Description

The Sire M6 Headless 4 in Blue Swirl takes the acclaimed modern M-series platform and gives it a striking custom-style makeover. With its lightweight headless design, premium active electronics and eye-catching Blue Swirl finish, this bass is built for players who want cutting-edge performance and a bold stage presence in a compact, travel-friendly package.
Combining a sandblasted mahogany and swamp ash body with a fast 5-piece maple and mahogany neck, the M6 Headless 4 delivers a responsive, articulate tone with excellent balance and sustain. The Marcus Pure-H Revolution pickups and Marcus Heritage-3 preamp provide a huge range of usable sounds, from tight, punchy funk to deep, modern low-end, all easily shaped via the intuitive control layout.
The headless construction not only reduces weight but also improves balance, making long rehearsals and gigs more comfortable. Paired with Sire’s Edgeless rolled fretboard edges and stainless steel frets, the M6 feels smooth and effortless under the fingers, encouraging fast, precise playing across all 24 frets.
The Blue Swirl finish, traditionally reserved for custom instruments, has been carefully tested and refined to meet Sire’s quality standards. The result is a unique, matte-look aesthetic that stands out under stage lights without being overbearing, giving you a bass that looks as modern and expressive as it sounds.

Striking Blue Swirl Finish
The Blue Swirl finish brings a custom-shop vibe to the M6 Headless line, with each instrument displaying its own unique patterning. The matte treatment keeps reflections under control while still allowing the swirling colours to pop, giving you a bass that turns heads on stage and in the studio.

Comfortable Headless Design
The Sire headless body shape and individual bridge system keep the instrument compact and well balanced, reducing neck dive and overall weight. This makes the M6 Headless 4 ideal for players who value comfort, portability and a modern aesthetic without sacrificing tone or playability.

Marcus Pure-H Revolution Pickups and Heritage-3 Preamp
The Marcus Pure-H Revolution pickup set works in tandem with the Marcus Heritage-3 preamp to deliver a wide tonal palette. With dedicated controls for volume, blend, bass, middle with selectable mid frequency, treble and a pickup variation switch, you can quickly move from vintage-inspired warmth to tight, contemporary clarity to suit any genre.

Fast Neck with Edgeless Fretboard
The 5-piece maple and mahogany neck with C-shape profile, 16 inch radius rosewood Edgeless fretboard and stainless medium jumbo frets offers a slick, modern playing feel. Rolled fretboard edges reduce hand fatigue and make position shifts smoother, while the 24-fret layout gives you extended range for solos and advanced techniques.

Key Features
Custom-Inspired Blue Swirl Finish – The Blue Swirl finish, traditionally seen on custom instruments, gives this M6 Headless 4 a distinctive, individual look. The matte treatment keeps it classy and stage-ready, helping you stand out visually without compromising on a professional appearance.
Lightweight, Balanced Headless Construction – By removing the traditional headstock and using a compact body shape, the M6 Headless 4 offers improved balance and reduced weight. This translates to greater comfort during long sets and easier transport between rehearsals, sessions and gigs.
Versatile Marcus Electronics – The Marcus Pure-H Revolution pickups and Marcus Heritage-3 preamp with mid frequency control provide a powerful, flexible sound engine. From tight, articulate slap tones to rich fingerstyle warmth, you can dial in precise tones quickly using the intuitive control layout.
Premium Playability with Edgeless Fretboard – The rosewood Edgeless fretboard with rolled edges, stainless medium jumbo frets and a comfortable C-shape neck profile combine for a smooth, modern feel. This encourages clean technique, fast runs and expressive bends across the full 24-fret range.
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