I have been pining over a pair of Imagine B or T with the Imagine C center. I do not necessarily need the Imagine T's but I don't know how long I'd be satisfied with the B's, if I go that route. For my purposes they are very likely all I need, but every now and then I like to pull out the proverbial tape measure.
These are the curves for the T2. Looking at the curves below, I would say that is a fairly easy load to drive despite hovering between 4 and 6 ohms between 50 to 500Hz. Why do I say that? If you look at the phase angle in that frequency spectrum, its very close to zereo so all almost all of the power is delivered to the excursion of the driver instead of burning it off in the reactive parts of the voice coil and the cross over network. If you couple that with the fact that you are rolling off bass at 100Hz and below which is the most difficult part of the frequency spectrum to deliver, I would say you would be OK for these speakers.
Impedance vs frequency
Phase vs Frequency