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.

Do I pay sales tax on this order?

We collect sales tax only on orders shipped to California. Orders shipped to any other US state are charged $0 sales tax at checkout when you buy direct from our website. On this item that is roughly $12 less out the door than the same listed price at a national retailer or on a marketplace. Marketplaces such as eBay, Reverb and Amazon collect sales tax in nearly every state as marketplace facilitators no matter who the seller is, so the same item at the same price costs less bought direct. Free US shipping and 30-day returns are included. Some states ask buyers to self-report use tax on out-of-state purchases.

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

The Seymour Duncan STC-3M4 is a complete drop-in preamp solution engineered for Music Man instruments with passive pickups and four-knob control cavities. This circuit delivers transparent, articulate tone shaping with minimal noise and distortion, making it a direct replacement that preserves the character of your instrument while adding professional EQ control.

Electronics & Power

The preamp runs on a single 9v battery, with the option to wire two batteries in series for increased headroom and dynamic range. Low noise and low distortion design ensures clean amplification across the entire frequency spectrum, This running single-coil or humbucking configurations within its compatibility range.

Controls & Customization

Four dedicated controls—bass, treble, midrange, and master volume—give you surgical tone shaping capability, while a push/pull master volume knob activates the proprietary Slap Switch for instant percussive texture. Two trim potentiometers on the circuit board allow preset adjustment of the slap contour EQ, letting you dial in your preferred attack character.

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 preamp combines intuitive tone control with the rugged reliability Seymour Duncan electronics are known for. On stage, the responsive EQ shaping cuts through the mix, the Slap Switch delivers instant textural variety for dynamic performance, and the low-noise design keeps your signal clean throughout a gig. Built for touring musicians and players who demand dependable active electronics.

Condition	New
Country of Manufacture	United States