Is bi amping worth it ?

Gemoody 

that looks like the perfect crossover  . Inexpensive enough to give it a try.  
 

namrider1 

I did reach out to Greg last year when I had vintage khorns .  Were going to upgrade all Component’s with volti and then I can across an opportunity to trade my vintage horns in on a new pair of horns and did that.  The new enclosed horns were much improved over the vintage , especially the bass.   Not looking to upgrade these speakers ( as yet )   
 

I see where if you buy direct from REL they give you a 60 day trial.    I may try a set of the classic 99 . I admit I like the way they look cosmetically ( already have a large  black box subwoofer for theater)  just hoping they will add enough.   Seems two of them should. ? One to each mono block 

Klipsch now sells a product with an electronic crossover.welcome to the modern age. I like mine and bi and tri amp alot of hard to drive speakers. Klipsch are very efficient and do not normally need that. Crites works with alot of updates on klipsch speakers. You may need some subs and these days some have built in room correction I think svs is one.enjoy the hunt.

@OP - am I correct that your loudspeakers have two sets of speaker terminals for bi-wiring/biamping. If that is the case you don't need a separate crossover - you will just be passively biamping, feeding the signal from your preamp to two separate sets of amplifiers.

However, as I regularly say here, you have to consider opportunity cost. What would a better amplifier sound like versus a bi-amped set?

As mentioned by other posters, Klipsch's do not need lots of watts so I would be inclined to believe that better watts would be preferable to more watts.

@yoyoyaya 

yes these speakers are set up for easy bi amping . 
 

better quality power. ?  I know there is better of course but I would have thought the McIntosh 601 monoblocks and McIntosh tube pre amp would be of sufficient quality power 

@OP. Your preamp has multiple pre outs, so you can easily bi-amp without an additional crossover.

The pre and power are perfectly fine, though a high quality solid state class amp of lower power would be a better match for the speakers. I say solid state because the speakers have a very demanding modulus of impedance in the bass.

However, from your description of what you are trying to achieve sonically, the problem is that the speaker is quite uneven in the mid to upper bass and has a very rapid falloff lower down. Bi-amping is not really going to help you because it's not going to correct or even ameliorate the fundamental issues in the bass referred to above.