Within one year I had two problems with two different GK products. Bought a MB 212 and a MB 112 that both had issues out of the box. GK ended up sending me a new MB 212 and I ended up fixing the MB 112 myself. As much as I like both amps, I will not be buying a GK product again. When
I wrote Brian that I fixed the MB 112, I even gave him my thoughts of what caused the problem. The ON/OFF button was stuck in the ON position. What I found is the opening in the cabinet was too wide for the metal amp chassis. So if the mounting screws are not tighten one side at a time, the chassis twists putting stress on any component attached to both the chassis and the PCB. Thus making the button stuck. So when I loosened the chassis mounting screws and tightened them one side at a time, there was no twisting of the amp chassis and the on/off button worked as it should. I wrote all this to Brian. Have not heard one word back......
Again I am happy with both amps, I just hope they hold up long term. My guess, the QC on their Chinese made products is not up to par with GK,s US made products.
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