Spira Guitars B400 MGR

Essential Information About the Spira Bass SB400 MGR

• HH configuration with active soapbar pickups: two Spira Villian Custom pickups (ceramic) with an active circuit for a modern, powerful, and precise sound.


• "Roasted" woods (poplar for the body, Canadian maple for the neck and fingerboard): more stable feel and clear attack, ideal for articulated playing.


• Modern playing comfort: Modern D neck profile, 24 Jumbo frets, and 14" / 356 mm radius to facilitate speed and contemporary techniques.


• Stage look: satin finish and hardware with a bold style featuring a Metallic Green aesthetic.

SB400: A Modern Vision of the "Performance" Bass at Spira

The Spira Bass SB400 MGR embodies a decidedly contemporary approach to the electric bass: ergonomics designed for long, fatigue-free playing, luthiery focused on stability, and active electronics crafted to stand out in a mix. The idea is simple: to offer an instrument with a modern character, capable of handling lower tunings, strong attacks, and dynamic nuances, while maintaining immediate playability.

With its HH soapbar configuration and "roasted" woods, the SB400 clearly targets bassists seeking a fast response, solid definition, and a coherent instrument for both studio and stage, without getting lost in a complex array of controls.

Who Is the SB400 MGR Made For and What Styles?

Thanks to its Modern D neck profile, 24 Jumbo frets, and long scale 34" / 864 mm, this bass is primarily aimed at intermediate to advanced bassists who want effective playability across the entire neck. The Jumbo frets facilitate bends, strong playing, and fast runs, while the 14" / 356 mm radius promotes low action and smooth transitions.

Its natural playground: modern aesthetics where the bass must remain clear and punchy (contemporary rock, metal, prog, fusion, edgy pop, modern gospel, funky groove). The active circuit and ceramic soapbars deliver a sharp attack and presence that help cut through saturated guitars, while maintaining good precision on fast notes.

Sound: Active Soapbar Pickups and "Tight" Response

The SB400 MGR relies on two custom Spira Villian Soapbar pickups with ceramic magnets, paired with an active circuit. This choice steers the tonal character toward a modern reproduction: firm lows, well-controlled low-mids, and a clear attack that highlights fingerstyle, pick, and slap techniques. The soapbars, due to their format, often provide even pickup coverage and a sense of sonic width useful for dense bass lines and chordal passages.

The controls remain intentionally straightforward with 1 Volume and 1 Tone: enough to quickly adjust the sound's openness without interrupting playing. In practice, you can switch from a snappy, defined tone to a rounder, tamer color, while retaining the headroom and impact typical of active electronics.

On the luthiery side, the roasted poplar body contributes to a fast and balanced response, with a clear grain and dynamics emphasizing precision. The neck and fingerboard in roasted Canadian maple reinforce the attack feel and note clarity, with a "snap" ideal for tight riffs and technical parts. Overall, this results in a bass with clean sustain and well-defined note contours, perfect for modern mixes.

Recommended Compatible Accessories

Technical specifications

Left handed	No	Nbr of strings	4
Strings	Steel

Type	electric bass	Nut	Composite Polymer Fibre
Body	roasted poplar	Truss rod	double action
Finish	satin	Number of frets	24
Color / hardware	Metallic Green	Fret type	Jumbo
Neck	roasted Canadian maple	Bridge	fixed
Profile	Modern D	Tuners	black
Fingerboard	roasted maple	Pickup(s)	Spira Villian Soapbar, custom made, ceramic, active circuit
Radius	14" / 356 mm	Controls	1 Volume, 1 Tone
Scale length	34" / 864 mm	Instrument	Bass, HH
Nut width	42 mm / 1.65"