlays
Masterbuilt Series fretboard and headstock inlays are exclusively made out of the top wood you chose. They are extracted from the scraps of your top, and they are outline with a black inlayed ebony outline.
Shape
Shape
Marē
The Marē body shape reimagines the Jazz-style bass with compact proportions and refined ergonomics.
Its smooth contours and balanced geometry ensure natural comfort, while the minimalist lines deliver a modern, understated aesthetic that feels timeless on stage or in the studio.
Core Specs
Core Specs
Number of strings : 5
Expanded-range bass adding a low B string. Increases versatility and extended low-end access while maintaining familiar 4-string playability with a slightly wider neck.
Scale Length : 34"
The industry-standard bass scale length. Offers a balanced feel between string tension, playability, and clarity. Ideal for versatile playing styles and compatible with most bass string sets.
Number of frets : 24
Extended-range configuration offering two full octaves per string. Ideal for soloing, technical playing, and modern styles requiring upper-register access.
Neck Profile : S
Slim, fast neck shape with reduced thickness. Optimized for speed, smaller hands, or players seeking maximum comfort and agility.
Radius : Modern 12" to 16"
Flatter fretboard radius for fast playing, low action, and effortless bending. Ideal for technical and contemporary playing styles.
Woods
Woods
Body : European Ash
European Ash combines lively resonance with excellent structural reliability, making it a versatile tonewood for electric instruments. Known for its clear attack and balanced frequency response, it delivers articulate highs, defined mids, and a tight, responsive low end. Its pronounced grain patterns also add natural visual depth, giving the wood a distinctive organic character while supporting strong vibration transfer and long-term stability.
Neck : Norwegian Maple
Maple is a classic neck wood prized for its density, stiffness, and stability. It offers a snappy response and clean vibration transfer. Its medium weight and closed grain provide excellent resistance to warping. Maple is highly reliable for precision neck construction and offers a bright, clean visual aesthetic.
Fretboard : Indian Rosewood
Indian Rosewood is a dense, oily hardwood with a naturally smooth feel. Its open pores provide excellent grip and tactile comfort. Highly stable across climates, it resists wear and moisture absorption. Its dark brown hues often feature subtle figuring, giving fretboards a warm and classic visual appearance.
Options
Options
This is a list of the non standard options featured on this instrument
Matching Headstock
Stainless Steel Frets
Top
Tamo Ash
Tamo ash — Japanese ash — produces some of the most dramatic figuring found in any tonewood. Its defining characteristic is a dense, turbulent grain pattern that swirls and folds across the surface in tight, unpredictable formations, creating a visual effect closer to abstract art than conventional wood figure. No two tamo tops share the same pattern, and highly figured pieces are considered among the most sought-after cap materials in boutique instrument building. Tonally, it contributes the brightness and definition characteristic of ash family woods — clear, present, and well-articulated across the full frequency range.
Lovely Curves
Masterbuilt Series tops are bent on the armrest which keeps intact the beautiful grain as well as creating an ergonomic and delicate curve to rest on.
Electronics
Masterbuilt instruments feature advanced electronic designs and premium pickups from some of the finest manufacturers in the world. Their circuitry is conceived for power, precision, and tonal versatility — not limited to any particular style, but capable of handling them all.
Depending on the model, you’ll find active systems on basses, expanded tonal controls, and refined wiring layouts that provide exceptional clarity, responsiveness, and creative range.
Pickups
Aguilar AJ5 HOT
The AJ5 HOT is Aguilar's high-output take on the classic J-style pickup format, voiced specifically for five-string instruments. Wound hotter than a standard passive design, it delivers a stronger fundamental, a more pronounced midrange presence, and a fuller low-B response than conventional J pickups — without sacrificing the clarity and note separation the format is known for. It pairs naturally with active preamps, responding to EQ shaping with precision and musical transparency.
Circuit
Preamp
Aguilar OBP3
TheAguilar OBP-3is a high-performance3-band active preampdesigned to deliverpowerful, flexible tone shapingwith ultra-low noise and crystal-clear signal clarity. Known for itsmusical EQ responseandhigh headroom, it allows bassists to sculpt their sound with precision, from deep, punchy lows to crisp, defined highs.
Layout
Volume
Volume
Bass / Mid /Treble
Mid Switch
What's included
Your instrument
How surprising !
Belforti Premium Gig Bag
Your Belforti deserves proper protection. So it comes with a signature padded gig bag themed after the series you chose.
Sturdy, weather-proof, and oh so cool !
Setup Tools
Your instrument comes completely setup and ready to play. But you might wanna tweak things up a bit later on, so we got you covered !
Certificate of Authenticity
A real Belforti deserves a certificate. Can't fake this up
