Curious as to the difference between Paradigm Studio & Signature series

I'm about to pull the trigger on a pair Studio 100s (wanted the 60s, but soon I will no longer be able to hook up my sub so I better go with the 100s).
Anyway, seeing and hearing both the studios and Signatures in person, I am curious as to what is the difference between say the Paradigm Studio 100s vs the Signature S6 aside from the number of drivers and the fact that the Signatures are double the price. I've read that the drivers are supposedly different, but in looking at the specs and hearing I don't see any difference in performance or anything else along those lines for that matter. The dealer told me it's the drivers and the bracing, but I never listen to anything a dealer says.

Is it the bracing? If so, why wouldn't they do the same bracing in the whole upper line of their speakers?
Is one (the Studios) MDF and the other (Signature) real wood?
What I guess I am asking is what justifies the huge price difference in what seems to be nearly identical speakers?

Thanks. All interesting points. To my ears anyway, I found the 100s to be very detailed and even equal to a pair of B&W Nautilus in sound.
From what I can recall the Sigs were detailed as well, in fact I could barely tell the difference except in the highs, but it wasn't much difference and I had to strain to hear it. I listened to the 100s for a solid hour and did not find them fatiging at all, same with the sigs except that I listened to them for only a half hour knowing I couldn't afford them in any way, but I'm sure they would not have proven any less or any more fatiging. I was just curious.
When factoring in the diminishing returns I figured any attempt to get into a $6000 pair of speakers just because of some exotic substance (not that there is anything wrong with any of it), would prove to be null or pointless to me.

Absolutely and with the same media selections (my own).

I have it hooked up now of course as I am in a single family residence. However I will be moving in a few months to most likely a Townhouse/Condo situation and in most cases subs are not allowed due to common walls and all.
I don't play loud, but subs are subs and as you know with them you feel more than hear.

Really? I love real low late at night volume with the bass, yes very cool. Hmm, I should try that with my current set up and see how it works. If it works well, I may be able to get away with getting the Studio 60s instead for about $1000 less than the 100s. Something to consider.

Hadn't thought of that, good point.

The only two stores in my area that carry Paradigms do not allow "borrowing". I had to evaluate based on educated calculations with my fingers crossed, but I'm sure I can't go too far wrong with the Studios.

Currently, believe it or not, I'm using 1985 Kenwood JL-690s that cost me $85/pr back then! I have an HSU VTF-1 sub. I was thinking of just trying your suggestion with what I have right now.

LOL! OMG I'm old!
Anyway, yeah, when my Polk Studio Monitor 7s hooked up to my 35 wpc Marantz 2238b sounded better then my Kenwoods hooked up to my 100 wpc Onkyo TR-S705 I knew I had been missing something for years. So one day I went out and found a "high-end" shop with some B&W 8s and heard them and was shocked at what I was missing, that started my 3 month adventure in researching and demoing speakers finally settling on the Paradigm Studio 60s at first, but then with the coming changes switched to the 100s (while holding my breath and gripping my wallet). I have to admit the 100s have a slight, but noticable edge over the 60s, however both are fabulous speakers and equally detailed.
(I'm not crazy about the looks especially in the black ash as it makes them look like cheap Best Buy specials, but performance is more important. They look best in Cherry, but that's $400 more! My entertainment center is black as are my CD cabinets and the sofa is dark brown so while black ash would match all that I am leaning more towards the rosenut finish as it is the second best looking option and doesn't cost extra).

Yes, they call it Piano finish for the gloss black. Yes, absolutely certain that the cherry and piano black cost extra. The only non extra choice is black ash or rosenut.

Right now I'm using cheapo $30/pr small two-ways for surrounds I picked up from said BB 12 years ago. I'll think about changing them out last as they are not that important as almost any small speakers will do for delay.
For the center which I will get later I'm looking at the smallest of the Studio series or something from the line below that. I don't have room for a huge center nor do I want to spend $1000 on a center. I'm 20% HT and 80% music so no need to go wild on the center. Currently I am using a Polk CS-1. I don't like it much though and will be swapping it out as soon as I can.

While true that I could hear a difference it was subtle and I needed to strain to detect it.
What you say in the first paragraph is what I have been saying all along while researching for speakers. You should have heard the arguments against it....crazy nonsense.
I think the point is proven with the studio line vs the sig line. They are so close in almost all respects, you have to go out of your way to tell them apart. Money doesn't always buy cost effective quality. Worth paying double the price of the studios for a Be platonium tweeter thingy?..No. (Not saying the Sigs are bad or a waste, certainly not, but for the many of us without monthly disposable income or huge inheritance or what have you, the studios are not a comprimise at all and more cost effective).

Not old enough to have hearing loss yet. I have trained ears as well so I was able to hear the difference, but as I said, it was so subtle and pretty much only in the highs that I did have to concentrate a bit extra.
Nothing wrong with the Sigs even if they are double the price. If you can afford them, get them. The Studios are not "cheaper" except in cost. Performance-wise they are very close to the Sigs.

I've tried a lot of bookshelves including the sigs and the 20s and I didn't care for them. I don't like having to rely on a sub 100% of the time.
Definitely keeping the sub. One doesn't spend a fortune (to me anyway) on a high-end sub to give it away a year later.
Looking into the block filter thing as well as another suggestion of merely tweeking the set up so as to change the activation threshold.