Seymour Duncan STC-2ASB Fundamental 2-Band Tone Circuit For Active Pic

Seymour Duncan STC-2ASB Fundamental 2-Band Tone Circuit For Active Pickups

The STC-2ASB is a sophisticated active preamp that delivers responsive, articulate tone shaping with minimal noise and maximum headroom for bass players running active pickup systems. This circuit provides smooth, musical control over your signal chain with an elegant interface that keeps your bass's control cavity uncluttered. The frequency contour switch engages with a simple pull-up action on the volume control, giving you instant access to preset EQ voicings without adding extra hardware to your instrument.

Control Architecture & Operation

The preamp features dedicated bass and treble controls, master volume, and a blend control for managing your pickup mix with surgical precision. The integrated frequency contour switch—accessed by pulling up the volume knob—allows you to toggle between EQ voicings, and two trim pots on the circuit board let you customize the preset frequencies to your specific tonal preferences. This layout requires only three control knobs and a single 9V battery in your instrument's control cavity, maintaining a clean, minimalist aesthetic.

Power & Audio Performance

The circuit operates on a single 9V battery, with the option to wire two batteries in series for increased headroom and dynamic range if your playing demands it. Low noise and low distortion characteristics ensure your signal remains clean and articulate across the entire frequency spectrum, even during aggressive playing or extended high-frequency content. The included high-quality potentiometers on a pre-wired harness and premium black anodized knurled dome-style knobs provide both durability and tactile response.

Key Features

• Bass and treble tone controls
• Master volume control
• Blend control for two active pickups
• Frequency contour switch engaged by pulling up the volume control
• Two trim pots for customizable preset frequency EQ
• Operates on single 9V battery
• Option to wire two 9V batteries in series for added headroom
• Low noise and low distortion design
• High-quality pre-wired potentiometer harness
• Premium black anodized knurled dome-style knobs included
• Complete mounting hardware and battery clip included
• Designed for fretless bass with two active pickups

This preamp delivers professional-grade tone control and signal integrity in a compact, user-friendly package for serious bass players.