I just purchased a pair of these from the stereo trading outlet. I currently have the 20's. What kind of improvement can I expect? I'm moving the 20's to the rear.
I listened to both side by side.
I would characterize the 40 as having a fuller sound and better bass extension over the 20. Pretty much what you would expect with the added driver and a bigger box.
Great speakers...
Sean, I can't speak specifically to the differences between the 20s and 40s, but I will say how tickled I've been with my 40s, which I bought in April. Pair them with a decent sub, and you would need to spend $2500+ to find a noticably better pair of speakers. I think they're the steal of the Reference line.
Enjoy.