I bought it used pregnant (she had four months) for use in return, I possess a pair RCF ART 325A coupled to the facade has a sub 4pro8001AS Rcf.

first impressions:

the opera live 210 are dull compared to rcf, a great lack of clarity arises (1 cons 2 "titanium on the rcf he had guessed), it is one of two speakers that emits a strange noise, the kind of noise emitted by a 50 Hz transformer sheet metal, after checking the power transformer is located just behind the 1 "compression, it vibrates all the plastic case, I'm going to disassemble is add rubber shock absorbers, the problem be resolved (the other speaker is perfectly silent, it is a small defect in the assembly plant, a pity that technology is not db Mount toroidal transformer ....
after correction of the speaker's equalizer, the diffuse sound quality is very good, she'll blush a lot of quality Stereo speaker ...

I'm happy with my purchase the report quality / price is excellent for 500 pair in nine (bought 350 the pair used) for use as I did, I had a stomach ache to invest in Art 310 A (twice the price)