Somewhat new around here. I’ve been hanging around the forums and reading reviews and have a few of questions.
I’m looking for a substantial upgrade for my speakers (Music only). I currently own Polk LSi’s towers (3- 7.5” woofers; 2- 5.25” mid range and 1- 1” tweeter) driven by NAD C375BEE. Looking at moving them to my HT room and finding very good tower speakers for music listening. The Polks sound good but they are really more geared for movies and I want to hear what the next “level” is. Currently looking at Martin Logan Motion 60XT’s and Def Tech BP-9060ST. Of the two, the Martin Logans sounded better to me. The Def Tech’s were way too bright…
Since I can not listen to the Sierra Towers, I have the following questions:

Are the Sierra Towers better than the ML’s?
Is the ribbon tweeter worth it for music? ( I listen to all kinds of music, rock, classical, new age, chill jazz)
Are the Sierras better than the Polks I own?
I have a hard time believing that (2) 5.25” woofers on the Sierra towers can sound better than (3) 7.5” woofers of my Polks. (the same for the midrange) Can someone comment?

Thanks