The Complete Atelier Z Bass Price Guide 2026: M#245, M#265, Aoki Tomohito, Bartolini XTCT, and Used Values

Last updated: September 2026

Handcrafted in Tokyo, Japan by Days Corporation and master builder Masashi Sugimoto, Atelier Z is globally recognized as the ultimate benchmark for modern slap bass.

Founded in 1989, Atelier Z revolutionized electric bass tone through its historic collaboration with the late Japanese fusion legend Tomohito Aoki. Together, they codified the quintessential Japanese slap recipe in the iconic M#245 (4-string) and M#265 (5-string): heavy selected 2-piece white ash bodies, precision low-action fretwork, proprietary high-output JBZ pickups, and Bartolini XTCT active preamps wired with Atelier Z's legendary Spectrum Boost circuit.

Whether you are looking to acquire a classic Natural Ash M#245, an extended-range M#265 with bone-crushing low-B definition, a versatile 24-fret Beta 4 / Beta 5, or an ultra-compact Baby Z short-scale, this 2026 fair market valuation guide breaks down real secondary prices, specs, and essential pre-purchase inspection points.

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Atelier Z Market Overview 2026

Atelier Z instruments command immense respect among session musicians, funk bassists, and J-Rock virtuosos worldwide. Because the brand produces relatively small boutique batches each month in Tokyo, secondary demand across Reverb, Digimart, and TalkBass Classifieds remains exceptionally vibrant.

Key Market Statistics (2026 Secondary Real Data):

• Average Used Atelier Z Bass Price: $1,680 (up 4.6% year-over-year)
• Active Secondary Listings: ~160 instruments globally across Digimart, Reverb, and Ishibashi / Ikebe Gakki
• Monthly Sales Velocity: ~38 instruments sold monthly
• Price Range: $780 (used Baby Z short-scale or player-grade Beta) to $3,800+ (Custom Order exhibition quilt/flame maple with ebony fingerboards)
• New vs. Used Price Spread: Clean pre-owned M#245 and M#265 models typically save buyers 30% to 40% compared to new Japanese import street pricing ($2,400 – $3,200).
• Pawnshop Liquidation Floor: $650 – $850 for player-grade 4-strings; $950 – $1,200 for clean 5-strings.
• Top Value Drivers: Heavyweight White Ash body weight (4.3kg–4.8kg preferred for slap punch), Bartolini XTCT with Spectrum Boost vs. standard preamps, Badass II vs. Atelier Z high-mass bridge, 5-string vs. 4-string, and matching headstock custom colorways.

┌────────────────────────────────────────────────────────────────────────┐
│                   Atelier Z Price Tier Breakdown 2026                  │
├──────────────────────────┬──────────────────────┬──────────────────────┤
│ Tier                     │ Core Models          │ Used FMV (USD)       │
├──────────────────────────┼──────────────────────┼──────────────────────┤
│ Custom Order / Deluxe    │ Mastergrade Top, 6st │ $2,400 – $3,800+     │
│ Flagship M#265 (5-Str)   │ M#265, M#265 Plus    │ $1,750 – $2,350      │
│ Flagship M#245 (4-Str)   │ M#245, M#245 Plus    │ $1,450 – $1,950      │
│ Beta 24-Fret Series      │ Beta 4, Beta 5       │ $1,250 – $1,750      │
│ Artist Signature         │ Jino, KenKen         │ $1,500 – $2,200      │
│ Baby Z Short-Scale       │ Baby Z 4J / 4P       │ $780 – $1,050        │
└──────────────────────────┴──────────────────────┴──────────────────────┘

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What Makes Atelier Z Basses Unique?

1. Deliberate Heavyweight White Ash Construction: Unlike manufacturers that prioritize lightweight tonewoods, Atelier Z intentionally selects high-density 2-piece White Ash (typically yielding total bass weights between 4.3kg and 4.8kg / 9.5–10.5 lbs). This high acoustic mass prevents low-frequency energy dissipation, resulting in the lightning-fast transient slap attack and deep scooped sustain that defines modern funk.
2. Bartolini XTCT Preamp with Spectrum Boost: The heart of the Atelier Z tone is the 2-band Bartolini XTCT active module wired with a proprietary internal EQ curve (Spectrum Boost). It creates a surgical scoop in the boxy 500Hz region while boosting glassy highs (above 4kHz) and seismic sub-bass (around 40Hz).
3. Plexiglass Finger-Rest Pickguard: The clear acrylic pickguard is precision-machined to standard heights, acting as a built-in slap ramp that prevents players' fingers from digging too deeply beneath the G and D strings during rapid double-thump and popping maneuvers.
4. Master Fret Dressing for Low Action: In Days Corporation's Tokyo workshop, frets are leveled and crowned to accommodate string heights as low as 1.2mm–1.5mm at the 12th fret without dead buzz, enabling effortless tapping and rapid fusion scalar runs.

