MB200
With it’s substantial 200 watt output power, tiny footprint and incredible 2 pound weight, the MB200 is the ultimate in grab and go amplification. Featuring a 4 band active EQ and contour, XLR output, headphone/line output, auxiliary input and Speakon output, the MB200 is the ideal solution in the studio or on the stage. Download Product Manual | Download Product Review

MB500
Weighing in at less than 4 lbs. and taking up less than one rack space, the MB delivers 500 watts of power in a package that will easily fit into your gig bag. Featuring GK’s legendary four-band active EQ and contour control, the MB500 allows you to tweak your tone before hitting the digital power section. In addition to the generous tone shaping capabilities, the preamp section also features a footswitchable boost channel with independent volume control to dial in just the right amount of grind and level boost when needed. Download Product Manual

MB Fusion
The MB Fusion combines the all tube preamp of the Fusion series (without motorized controls) with the ultralight power amp found in the MB500. In addition to the identical tone shaping capabilities of the Fusion series, two footswitchable gain and master volume controls make the MB Fusion the ultimate in portability, tube tone and functionality. Download Product Manual

MB800
Continuing the evolution of the MB series, the MB800 features incredible output, increased functionality and a completely discreet FET (field effect transistor) driven preamp. With 800 massive "GK watts" of power, the MB800 can handle even the largest venues without breaking a sweat, and at 4.9 lbs. neither will your roadie. All of the controls of the MB800 are lit to indicate the current operating status including; input clip, tuning mute, Gain A, Gain B/Level-B, power amp clipping, limiter enable and EQ/Contour settings. The same FET
technology used to create the legendary boost (G.I.V.E.) circuit found in all GK amplifiers for over 30 years is used in every stage of the MB800 preamp. Using FET devices to drive the GK four band active EQ, Contour and Gain allows the MB800 to transition seamlessly from a full, warm, clean tone to full on GK growl.