Seymour Duncan ASB-2ASB Steve Bailey 6-String Fretless System 2-Band Tone Circuit

The ASB-2ASB is a complete active electronics system engineered specifically for 6-string fretless bass, delivering the harmonic clarity and midrange definition that fretless playing demands. This hand-built Santa Barbara system pairs responsive soapbar pickups with a sophisticated tone circuit designed to unlock the full expressive potential of fretless instruments. The pre-wired harness and integrated controls make installation straightforward for players ready to upgrade their fretless rig.

The 2-band Tone Circuit combines bass and treble controls with a master volume and blend control, all supported by a dedicated frequency contour switch optimized to emphasize fretless harmonics and deliver a mid-range boost. Two trim potentiometers on the circuit board allow for fine-tuning the frequency contour EQ, giving you precise control over the system's character across different playing styles and instrument characteristics.

The system runs on a single 9v battery housed in the control cavity, with the option to wire two batteries in series for added headroom on demanding sessions. With approximately 1,000 continuous hours of battery life per set, the ASB-2ASB delivers reliable, consistent performance through extended playing periods without frequent replacement.

• Neck and bridge active soapbar pickups
• 2-band Tone Circuit with bass and treble controls
• Master volume and blend control
• Frequency contour switch optimized for fretless harmonics and mid-range boost
• Two trim potentiometers for frequency contour EQ customization
• Pre-wired harness with high-quality potentiometers and battery clip
• Black anodized, knurled, dome-style control knobs
• Single 9v battery power (compatible with dual 9v wiring in series)
• Approximately 1,000 continuous hours battery life per set
• Phase I soapbar pickups fit traditional P4 routed 6-string bass (466 x 127 mm)
• Hand built in Santa Barbara, CA

This complete fretless system combines purpose-built electronics with meticulous construction to deliver the articulation, harmonic clarity, and tonal flexibility that serious fretless players require.