Build quality: Built like a TANK!!! That is the first thing one notices about this powerful pair, I got mine from the US. I have been using these for 3 years now, and they are as good as new. Make no mistake, this is a long-term purchase. These will outlive you (unless you immerse them in beer regularly)10/10Sound: Now, the most important part: the Sound!!Frequency resolution: A lot of hype has been created around perfectly flat responses. Frankly, that B.S. What matters a lot more is frequency resolution - how fine can you hear? These things are absolutely crazy - I have been able to hear things I can't on my KRK 6s.Frequency Response: Flatter than cheap monitors. However, not as sterile as, say, Genelecs or Questeds which cost 3 to 4 times the price at times. There is definitely some extra bass. However, you can adjust the curve a little with the filter knobs at the back. This is not a deal breaker though. It just stands out because the rest of the package is so tight. Also, a little extra low end oomph, isn't really a bad thing.Trebles and super highs: Clearly audible and detailedMids: Exceptionally detailed.Bass: Shaves off at 70Hz or so - these are 5'' drivers, you really cannot expect them to go lower. Yamaha has boosted the bass a bit to add a bit of balance. This is adjustable from the +/- 1.5db filter knobs at the back. I would recommend a sub though for professional mixes (given your mixing room is large enough). People have used it with Yamaha SW10, HS 10 - and it produces great results with all of them.Stereo imaging: Again - perfect. However, I will put in a caveat: this is much more a function of your room than the speakers. My room is acoustically treated.Overall Sound: 9/10 (only because I have heard better on monitors that cost 1.5lakh+ /per. At this price range, you cannot ask for more)Service and after sales: Never had a problem. I have had Yamaha keyboards though. Yamaha's service is great in Indian ...