Cantilever bridges and speaking lengths

Calin Tantareanu dnu@fx.ro
Sun, 23 Nov 2003 22:12:08 +0200


Hello!

While looking at some pretty big old pianos (parallel strung) which had
cantilever bass bridges, although they had quite long speaking lengths, I
was wondering how do these features influence the piano's sound? Now I did
read the messages here lately, saying that many of you choose to remove
cantilevers and shorten the speaking lengths.
But provided that:
1. The cantilever isn't excessively long (let's say no more than 10 cm) so
it's stiff enough and doesn't flex;
2. The backscale is sufficient (what is the smallest length recommendable
for the backscale of A0?);
Then, why wouldn't the cantilever make sense for moving the bridge footprint
to a more flexible area of the board and thereby have longer speaking
lengths?
In other words, is the gain in speaking length worth loosing [whatever you
loose through a cantilever bridge]? Up to what size, if any, is this a good
trade-off?

Now, I know that a floating board could solve this problem, but still, it's
interesting to know if there are any other inherent flaws of cantilever
bridges which I can't see so far.
I have a Steinway O, under repairs right now, which has a cantilever bass
bridge and a pretty short backscale on A0, yet it has a very deep tone in
the bass. The board also seems to be quite flexible down there, if you knock
on the bass bridge (strings are currently off) it produces a low frequency.

So, what factors do influence the tone of the low bass and how?

Regards,

 Calin Tantareanu
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 e-mail: dnu@fx.ro
 http://calintantareanu.tripod.com
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