The BTS System HZ is a complete control system for passive pickups or EMG HZ bass pickups. It includes an Active Balance Control which features buffered inputs for a higher impedance pickups. The additional Controls are a 2-band equalizer for bass and treble that features single-pole filters for broadband equalization. Often the broader single-pole filters are preferred for musical instruments because they are less selective, easier on the ear, and sound more "musical". One of the features of the BTS Control is a 2-position dip-switch that controls the slope of the high frequency response. By choosing one of the four combinations the high frequency response can be tailored to your liking. Bass and Treble controls are mounted on separate shafts and knobs. Also included are a Master Volume control, output jack, battery buss and clip.