Up until last Thursday I had my Klipsch RF-82's set to small, the crossover to 60 and my center Klipsch RC-64 set to large thinking it would help make the center sound more powerful.

I changed it to small and I can hear more bass, I mean low bass emanating from the subs. Was there that much going to the center than I realized?? Having all 3 fronts set to small seems to go against rational thinking, the RF-82's are very large and the RC-64 is huge for a center weighing in at nearly 70lbs and housing 4 6.5inch woofers. So a few weeks back I set the mains to small but not the center, I wasn't being logical. But the more I read the more people in the know say all 3 fronts set to small.

So, I am amazed at how it sounds now but need to know if I am just imagining that there is more bass or what?

I would love to hear from people who aren't guessing but really know, thanks. :)

Your sub plain and simply can handle lows WAY more credibly than your mains. Very few mains can do under 30/40hz with any authority, regardless of what the manufacturer's specs say. So you were probably losing some bass that was going to your center which simply couldn't reproduce it.

So yes, in a nutshell you're hearing more "low bass" because the bass that was being directed to your center is now being directed to your much more capable subwoofer.

One thing that might be happening as well is that your center speaker and sub are trying to play the same information at times and the overlap in the bass area may cancel each other out - an issue of the phase between the two.
If I try and run my Klipsch Forte IIs full-range there is significantly less bass output at my main listening position from my subwoofers - even with Double Bass set to On on my receiver.

Your sub plain and simply can handle lows WAY more credibly than your mains. Very few mains can do under 30/40hz with any authority, regardless of what the manufacturer's specs say. So you were probably losing some bass that was going to your center which simply couldn't reproduce it.

So yes, in a nutshell you're hearing more "low bass" because the bass that was being directed to your center is now being directed to your much more capable subwoofer.

Agreed, not sure what logic I was using considering the center was set to large and the AVR was set to 60 hz. Not sure what I was thinking, it should have been all 3 at small when I made the switch, obviously wasn't using the right logic at the time.

One thing that might be happening as well is that your center speaker and sub are trying to play the same information at times and the overlap in the bass area may cancel each other out - an issue of the phase between the two.
If I try and run my Klipsch Forte IIs full-range there is significantly less bass output at my main listening position from my subwoofers - even with Double Bass set to On on my receiver.

Yeah, that makes sense as well, I know at first when I had them all set to large the bass was muddy. Thanks, good points.