Re: Sierra 1 or 2 for Home Theater
You should really go with the Lunas if you can. They are going to be an incredible speaker. You don't need a lot of power to fill an entire apartment with them. Just pair them with your sub using your receiver and you'll be amazed at how it sounds. The Sierra 2's will also sound great, but like others have said, the Luna is going to be more versatile with regards to placement.
The RAAL tweeter has an incredibly wide horizontal dispersion, so you don't need to worry about off-axis seating. It's also very clear and distortion free, so that ear fatigue you have now will be gone. Zu's speakers are pretty well known for being really harsh because of those oversized super tweeters they use with no crossovers. They claim that this makes them more accurate with regards to tone, but I'm personally not a believer. I've seen a lot of people return them for that reason. Some people love how they sound, much like Klipsch fans, but I think many can tire of them quickly.
-Alex
PS4/Nvidia Shield --> Emotiva XMC-1 --> Emotiva XPA-5 --> Ascend Acoustics Sierra Towers and Horizon Center w/ RAAL tweeters (L/C/R), HTM-200 SE (Surrounds), 2x Rythmik F12 subwoofers