Seymour Duncan STC-3M4 - PREAMPLI 3 BAND ACTIVE + 4 POTARDS
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Manufacturer Information
Seymour Duncan
https://www.seymourduncan.com
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Algam SAS
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The STC Active Tone Signature: A Seymour Duncan Upgrade
The Seymour Duncan STC Active Tone circuit was developed to offer bassists truly useful active equalization: effective settings, musical behavior, and real headroom to shape the sound without altering its character. The STC-3M4 follows this "plug and play" logic: you gain control, presence, and versatility, whether in rehearsal, on stage, or in the studio.
Who It's For and What It Does: From Clear Sound to More Defined Grain
This bass preamp is aimed at musicians who want to adapt their sound to every context : reinforce the foundation in a busy mix, scoop the mids for cleaner slap, or add brightness to stand out better with fingers or pick. It's also an excellent choice if you're looking for coherent and stable electronics for an active Musicman-style bass, while maintaining simple handling via the 4 potentiometers.
3-Band Active EQ: Precision, Balance, and Dynamics
The STC-3M4 features an active tone circuit allowing you to boost or cut high, mid, and low frequencies specifically selected for electric bass. This approach makes corrections more pronounced and controlled than passive tone controls, particularly useful when changing amps, cabinets, string sets, or musical styles. Thanks to its transistor design, the preamp aims for a reliable and consistent response, with reactive and easy-to-dose equalization.
Technical specifications
| Category | electric preamp |
| Effects loop | No |
| EQ | Yes |
| Headphone output | No |
| Color | Black |
| Technology | Transistors |
Questions frequently asked
Does the STC-3M4 allow for midrange adjustment?
The 3-band active equalizer enables boosting or cutting highs, mids, and lows.
Is the Seymour Duncan STC-3M4 compatible with Musicman basses?
This electronics module is designed for an active Musicman-style bass. The 4 included potentiometers provide direct access to the settings. No other mounting compatibility is specified.
What sound does this 3-band active preamp provide?
Thanks to the active controls, it is possible to reinforce the mix foundation, scoop mids for slap playing, or add brightness to fingerstyle and pick attack. The frequency ranges are tailored for electric bass.
Does it have an effects loop or headphone output?
The STC-3M4 does not include an effects loop. No headphone output is indicated.
What technology does the Seymour Duncan preamp use?
The design is based on transistor technology, claimed to offer a smooth response and responsive equalization.



