Originally Posted by
stejdor
I've just upgraded from sierra 1 to 2ex. I've used them with a Perreaux 80i. Power Node 2i and now have a Primaluna Dialogue Premium HP tube integrated. The Primaluna is by far the best sounding with both Sierras imo. It truly sings. I run it in SET mode (45w) but there's an Ultralinear mode too with higher output. SET is more the enough for me and sounds the best to these ears. I wouldn't class the Primaluna as warm at all it's got a very detailed clear top end to these ears.