KXB100 The Kustom KXB100 is a 100W bass amplifier with a 15" Kustom speaker and Bass, Lo-Mid, Hi-Mid, and Treble controls. The preamp provides both Gain and Volume controls and is perfect for classic bass tones or more aggressive sounds with a hotter gain structure. For performance flexibility, the Kustom KXB100 provides a balanced XLR Line Out and Ground Lift and Volume control. An effects loop with Send and Return jacks offers flexibility for integrating external effects and processors.