I have owned numerous low efficiency speakers until I heard 15'' Tannoys. The energy they gave me was a revelation. In my opinion, nothing can compare to high efficiency. I've tried many Tannoy and Altec speakers. Although a bit rough at first, I now prefer the Altec. These are the only speakers that made me feel like live music. I've owned Altec VOT (Voice of Theater). They we're among the best speakers I've ever heard, but phasing and fine tuning of the drivers was too complicated for me. That's why I chose the 620A monitors : phasing is perfect. You simply cannot reproduce the dynamic of an orchestra with small and/or inefficient speakers.

“If it measures good and sounds bad, it is bad. If it sounds good and measures bad, you’ve measured the wrong thing.” — Daniel von Recklinghausen, audio engineer at EAD and KLH