Sounds like you just have to find a bigger Pass amp that you can afford. Aleph monos would be ideal.
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I really recommend biamping these speakers using the NHT SA3 bass amp for the bass (it has a volume pot so it is easily integrated with another amp) and then a sweeter amp like the Pass Aleph 30 for the mids and highs... Using the SA3 gives you a lot more opportunity to play with lower powered amps.
The SA3 is no longer in production, but can be found here or on eBay (you could also use a pair of SA2 instead; these are more common).
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.
i used to own a pair of 2.9's years ago. they were on the bright side so i matched them with the macintosh ma-6500 integrated amp with the sa-3 sub amp. nice combination for a small medium room. i would only use the sa-3 amp if you have a small room so you can adjust the bass seperately. since the 2.9 need a lot of power to get them to sound their best, this doesn't work in a small room. in a small room, you can adjust the bass so you cn hear it even if you have a low volume on your preamp. if you don't want to biamp the speakers, look for the classe cap-151, macintosh ma-6900, or a used dk design mk II. any 1 of these will have the power to control the lower octaves. IMO, i would not use a 50 watt integrated with these speakers (unless you biamp with 150 watt monoblocks for the woofers), not enough power. the ma-6500 with 100 watts was not enough and i had a small room.