Glad you sold it. . That's pretty cool.. I've had the 2x35 Rackhead E850 for many years and have done many gigs with it using it as an amp, or plugging preamps or Fractal Ax8 into the 'returns' on it. Love that and had never seen the E860. I would assume by the pics the E860 is a new version of the same amp, but I have no clue! Mine's from the 1990's.
Eric