the 20T is not a direct replacement for the 10T...it's a big brother...I understand there may be one or two models on the board as replacements/upgrades for the 10T...but not for a year...there is a big gap between the 8b, LR5's and the 20T...had a chance to listen to the 20T's recently...The sound is outstanding and this was right out of the box for all intents and purposes. The new tweeter is open, clear and detailed with no shrillness or brightness. The low end is fast, tight and deep with no boominess. The mid needed a bit more time to loosen up, but they probably had less than 50 hours on them when I heard them. Dynamic integration is smooth from top to bottom with great air and imaging. I like the Aerial signature sound and the 20Ts carry that to a new level...pricing, unfortunately, is beyond me...