From Mesa Boogie:
The M6 CARBINE expands the MESA® Family of Bass amplifiers with an exciting new voice that’s super fast and extremely focused! The output section relies on the same time-proven array of custom designed mosfets used in our M-Pulse, Big Block and Titan models, but the preamp and driver section are all new creating a very different feel and attitude.
Up front the tube preamp utilizes a standard tone control string of Bass, Mid and Treble to shape the basic sound, but the shaping power doesn’t stop there.
The CARBINE also features a new VOICE control for instant access to global character changes. Here you’ll find four iconic and distinctively different sounds and a bypass on a 5 position rotary pot that graphically shows you the EQ curve for each. To the left, positions 1 and 2 dip the midrange in two different places giving you two amazing choices for classic round, warm R & B sounds. Turning right past the 12:00 noon FLAT position unveils two variations on the mid-bump theme. Positions 4 & 5 boost adjacent mid regions to create two powerful mid focused sounds that push articulate fingerstyle playing to the forefront of any mix or add the tight drive to Rock. The VOICE Feature can also be triggered remotely via the EXTERNAL SWITCH jacks located on the Rear Panel. Great Tone doesn’t get any simpler!