I bought these castor cups to isolate a grand piano from the floor in my very poorly soundproofed Nashville apartment. The build quality of the cups is very good, as it should be at this price point. I have rated them 4 stars as I believe the isolation from the floor could be a little better in the bass end - I have almost total isolation from mid to high range and roughly 50 to 70 percent reduction in transmission of low mid to extreme lows.
Delivery to the USA was fast - only about one week with good tracking updates.
In terms of the packaging, the box was badly damaged and given the size of the holes in it I am very lucky that all three castor cups arrived - however, they did and in perfect condition.
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Soundproofing for the wing
The Piattino supports help decouple the rollers of the wing legs (ie the parts connected to the ground) from the ground.
This means that the structure-borne sound transmission into the ground can be very strongly damped. It is comparable with the difference, whether one is with hard soles directly over a wooden floor or a carpet is laid, mind you: Only the body sounding beteppend.
There is the opinion that this decoupling makes the instrument sound different, in my opinion, the sound of the piano does not change significantly or not. The wing sounds anyway through its own components, the space determines the sound thereby, but not over the body sound.
The sound of the room will, of course, continue to exist, and will be able to sound, which means that the neighbors can hear it through the walls, the floor and the ceiling.
There are several such coasters in different versions, the Piattino coasters in two different sizes. They are very cleanly manufactured and also suitable for the permanent weight of a wing, ie per leg beginning with approx. 115 kg.
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