Behringer Ultrabass BT108 Bass Amplifier Introducing with portable and compact design, Virtual Tube Technology pumps lots of tube-like, distortion-free bass tones through an 8-inch Bugera speaker, providing for really inspired practice sessions. This 15-watt BT108 also provides you with a dedicated 4-band EQ for tone shaping, a headphone output for private rehearsals, and a CD input for playing along with your favorite music. This Behringer Ultrabass BT108 bass combo amplifier is an amazing-sounding practice companion.