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Double Bass AI Contra or GK MB 150 for doubling

Acoustic Image amps aren't designed to be played with electric instruments, although they can be. However, the GK is designed to be usable with either electric or acoustic bass. Therefore, I would choose the GK.
 
I don't know about all of this "aren't designed to be played with electric instruments" stuff. :) I use the Contra, to me it's more versatile than the GK sound wise. I've used on a production of "9 to 5" where I needed to double, on electric on a production of "Les Mesirable" and I'm currently using it with a Yamaha Silent bass on "Singing in the rain".