I have the 2.5i's and have found that a quality 50 watt integrated bested a 140 watt bi-amp configuration. Audition an Audio Refinement Complete if you get the chance. A little Creek or Music Hall may also work well. At low volumes an inexpensive tube amp from Jolida sounds wonderful. If you have a little bigger budget try a YBA integrated.
If you want to bi-amp you need no special active crossover or anything. All of that is built into the crossover of the speaker.
Good luck!
If you want to bi-amp you need no special active crossover or anything. All of that is built into the crossover of the speaker.
Good luck!