I had lots of speakers: mackie hr800 adam s3 genelec 1031, in that time a pair of K & H O300. I can tell you that cms 50 are great for the price: it is perfectly balanced with a medium sharp incredible for a speaker at this price.
Only thing is lows withdrawal but not absolutely embarrassing On the other hand, the 65 cms is unbalanced in the medium / medium low (I do not recommend them and my friends agree with me ...)

It's not for nothing that the 50 cm had the MIPA 2009 ...

Focal Cocorico!