1. Which pads gives the widest soundstage and are they a considerable improvement ? The only thing I would wish for is a soundstage that is more along the lines of the Sennheiser HD650 but there are fully open headphones.
2. And does one need to tune the T50RP differently if Alpha Pads are the end destination?
I do still need to do detailed comparisons and update the website, but I agree with what Tieman says above in that the Alpha pads have a greater sound-stage VS the shure pads and the dog pads. I will try to update the website with more detailed info soon, hopefully tomorrow, just need to find the time to do it!
As far as tuning there is no difference in the modification for any pad, I do tune each headphone slightly after a listen just to make sure it has the sound I want though.