I agree with Mitch. At present I am using a Loft active crossover in my signal path. I did this more from for as amplification relief for my tube amps as Swampwalker outlined in his first comments. The other reason I experimented with this was the fact that what money I had invested in it initially, I knew I could recover if the experiment did not yield the results I wanted. I actually would have made a profit since some one offered me his present crossover + the $400 I paid for mine and a second person offered me $700. As for the Adcom I got on E-Bay to run the lows I would more or less broke even if I decided to sell. External active crossover use is pretty rare and many will argue that an added component with an added interconnect in the signal path may produce more ailments that outweigh the symptoms that are cured. So if you are willing to invest the time in trying which may be considerable since you can experiment with different crossover points and if the crossover has a gain control (My Loft does)it will only add to the possibilities. Remember if you decide to try this and once you have it tuned to your liking, pull it out and see if you are still happy without it. When I pulled mine out my music lost some of the dynamics and lower midrange clarity. I did get tiny, tiny bit of smoothness on the upper highs on some recordings so I basically choose my poison.
Good Luck James
Good Luck James