What Is a 12 String Bass Guitar and How Does It Work?

A 12 string bass guitar is an electric bass with six paired string courses — each bass string has a thinner octave string that sounds with it, adding brightness and depth.

Pluck one note and you hear two: the fundamental bass tone plus an octave shimmer. Each of the six courses pairs a conventional bass string with a thinner companion tuned an octave above, producing a chorus-like thickness a standard four-string cannot reach. This is not a 12-string guitar in bass clothing — the two share a string count and almost nothing else.

How Does The Paired-String System Work?

Each course holds two strings played as a single unit — the lower supplies the bass register, the thinner one adds an octave-above component and harmonic density. A specialized bridge provides 12 individually correct string positions with stable intonation, which is why these bridges look like machined assemblies. Pickups sense the combined vibration; from there the signal path is ordinary bass electronics: magnetic pickups feed volume and tone controls, an amplifier, and optionally onboard active circuitry.

A specialist historical account reports that Tom Petersson of Cheap Trick initially wanted an improved eight-string bass in 1977, and Hamer developed 10- and 12-string designs from there. On tuning: exact tuning varies by model and player, and no single universal tuning is documented across available sources — treat any claim of one standard tuning with suspicion.

Which 12 String Bass Models Are Available Today?

Three models anchor the current landscape: the Schecter Stargazer-12, the Dean Rhapsody 12, and the Gretsch Custom Shop Tom Petersson Signature White Falcon.

The Schecter Stargazer-12 runs a mahogany body with a three-piece maple neck, maple fingerboard, and thin “C” profile. Its 34-inch scale, 16-inch fingerboard radius, and 24 jumbo frets feel familiar to four-string players. Electronics include a Schecter USA M-25 bridge pickup and J-25 neck pickup, with volume, blend, and tone controls. Two mini-toggles handle bridge-pickup series/split/parallel operation and neck-pickup coil tapping. TonePros M-Series tuners, a 52 mm graphite nut, and an adjustable 12-string bridge round it out. The hardshell case is listed separately.

The Dean Rhapsody 12 is reported to use a 34-inch scale with 24 frets, a maple-and-walnut bolt-on neck, rosewood fingerboard, dual humbuckers, EMG-HZ pickups, and a Dean 3D preamp. It requires specialized 12-string bass string sets — standard bass strings will not fit the paired layout.

The Gretsch G6136B-TP12 Custom Shop Tom Petersson Signature White Falcon sits at the collector end. That price list is marked 2025, and custom-shop pricing can shift, so confirm with a dealer before budgeting.

What Should You Know Before Buying Or Setting One Up?

The setup rules are stricter than on any ordinary bass, and the first is non-negotiable: use a string set made specifically for a 12-string bass. Ordinary four- or five-string sets lack the correct count, gauges, and octave pairings.

When replacing strings, work carefully and gradually. Twelve strings create substantially more combined tension than a conventional bass, and pulling every string off at once may destabilize the neck or bridge. No manufacturer-specific replacement sequence is documented, so change them a few at a time. Tune each course as a paired unit with an accurate chromatic tuner, checking both strings independently — plucking both at once can make the tuner misread the composite sound. After restringing, verify neck relief, action, nut slots, bridge height, and intonation; forcing incorrectly sized strings into slots causes binding, tuning instability, or real damage.

Amplification is broadly compatible with ordinary bass amps, though the extra harmonic content pushes more treble energy. Start conservatively. To compare instruments side by side, this roundup of tested 12 string bass guitar models breaks down current options.

Do not confuse this instrument with a 12-string guitar. Hagstrom’s historical 12-string guitar models used a 25.5-inch scale — a different world from the Schecter bass’s 34-inch scale. Scale lengths, tuning, string gauges, bridges, and pickups are not interchangeable. The official history of the 12-string bass traces how the design developed from Petersson’s original request.