Is this preamp compatible with my Music Man instrument?

This preamp is designed for Music Man instruments with standard 2-coil passive pickups and four-knob control cavities. It is NOT compatible with 3-coil Sterling style pickups. If your Music Man has a single passive pickup slot and standard battery space, it will fit.

What does the Slap Switch do?

The Slap Switch is activated via the push/pull master volume knob and adds a proprietary percussive texture to your tone. Two trim potentiometers on the circuit board let you preset and customize the slap contour EQ to match your playing style.

How is this powered, and can I get more headroom?

The preamp runs on a single 9v battery, but you can wire two 9v batteries in series for increased headroom and dynamic range. A battery clip and stereo jack are included.

What controls does this preamp have?

Four dedicated controls: bass, treble, midrange, and master volume. The master volume knob is push/pull to activate the Slap Switch, giving you easy access to percussive textures without extra footwork.

Will this change the fundamental tone of my Music Man?

No—the STC-3M4 is engineered for transparent amplification that preserves your instrument's character while adding professional EQ shaping. Low noise and low distortion circuitry ensure clean tone across the entire frequency spectrum.

Seymour Duncan STC-3M4 3-Band Tone Circuits for Music Man (4 Knobs)

The Seymour Duncan STC-3M4 is a complete drop-in active preamp solution for Music Man instruments with passive pickups and four-knob control cavities. Built for session work and studio tracking, this circuit delivers transparent, articulate three-band EQ with minimal noise and distortion—preserving your pickup's character while adding the professional tone-shaping control essential for mixing complex arrangements and multi-track recording.

Electronics & Power

The preamp operates on a single 9v battery, with the option to wire two batteries in series for increased headroom and dynamic range—critical for capturing clean peaks during loud passages without preamp saturation. Low noise and low distortion design ensures pristine amplification across the entire frequency spectrum, compatible with single-coil or humbucking configurations within its range.

Controls & Customization

Four dedicated controls—bass, treble, midrange, and master volume—enable surgical EQ work in the studio, while a push/pull master volume knob activates the proprietary Slap Switch for adding percussive texture and presence to tracks. Two trim potentiometers on the circuit board allow preset adjustment of the slap contour EQ, letting you dial in attack character for different session requirements and tonal palettes.

Key Features

Single 9v battery operation with option to wire two 9v batteries in series for added headroom
Four controls: bass, treble, midrange, and master volume
Push/pull master volume knob for proprietary Slap Switch activation
Two trim potentiometers on circuit board for preset slap contour EQ adjustment
Pre-wired harness with high-quality potentiometers
Black anodized, knurled, dome-style control knobs included
Battery clip and stereo jack included
Designed for standard 2-coil Music Man style pickup only—NOT compatible with 3-coil Sterling style pickups
Dimensions: 4.00" W × 1.50" H × 9.00" D; Weight: 1.20 lbs
Low noise, low distortion circuitry with high headroom
Fits Music Man control cavities designed for one passive pickup with single 9v battery space

This purpose-built preamp combines intuitive three-band tone control with the rugged reliability Seymour Duncan electronics are known for—making it an ideal upgrade for Music Man players tracking and mixing demanding session material that requires clean, articulate active electronics.

Condition	New
Country of Manufacture	United States