@highend64 not validated, worth re-checking, have these notes on the Vandersteen 2CI Spec:
¾ inch aluminum dome tweeter, 4 ½ “ plastic cone midrange, 8” cone woofer, and a 10” active cone radiator that handles frequencies below 35 Hz. Fequency response is 28 Hz - 20.125 kHz at + or - 3db. Its impedance is at 7 ohms nominal and 5 ohms minimum, efficiency 88db for 1 watt at one meter.
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AMP: Threshold alternative, Forte’ 1a, or Forte’ Model 3, upgraded and converted:
My Pass/Forte’ Model amp is recently reconfigured to Forte’ 1a, pure Class A 50 watts now. Voltage down, bias up. Has four new 30kuf big power caps, large Torroid transformer, new bridge rectifiers, Cardas binding posts, spade connectors removed. All soldered. Not lean at all, very musical, more grunt, 47c, runs Warm at heat sinks. It’s a giant killer now. Will drive your 2ci, no issues, all goodness :)