Seymour Duncan Blackouts Bass Preamp Concentric w/ 2-Band EQ

The Seymour Duncan Blackouts® Bass Preamp Concentric adds genuine active EQ to P– or J–style basses without routing or drilling. Built by California craftspeople averaging 21 years tenure, this two–band onboard preamp delivers low noise, low distortion, and high headroom specifically voiced for electric bass. The concentric configuration stacks bass and treble controls into a single pot, replacing a standard tone knob with zero modification required.

The STC–2C–BO model uses a stacked concentric potentiometer to manage both frequency centres from one control point. Bass and treble operate independently, with switchable treble frequency offering two voicing options: a lower setting adds growl and bite to traditional P, J, and Music Man tones, whilst the higher setting delivers crystal–clear top–end clarity suited to modern–sounding full–frequency instruments. The preamp ships pre–wired on a high–quality potentiometer harness, complete with battery clip, stereo jack, and knurled black dome–style knobs.

Compatibility extends beyond Blackouts for Bass pickups to work effectively with any passive pickup set across all musical styles and genres. The frequency response design produces lows that sit deep, clear, and tight, whilst the dual treble centres provide genuine tonal flexibility without brittle character. This architecture suits everything from traditional jazz bass work to modern, high–output applications where punching clarity matters.

Features

• Two–band active EQ with switchable treble frequency centres for tonal versatility
• Concentric stacked potentiometer design fits standard tone knob cavity; no drilling required
• Low noise, low distortion, high headroom signal path
• Pre–wired harness with battery clip and stereo jack connector
• Compatible with P–, J–, and Music Man–style passive pickups
• Knurled black dome–style control knobs included
• Hand–built in California with 21–year average builder tenure
• 21–day exchange period if tone does not meet expectations