Can you please help me identify these Polk Speaker ? , Picture attached

vipersvcd

The front speakers have a distinctive curve at the bottom surranding the bass exhaust,
The center looks like a C1 can it be something else?

Also if you do identify them are they good ?
Will a Pioneer VSX-521 be able to push them properly ?

Main use is HomeTheater Movies.

I have also an option to buy used Monitor 40 book shelf speaker ,
Will they be better for my setup ?

Thanks,

kcoc321

My vote is that the theatre speakers are R50
http://www.polkaudio.com/homeaudio/products/recent/r50/

the others look like Mon 7, based on size guestimate, but would need way more info to make a identification.

Welcome to the Club Polk

vipersvcd

Are these the only model that has that curve on the cloth in the bottom ?
The curve looks like the R50 but the way the cloth looks at the R50 seems different than in my photos
In my photos its flat and in the R50 photos they are more pointed / trapezoid

mystik610

Definitely R50's for the mains. Center looks like a CSi3.