Seymour Duncan STC-3M3 3-Band Tone Circuit for Music Man

The STC-3M3 is a complete pre-wired active electronics solution engineered for Stingray bass upgrades and compatible single-pickup bass installations. This 3-band circuit transforms a passive setup into a versatile active system with intuitive control layout and minimal noise, making it the go-to choice for players seeking professional-grade tone shaping without major rewiring complexity.

Electronics & Control Layout

The circuit delivers a 3-knob configuration with a stacked bass/treble control, dedicated midrange control, and master volume with push/pull Slap Switch for instant tonal voicing. Two small trim pots on the circuit board allow fine-tuning of slap contour EQ, giving experienced players surgical precision over their sound character.

Tone & Performance

This 3-Band Tone Circuit provides independent control over bass, midrange, and treble frequencies with low noise, low distortion, and high headroom characteristics. The pre-wired harness includes high-quality potentiometers, stereo jack, battery clip, and black anodized knurled dome-style knobs, arriving ready to drop into your instrument with minimal soldering.

Key Features

• 3-knob configuration with stacked bass/treble, midrange, and master volume controls
• Push/pull Slap Switch on master volume for instant tonal alternatives
• Two trim pots on circuit board for slap contour EQ adjustment
• 3-Band active tone circuit controlling bass, midrange, and treble frequencies
• Low noise, low distortion design with high headroom
• Pre-wired harness with high-quality potentiometers and stereo jack
• Black anodized knurled dome-style knobs included
• Battery clip for single 9V battery operation (or two 9V batteries in series for added headroom)
• Compatible with any bass featuring single passive pickup and 3-knob/battery space
• Designed for standard 2-coil Music Man style pickups (NOT compatible with 3-coil Sterling style pickups)

This circuit board delivers studio-quality active tone control in a form factor purpose-built for Music Man bass installations and retrofit applications where space and control count.