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Another problem I would like to submit to Maestro Ferrarelli and anyone else who is able to suggest a solution to me:
my Weber grand piano has low sound efficiency in the middle and upper-middle keys, so I have to "strive" during performances to give more energy to the right hand and reduce it in the left. Raising the lid almost solves the problem, but the sound does not result in being as full and deep as that obtained with the lid closed.
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The first thing to check is the hammer rail.
If it is new, check if it has been poorly voiced (too... perhaps by intervening near the striking point and at depth!! Let's hope not)
If it has been shaved. Check the shape of the hammers. Rounder in the bass and more pointed on the treble.
Observe if it is very worn and if, in the area in question, the striking point is heavily grooved or "softened"
It may be time to shave the hammer rail or simply voice it (perhaps softening the bass,... if the treble sounds good on its own)
If, instead, everything is in order, one can attempt, with caution, to impregnate the area in question.
If an equilibrium between bass and treble cannot be developed, it may depend on the excessive load of the soundboard.
The soundboard can be relieved by modifying the string load on the bridges. Various procedures exist. But this solution should be kept as a last resort.
Also recalculating and replacing part of the treble strings.
At most, replacement with a new hammer rail, custom-made with more compressed treble, could solve the problem.
A good technician can make one of these decisions and proceed.
I hope I have been helpful. Send me an MP3 and some photos of the hammers, perhaps the problem can be better circumscribed.
Let me know
Regards
Paolo
