Sound is literally the least important aspect of miner hardware, especially to a company that would like to sell a large quantity of units. One decent sized farm places single orders most likely equal to an entire years worth of solo purchases from home users. There is no money to be made
What matters is price, efficiency, 30/60/90 day failure rates, and the ability to buy in bulk with reasonable shipping times.
Also, Syan is still saying all the wrong things if they are in fact a legit company. They offer a FIVE YEAR warranty on mining gear? How many color guard troops waving red flags does it take to clue people in?
Can't hurt to try and see if they're legit. If they're new to the mining scene they might just be inexperienced with everything, but lower sound could still be a small plus, even if it's not a huge bump up in sales. I do find it a little strange they aren't willing to distribute any units for review, though. Even one Hotmine gave out a few units of their Bitfury miner for review, and we all know how elusive those things are.