psycho-acousti-what?

Mark Cramer cramer@BrandonU.CA
Tue Feb 13 13:55 MST 2001


A year ago, a client told me she had several notes on her (Baldwin) console
that physically hurt her ear when she played them.

I tried the notes, which were the first few above the tenor/treble break,
and noted they were a bit harsh, but thought (to myself) maybe she was
exagerating a bit.

I tried them as major thirds, which she had been playing, and nothing. Then
I turned my head a bit in her direction, played them again, and "Ouch!" It
was as though someone was pressing their finger between my upper jaw-bone
and ear!
Definitely painful!

I remember trying every bit of "voicing voodoo" I know, to no avail. Indeed,
I had forgotten about this til yesterday. A music teacher with a Baldwin (no
I'm not picking on brands) 52" vertical, who never seemed pleased with the
treble, said the magic words; "it hurts!"

It's exactly the same phenomenon! At first listen, these hammers "sound"
soft at the crown, but hard, very hard in the shoulders. The sound is a big
muffled boom, but with little sustain.

I went at C5 on the big upright with a single needle to probe the shoulder,
certain I would fined hardener,.. but nothing. The shoulder felt is soft,
much easeir to needle than a Renner, Yamaha, etc., even at the crown. I
needled all over the place, and could not change the sensation of the tone
one little bit!

What is the problem?

If you have experienced this, you will know exactly what I'm talking about,
and I would sure love to hear from you. Yes, especially if you've been able
to solve it.

On my next visit, I'm taking a variety of hammers to test, but I'm not so
sure hammers are the problem!?

thanks, as always

Mark Cramer,
Brandon University



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