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Double Bass GK MB200 + Full Circle input impedance?

You don't need a buffering preamp with GK amps, especially not when using Full Circle or Realist pickups.
You may, however, want a preamp if you need to go really loud - in that case it's great to have a phase switch or HPF, provided for example by the Fdeck's great preamp, to fight with feedback.
For low / medium volume I would recommend to go straight into the amp, it's easy and fine sounding.