The Shuttle series was developed by Genz*Benz for professional players who require a flexible, full-featured bass system that is easily transportable and still sounds great. The heart of the Shuttle series is the lightweight Shuttle 6.0 amplifier design. This 3.75 lb. amplifier is available as a "head only" or in combo versions, such as this one, delivering 375 watts at 8 ohms and 600 watts at 4 ohms. In the combo models, the amp chassis can be easily removed from it's combo "saddle" quickly and carried to another gig in the pocket of your bass case or the available carry bag. The chassis has a handle that makes carrying the other half of the combo, the cab, just as easy to take with you. The head is extremely useful as a standalone unit, with a headphone output that is excellent for quiet, personal practice sessions. You can adjust the volume level and tone you hear with the analog 12AX7 tube preamp, and, using the Post EQ setting on the DI, you can turn the Shuttle 6.0 into an outstanding preamp for recording. It also has an extended range input gain for active/passive sensitivity, effects loop, limiter circuit, LED status indicators, Speakon speaker outputs, tuner out, full XLR direct out interface, aux. input, and a headphone jack The Shuttle 6.0-12T adds a rear-ported, Birch-ply enclosured amp that combines Genz*Benz's GNX12300 neodymium 10" loudspeaker with a custom sourced bullet tweeter with attenuation control for a bass combo that is as versatile as it is pleasing to the ear.