Fixed - The issue was with the tweeter itself. I brought the speaker to the local Yamaha warranty service, where they agreed something was not right with the tweeter and changed it within a few hours. Now, it sounds great.
Hey there, a month ago, I bought a pair of brand new HS7 speakers and have been loving them so far. However, recently, I noticed that when playing higher piano notes, the tweeter on one of the speakers distorts. This distortion occurs only when the volume is above 30%. The other speaker sounds...