Shocked One: Thanks for the suggestion, but I am actually not looking for more bass. The Krell Phantom is even better than the Krell KRC, and with the 750mcx, Playback Designs, and SC-VIs the bass is incredible, best I have heard.
There is a Krell dealer who told me he experimented with Dunlavy bi-amping (not the SC-VI) and said I should expect better definition, more control, and better soundstange if I actively bi-amp the SC-VIs.
Champ04: It is great you have modeled the other crossovers.
The users manual of the Krell Phantom says the crossover can be set to: The options are: HIGH PASS, LOW PASS, FREQUENCY, 40Hz, 55Hz, 75Hz, 100Hz, BYPASS, FILTER, BUTTERWORTH, 12dB, 18dB, 24dB, or 24dB Linwitz-Riley. Additionally normal or inverted phase.http://www.krellonline.com/downloads...0Reference.pdf
So, it does allow for 12db Butterworth, which I understand is the type used in the Dunlavys. However, it only allows 40hz, 55hz, 75hz and 100hz options for the hi-pass and low-pass filters, and only normal and inverted phase. Do you think those options are sufficient?