FrankHarveyHiFi said:
The 20's have a better bass driver and HF unit over the 40's, and the 19's have a better bass driver than the 40's, so I'm correct in what I have stated.
I don't think this is right. The SL driver on the 19s and 20s is not a dedicated bass driver, so is different from the SL drivers used in the 50s and upwards - these are superior to the 40s bass driver for sure but I would say the 40's bass driver is superior to the 19s. Even if you want to debate that, the 40s have the studio soft dome mid driver, which ATC describe as being 'the only mid-range device capable of giving ultimate performance': http://atcloudspeakers.co.uk/downloads/entry_series.pdf
FWIW (and accepting you have heard many more speakers than me), having heard the SCM40s as well as floorstanders twice and four times the price, I agree with the sentiment that SCM40s are the finest VFM around