- 25W, 1-8 in. speaker, bass combo, solid-state chassis with a digital power amp, single channel, top black control panel, one input, four black knobs (g, t, mid, b), aux. in jack, headphones jack, power switch, black covering, black grill...

- 200W, 1-12 in. speaker, bass combo, solid-state chassis with a digital power amp, single channel, top silver control panel, two inputs (passive, active), five black knobs (g, t, hi-mid, low-mid, b), contour on/off switch, aux. in jack, he...

- 300W, 1-15 in. speaker with a high frequency transducer, 8 ohm impedance, Speakon speaker jack, horn on/off switch, black covering, black grille, 23 in. wide, 19 in. tall, 14.5 in. deep, 35 lbs., mfg. 2014-present.

- 500W @ 4 ohms (350W @ 8 ohms), lightweight bass head unit, hybrid chassis, preamp: 3 X 12AX7, power: solid-state, two channels, front black control panel, single input, nine black knobs (g1, g2, c, t, h/m, l/m, b, MV A, MV B), 14 dB pad s...

- 800W @ 4 ohms (500W @ 8 ohms), light-weight bass head unit, solid-state chassis, single channel, front silver control panel with two chrome handles, single input, nine black knobs (g 1, g 2, c, t, hi-mid, low-mid, b, level, MV), -10dB pad...

- similar to the MB² 500 Head, except in combo configuration with 2-12 in. neodymium speakers, black covering, silver metal grille with GK logo, 39 lbs., mfg. 2008-09.

- 800W, 4-10 in. Neodymium speakers, available in 4 or 8 ohm impedance, one Speakon and one regular 1/4 in. jack, black covering, silver metal grille, 23.5 in. wide, 24.5 in. tall, 14.75 in. deep, 41 lbs., mfg. 2010-disc.

- similar to the MB150E-III Head, except in combo configuration with 1-12 in. speaker, black metal grille, 26 lbs., disc.