I would say that yes the sierra one is smooth, detailed, airy and accurate. For some reason when i am listening to a rock songs from like acdc or metallica the high end starts to blend more together as the volume is turned up. However with the raal tweeter that is not the case. A while back i had called Dave and asked him if the nrt upgrade would be better for me being as i feel the sierra 1 tweeter sounded compressed at high volume and he suggested that the nrt would not be better suited for rock as the sierra 1 would be. I did hear some rock on the sierra 2s. They play amazing, that raal is something truly special. I am also very impressed with the bass on the sierra 2s, they can dig for bookshelves. Props to Dave and the ascend staff on a truly remarkable speaker which took just under 2 years to make. Either way you look at it if you have the sierra 1s or the sierra 2s you have something very special, something most people just dont understand.