Seymour Duncan STC-3PSB Fundamental 3-Band Tone Circuit For Passive Pi

Seymour Duncan STC-3PSB Fundamental 3-Band Tone Circuit For Passive Pickups

The STC-3PSB is a compact active preamp circuit that transforms passive pickup systems with responsive, articulate tone shaping. Its intuitive control layout and straightforward operation integrate seamlessly into recording workflows, enabling precise tonal capture without complexity or bulk.

Recording & Tone Shaping

This 3-band active EQ preamp delivers high headroom and low-noise performance across a full range of frequencies. The circuit provides independent control over bass, treble, and midrange response, allowing surgical adjustment of your passive pickup's character during tracking and mixing. The master volume and blend controls manage overall level and pickup balance, ensuring clean signal transfer to your interface or mixer.

Circuit Design & Power

The STC-3PSB runs on a single 9V battery, with the option to wire two batteries in series for added headroom in high-output applications. Black anodized knurled dome-style knobs provide tactile feedback and professional appearance, while onboard trim pots allow preset frequency contour adjustments for fine-tuning the EQ curve to match your studio's acoustics and recording chain.

Key Features

• Designed for use with passive pickups
• 3-Band active onboard EQ preamp with high headroom, low-noise design
• Controls: bass, treble, midrange, master volume, and blend
• Frequency contour switch engaged by pulling up the volume control
• Two trim pots on circuit board for preset frequency contour EQ adjustment
• Single 9V battery power requirement
• Two 9V batteries can be wired in series for added headroom
• Black anodized, knurled, dome-style knobs

The STC-3PSB delivers professional-grade tone control in a compact form factor, making it an excellent choice for producers and engineers seeking transparent EQ shaping and session versatility without unnecessary features or noise.