Add active EQ to your P- or J-style bass without any drilling with this 2-band onboard active bass preamp. With separate bass and treble controls via a stacked bass/treble pot, and switchable treble frequency, the Blackouts active bass preamp is versatility made easy. The onboard tone circuits of the Blackouts Active Bass Preamp will instantly add tremendous tonal versatility to your bass. This system enables you to boost or cut EQ at center frequencies voiced specifically for electric bass. It features low noise, low distortion, and high headroom. Although originally voiced for use with Blackouts for Bass pickups, with its switchable treble frequency the Blackouts Bass Preamp works well for all musical styles and genres. The lows are deep, clear, and tight. Because there are two treble frequency centers to choose from you get a ton of flexibility in the high end. The lower treble setting is perfect for adding growl and bite to traditional P, J, and MM tones. The higher setting offers crystal-clear top end to modern-sounding, full-frequency basses and, when used with Blackouts for Bass, provides punishing clarity without being brittle. This two-band active EQ is available in two configurations. The STC-2C-BO is mounted to a concentric potentiometer, and can replace a standard tone knob with no need for additional holes in the bass. The STC-2S-BO separates the treble and bass controls onto two pots. The Blackouts Bass Preamp ships with all necessary mounting hardware: high-quality potentiometers on a pre-wired harness, battery clip, stereo jack, and knurled black dome-style knobs.