I have been researching the threads on this topic like a good girl and I think I have the gist of this but I am wondering if it is worth it?

I currently have the 7100 and the Polk Lsi series for Center and Fronts. Is it worth getting some Monoblocks to bi-amp these? I am using all 7 outputs of the 7100 already.

Don't waste your time with passive bi-amping or bi-wiring. The differences made by bi-wiring are nil, and passive bi-amping makes little or no difference in the sound.

The only real bi-amping scheme that makes a very audible difference is active bi-amping where the passive crossover network in your speaker is replaceced with a direct speaker driver-to-amplifier connection, and the frequency division is performed by an electronic crossover network before the amps. This route is very labor intensive to do correctly and the use must have the test equipment to properly set a system like this up. That is why it is not offered by manufacturers of consumer systems. It is routine in professional systems though, and all movie theater systems are actively bi-amped.

Ok, Thanks a lot. That saved me some time and $$$$$.

The LSi's are rated as a 4 ohm load, so the 7100 is giving you 165W - which should match up pretty well with the speakers (the recommended power for the LSiC and some of the other LSI's is 20W-200W, while the LSi15 is 20W-250W). If you decided to add monoblocks (such as the Outlaw Model 200, which can provide 300W into a 4 ohm load) for the main speakers, I'd let the monoblocks handle the load by themselves rather than bi-amp with the 7100.

Hmmmmm. That is an interesting idea. Would I hear any improvement on the 15's with the Monoblocks to make that worth doing? Maybe I should have purchased the 770 instead of the 7100.

Added power does not necessarily translate into a sonic improvement, so I can't say if you would hear any benefit from going from the 7100 to a 770 or monoblocks. I'm not familiar enough with your speakers to know how they behave with different amps, but 165W at 4 ohms is a pretty respectable reserve of power. Monoblocks could offer a little benefit simply by the nature of giving each amp channel its own power supply.

Yes, don't make the mistake I did and buy by amping cables. My polk speakers didn't benefit from it. Just a waste of money as far as I am concerned.
The sound improvement I heard came when I removed the speaker grills, did they seem to come alive. Hard to bleieve I had been listening to them muffled for two years.

I have dogs so unfortunately I have to leave my speakers with their clothes on or little cute doggie hairs will find their way in them.

I actually just got my BetterCables Bluetruth biwire and I am breaking it in on the center channel. I am withholding judgement for a while but so far it sounds fine. I can detect no real discernable difference yet except perhaps a tad more brightness than my Cobalts. We will see...

I also got a set of Acoustic Zen biwire jumpers and put them on my LSI15s. I actually noticed a diference right away. I was really caught off guard as I did not expect to at all. The sound was slightly clearer and more detailed. I say slight but it is noticeable and slight is big in this game. I am very happily surprised by these little guys.

i was just reading a 'review' on polks and they said putting a jumper in place of the straps made a big difference.my used b&w 601s came with 'nautilus 805' jumpers.i've never been able to compare,maybe truth to removing straps.(now i passive bi-amp)4 now

It really did make a big difference, I still can't believe it. Can you remember where you saw that review? I would be interested in reading it?