@traudio wrote:
... Current speakers are Magnepan 3.7i with a Hegel H390 integrated.
I'd like to try the other side of the audio coin, tubes and higher sensitivity speakers.
Those are very capable main speakers that you currently have. If you want to try the combo of tubes and high efficiency speakers that's somehow a "from the other side of the fence"-equivalent, and one that emulates the sheer physical height of overall large air radiation area of your Magnepan's, I'd go for some large, "old school" and used horn speakers the likes of which could be a pair of older Klipsch Khorns (that also have upgrade kits for the mids and tweeter section by Greg Roberts) or other similar-ish. Disregard new speakers - with $4-5K perhaps at your disposal I'd squeeze out the most of that dough with used horn speakers that maximizes the physical wallop. We're not speaking blow-your-head-off SPL potential here, but one that takes a fuller advantage of horns in providing for a large, relaxed and dynamically realistic sphere of sound. Indeed, go big, and let that physical framework be a reference or foundation of sorts for further refinement.