What's the difference between the STC-2A and passive tone circuits?

The STC-2A is an active preamp that requires a 9V battery and delivers a high-headroom, low-noise signal with dedicated bass and treble controls; passive circuits offer no EQ shaping and work without power. The STC-2A maintains clarity and dynamic range under heavy playing, making it ideal for studio and live work where tone control is essential.

Can I use this with passive pickups?

No, the STC-2A is designed specifically for active pickup systems. It will not work with passive pickups.

What's included in the box?

The STC-2A comes with the circuit board, a prewired 3-knob harness (bass, treble, master volume), blend control, and the ability to run on a single 9V battery or two in series for extended headroom and battery life. Installation requires standard soldering into an existing control cavity.

What is the Slap Switch contour?

The Slap Switch is a proprietary alternative EQ voicing optimized for percussive playing techniques; it's adjustable via onboard trim potentiometers so you can preset the contour to your preference and access it quickly during performance.

Will this fit my guitar's control cavity?

The STC-2A has a compact circuit board design that fits standard control cavity routing used in most guitars with active pickups, but you should verify your cavity dimensions before ordering.

Seymour Duncan STC-2A 2-Band Tone Circuit For Active Pickups

The STC-2A is a high-headroom, low-noise active preamp engineered to deliver clean, articulate EQ control with minimal noise floor—essential for tracking and mixing sessions where transparent tone shaping and maximum dynamic range from active pickup systems define recording clarity. This compact circuit board integrates seamlessly into existing control cavities and offers intuitive control layouts that respond precisely across the full frequency spectrum, capturing every nuance of your playing in the DAW.

Electronics & Signal Path

Built as a 2-band active EQ preamp specifically designed for active pickups, the STC-2A maintains exceptional headroom and clarity through heavy playing dynamics—critical when tracking multiple takes or layering parts in production. The circuit powers from a single 9V battery housed in the control cavity, with the option to wire two batteries in series for even greater headroom and extended battery life across long recording sessions or heavy studio use.

Control Architecture

The prewired harness provides dedicated bass and treble controls alongside a master volume control and blend control for versatile pickup mixing—allowing you to dial in your tone at the source before committing to tape or digital. Two small trim potentiometers on the circuit board allow users to preset the proprietary Slap Switch contour, enabling quick access to an alternative EQ voicing optimized for percussive playing techniques and dynamic articulation, perfect for multiple tracking approaches within a single session.

Key Features

High-headroom, low-noise 2-band active EQ preamp
Dedicated bass and treble tone controls
Master volume control
Blend control for active pickup mixing
Proprietary Slap Switch with adjustable contour via onboard trim pots
Prewired 3-knob harness for simplified installation
Single 9V battery power with option for dual-battery series configuration
Compact circuit board design fits standard control cavity routing
Transparent signal path preserves pickup character and dynamics

The STC-2A delivers studio-grade tone control and switching capability in a format that integrates directly into active pickup systems without compromise to signal integrity or noise performance—keeping your recordings clean and your tracking sessions focused on the performance.

Condition	New
Country of Manufacture	United States