Bass, Mid, & Treble controls are all on a single board!The B30EQ Control is designed for contouring the bass, mid and treble frequencies of bass guitar. The B30EQ features single-pole filters for broadband equalization at 6db per octave. Often the broader single-pole filters are preferred for musical instruments because they are less selective, easier on the ear, and sound more “musical”. The B30EQ control is ideal for EMG passive pickups. These EQs have been a favorite of top Bass builders for years, now available direct to you.