[pianotech] soundboard grain angle vs "faux"stiffness

Ron Nossaman rnossaman at cox.net
Thu Jul 15 11:18:19 MDT 2010


jimialeggio wrote:

> Absolutely....I personally will not tolerate the clang... but it is one 
> of the most difficult parts of the tonal envelope to deal with without 
> losing that "pop" that crisply starts the tone.

There doesn't seem to be a clear dividing line between pop and 
clang, which seems to me to be a considerable part of the 
problem. I'd love to hear that Chickering first hand. My 
experience is that these boards are way more efficient than a 
CC board, and produce a different tonal envelope with a given 
hammer. I find a hammer that is borderline adequate to needing 
hardener for a CC board, is too hard for RC&S. At some point, 
voicing preferences come in. Here's what I think I'm hearing 
on my boards. Something like Ray's Wurzen hammers produce an 
attack that is sharp and loud, which doesn't blend well with 
the "dwell" and decay. I find that if I can get that attack 
down a bit (the usual shoulder work, followed by side needling 
does something I really like) and extend it into the dwell, 
the overall tonal envelope blends better and sounds much 
better ("swell" <G>) to me. What you describe as high partial 
chaos on the attack (I'd call it clang) goes away, and the 
decay slope is less steep. All the power is still there, it's 
just spread out farther into the envelope instead of being 
concentrated into the impact. The down side is that the 
pianist isn't getting smacked in the forehead with the 
disproportionately huge attack spike, and perceives the piano 
as lacking power. Out in the hall, however, I find this board 
and voicing combination to carry at least as well as the 
percussive attack on the CC board, and to my ear, has a richer 
sound, stronger in low partials.


  > The sound was such that I could physically feel it in my 
gut, kind of
> like when I was a kid watching the 4th of july parade and the bass drums 
> would go by...went right to the solar plexus it did. Powerful but in a 
> comfortable and inviting way.   

Surf... Thunder... Car stereos that pulverize bone... We seem 
to have a built in affinity to low frequencies.


> One of the things that I've noticed about the local rc&s attempts is, 
> that in general, what I've heard has a too complex and prominent 
> collection of upper partials.  Graphs of the contents of the sound 
> envelope show fundamental, a strong showing, but a very heavy and 
> complex collection of upper partials which, to the ear/mind makes it 
> "seem" as if there is poor fundamental.
> 
> My own bellies up to this point show similar tendencies.   

My rib scales have gotten considerably stiffer over the years, 
and this has helped. That, and voicing a slightly too hard 
hammer to accommodate.


> This is why I'm particularly interested in other factors that are 
> effecting  the initial attack other than assuming that the  rib scale is 
> the only issue that is relevant.  I am on board that it gives repeatable 
> control over targeted spring, and will continue to commit my efforts to 
> the refinement of that spring profile, but I'm also thinking hard about 
> how the panel/bridge restricts that targeted rib spring in ways that I 
> dont have a good handle on.

Panel compression has to be a factor. I think this has a lot 
to do with assembly efficiency, and a low panel compression 
assembly has a deeper vibrational excursion than a high panel 
compression assembly that won't go below it's "at rest" 
position. I don't see any way this isn't a factor. I suspect 
that if you raised the panel compression level in one of your 
boards (assembled at, say, 5%MC), the hammer hardness 
tolerance would go way up. It wouldn't be an RC&S board then, 
but should sound and react more like everything else out there.


> Still learning

Everyone who's interested is. Slowly, but I think we're 
gaining ground.

Ron N


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