Sire Marcus Miller M6 Headless 5 Blue Swirl

The Swirl Finish: From Custom to Production, a New Step for the M6 Range

Traditionally associated with custom instruments, the Swirl finish is now featured on selected models, including this Sire M6. The M6, highly appreciated since its launch in 2025, is enhanced with this "Blue Swirl" version that highlights the modern identity of the line: performance-oriented material choices, stage-focused design, and electronics crafted to cover a wide sonic range. This version retains the M6 spirit while adding a strong visual signature, ideal for bassists who want to stand out without compromising playability.

Who Is It For? A Modern 5-String Bass Designed for Stage, Studio, and Demanding Styles

Thanks to its 5-string configuration, 24 frets, and very complete active electronics, the Sire M6 Blue Swirl is especially aimed at intermediate to advanced bassists seeking an instrument capable of delivering precise lines, tight lows, and refined tones. It is perfectly suited for styles where definition and dynamics are essential: funk, gospel, neo-soul, pop, modern rock, fusion, and studio contexts requiring quick and effective adjustments. The headless format, combined with the C-profile neck, promotes a stable grip and a sense of control, useful for both fingerstyle and pick playing.

Sound: A Wide Palette Thanks to Pure-H Humbuckers and the Heritage-3 Preamp with Parametric Mids

The sonic personality of this M6 is based on a luthiery foundation and electronics designed for versatility. The combination of mahogany and swamp ash offers an interesting balance: mahogany contributes density and sustain, while swamp ash favors attack and clarity, making notes clear even in a busy mix. The multi-wood mahogany/maple neck enhances stability and supports consistent sustain, complemented by the rosewood fingerboard which provides a slightly softer and more organic response in the highs.

On the amplification side, the Marcus Pure-H Revolution Set (humbucker pickups) delivers a comfortable headroom, with solid lows, present mids, and good capacity to handle effects and strong attacks without compression. The Marcus Heritage-3 with Middle Frequency Control preamp greatly expands possibilities: the Treble, Middle with frequency selection, and Bass controls allow quick sculpting of a snappy, percussive slap tone, a singing midrange for soloing, or a rounder foundation to support a groove. The Volume and Tone controls facilitate instant adjustments in real situations, while the Variation SW switch adds a character option to shift between registers with more contrast.

Technical specifications

Electronics: microphone configuration	HH	Nbrs of frets	24
Category	Headless	Body	Mahogany
Left handed	No	Bridge / tailpiece	Fixed
Strings	Steel	Electronics	Active
Nbr of strings	5	Color	Blue
Top	Ash	Finishing	Glossy
Fingerboard	Rosewood	Hardware	Black

Type	headless electric bass	Nut width	46 mm / 1.81"
Wood	mahogany and swamp ash	Configuration	5 strings
Finish	Blue Swirl	Bridge	Sire Headless Individual Bass Bridge
Construction	bolt-on neck	Hardware finish	black
Profile	C-shape	Pickups	Marcus Pure-H Revolution Set
Number of frets	24	Preamp	Marcus Heritage-3 with Middle Frequency Control
Scale length	25.5" / 648 mm	Controls	Volume / Tone / Treble / Middle/Freq / Bass / Variation SW
Radius	16" / 406.4 mm	Positioning	versatile modern bass, focused on performance and precise settings
Nut	Graphtech TUSQ XL