Is bi amping worth it ?

Well , from all the comments so far certainly makes sense to try bi amping.  Doesn’t cost anything to try passive bi amping other than another set of speaker cables. Will try that first and see if any difference .  I have the mono blocks and the pre amp supports two main outs.    Have ordered some additional speaker cables and will try this first and report any difference with this first move , probably this weekend. 
 

thanks again for all comments and advice . Greatly appreciated.  

I’ve tried bi-amping briefly, and I can testify that the quality of the amps makes a difference. Amplifiers designed for Public Address (PA) speakers do not work well with the midrange/tweeter half of a B&W 801Matrix. Maybe if I had turned the volume down on the PA amp. Oh well. I do have a 4-way Pioneer crossover for my next attempt. I expect it will be an exciting adventure, as I expect your’s will be as well. I would anticipate a good deal of time may be spent on ‘dialing it in.’ Good luck. 

If done right, which an active crossover and the right amplification yes definitely.  But if all you plan on doing is using two amps and using the passive crossover inside your speakers, then probably not.

@hardhattg 

I'm not sure what you will accomplish after looking back to your original post. I would need 4 mono amps to do what I'm doing with mine. I don't see how yours would be any different. I use two stereo amps and use vertical bi-amping. It makes a huge difference with my speakers. As I said before, I would never go back to a single amp and I don't think that I would change that opinion even if I did have two hefty mono blocks or a single high end stereo or dual mono amp. I could be wrong but in my system, what i have done serves me the best. You may find completely different results in yours but if you are unsatisfied with your bass response, you owe it to yourself to try it........or at least try something different. Best of luck.

OP:  

I jumped into the discussion about biamping without reading your original text. I think it is smart to step back from purchasing a subwoofer without fully understanding the implications.  

I'm not sure bi-amping will give you enogh benefit, but it's not a zero gain solution either.

An intermediate and often overlooked approach is to improve room acoustics. An overly reflective room will "lack bass."  The real issue isn't that there's not enough bass but that the mid-treble stays around too long and raises our perception of mid-treble output.