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Benchmark Atelier Z Models & Valuation Breakdown

1. Atelier Z M#245 (4-String Slap Standard): $1,450 – $1,950 Used

The quintessential slap bass, forever linked to Tomohito Aoki's iconic sound.

• Specifications: Selected 2-piece White Ash body, maple neck with 20 frets and black block/binding, 34-inch scale, Atelier Z JBZ-4 pickups, Bartolini XTCT preamp with active/passive push-pull volume, Badass II or Atelier Z BB419 high-mass bridge, clear pickguard.
• Tone Profile: Explosive, percussive slap attack with crystalline highs and thunderous bottom end. In passive mode, it delivers woody, punchy 70s Jazz Bass growl.
• Fair Market Value:
  • Clean Used M#245: $1,450 – $1,950 (New Street: ~$2,350 – $2,700)
  • Plus Version (with center mini-humbucker): $1,650 – $2,100
  • Early 1990s Badass II Era: $1,600 – $2,050
• Market Benchmark: Search live Atelier Z listings on Reverb or Digimart for current listings.

2. Atelier Z M#265 (5-String Benchmark): $1,750 – $2,350 Used

One of the most stable and articulate 5-string basses ever produced in Japan, solving low-B floppiness on a standard 34-inch scale.

• Specifications: Selected 2-piece White Ash body, maple neck with 20 frets, 18mm or 19mm string spacing, Atelier Z JBZ-5 pickups, Bartolini XTCT active circuit with rear trim adjustments, high-tension bridge anchoring.
• Tone Profile: Incredible low-B note definition. Fundamental low frequencies remain tight and punchy without the muddy boom common to lesser 5-strings.
• Fair Market Value:
  • Clean Pre-Owned M#265: $1,750 – $2,350 (New Street: ~$2,750 – $3,200)
  • Deluxe Flame/Quilt Maple Top: $2,200 – $2,850
  • Player Grade: $1,400 – $1,650

3. Atelier Z Baby Z 4J (Short-Scale Travel / Studio): $780 – $1,050 Used

A 30-inch short scale that sacrifices none of the full-scale Atelier Z active punch.

• Specifications: Ash or alder body, 30-inch scale maple neck, rosewood or maple board, dual JBZ single-coils, active Bartolini or Atelier Z 2-band preamp.
• Tone Profile: Snappy, agile, and remarkably big-sounding; an ideal solution for smaller-handed bassists and touring session musicians needing a compact travel instrument.
• Fair Market Value:
  • Clean Pre-Owned: $780 – $1,050 (New Street: ~$1,250 – $1,450)
  • Player Grade: $650 – $750

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Pre-Purchase Inspection Checklist for Used Atelier Z Basses

When buying a used Atelier Z bass, examine these brand-specific technical checkpoints:

1. Verify Instrument Total Weight: Because heavy ash is fundamental to the M#245 sound, weigh the bass. Legitimate M#245 models should weigh between 4.2kg and 4.8kg (9.2–10.6 lbs). Unusually light ash models (under 3.8kg) may be custom chambered or basswood variants, which alter the fast slap transient response.
2. Inspect Frets 1 through 7 for Slap Indentations: Heavy slap players frequently subject the first seven frets to intense string slapping. Check for deep fret notches beneath the E, A, and D strings that cause open-string or low-fret buzz.
3. Verify Bartolini XTCT Wiring & Battery Compartment: Ensure the active/passive push-pull volume operates smoothly without popping through an amplifier. Check the control cavity to verify the genuine Bartolini XTCT black epoxy module and factory Spectrum Boost wiring harness.
4. Examine Bridge Saddle Screws: High-mass bridges (Badass II or Atelier Z BB series) utilize small hex screws for height adjustment. Inspect for stripped hex sockets or frozen rust caused by hand sweat during aggressive palm-muting.

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Frequently Asked Questions

Where are Atelier Z basses made?

All professional Atelier Z instruments (M#, Beta, Dalziel, Baby Z, and Custom Shop guitars) are handcrafted in Tokyo, Japan by Days Corporation luthiers.

What is the Google Product Taxonomy for Atelier Z instruments?

The exact Google Product Taxonomy is Arts & Entertainment > Hobbies & Creative Arts > Musical Instruments > String Instruments > Guitars > Bass Guitars.

How can I date an Atelier Z bass?

Atelier Z stamps serial numbers on the back of the headstock or neck plate. The initial digits or workshop ledger records correspond to production batches; contacting Days Corporation Japan with the 6-digit serial number allows official factory verification of build year and original custom specifications.