Your Krell ksa-150 would work very well with a passive. I have a Ksa-250 and have gone with passive in my system, the ksa-150 would be even better match than mine. It will not need warm up and will really bring your system to life. I would check out placette passive or Bent Audio passive. I went with the Bent audio unit but the Placette would have been fine also as the will both take your Ksa-150 to a higher level than the active pre's you are thinking about can do. The Bent and Placette units are about the same price and you can get them with as many inputs and outputs as you need, I chose the Bent because I wanted balanced inputs and outputs and the price of the placette goes way up if you want balanced model. You can get remote on both units if you like. The Ksa-150 is not a harsh amp at all so I would not listen to Ehart, as he even states he only knows what he has read about krell amps and thats about what most people know (what they read).
