On a new upright piano that is freshly tuned, I hear a high pitched chime-like noise specially when I press and release two mid-range notes simultaneously, like B3-flat and D4. The noise is like someone hitting on crystals inside a cave far away, and it rings for short a moment even after I release the keys.
I can imagine this should have something to do with harmonics of other strings being excited. But is there a way to get rid of it? Or is this something that one has to accept as "quality" and has to live with it?
I opened the case and tried to check the source, it seems that it is not the small strings that are without dampers. I also tried to damp the struck string by hands, but the chime persist.
I made recording which you can listed to the sound here. (You have to bring the volume up you clearly hear the ringing.) I created a time resolved frequency spectrum which is shown here:
From the spectrum I can see the principal component of the two mentioned notes (D4 = 293.665 Hz and B-falt 3 = 233.082 Hz). But there are the other harmonics that are present all the time, perhaps due to other strings in spite of having dampers.
Can it be that the dampers of other strings are not pressing hard enough?
Or am I just being too sensitive on this?