Behringer ultrabass bt108 amplifier behringer bt108 p the behringer ultrabass bt108 is a nbsp super compact 2 channel 15w bass amp designed to match the needs of bass guitarists looking for great classic tube like sounds in a small package with a small price p p it lends itself to a wide variety of applications in which you need to keep the size down without compromising on the quality p p vtc virtual tube circuitry gives the bt108 truly tube like sound and you can rely