Redhouse, maybe I'm a bit confused...are you saying that you just compared the CC570 and the C3, and you HAVE the ADP470 and the Sig ADPs? If in fact you have the latter, why do you have both? I just purchased the Sig ADP and I think it sounds excellent, especially with the 8" bass driver.
I did just compare the CC570 to the C3 and demoed both ADP's and ended up with 3 CC570's as my LCR and two ADP470's per Paradigms advice on my room and setup. I wanted the C5 but it wouldn't fit.
And this "big" (and quite strange) set-up made you conclude that the Sigs were not worth it over the Refs?
What about trying the S8 and the C5 against the 100 and 570 before making a wide conclusion like that?
I demoed all the speakers in the Studio Series and the Sig's lines before I decided and settled on what I have. Following the advice of my Dealer and Paradigm, my quite strange setup works very well.
Look at the 570 and the C3, the size, drivers, Frequency Response are so close, were do you justify the extra cost?
You can't compare the S8 and C5 to the 100 and 570 the Sig's are a lot bigger and handle more power. But, the Frequency Response between the 100 and S8 is very close and the 100's play as low as the C8, 28 Hz
IMHO, I don't see enough difference to justify the much higher cost between the two lines. I thought the 100 sounded just as good as the C8's.
This is just my opinion, so two each his own.