Lowest Note on Basses

[Saulo_Henrique]

There is not much risk of the timbre changing when you add weight to your bass reeds versus putting in new reeds of the same size and note as you want. Essentially the low octave reeds in an accordion are always all the same and differ in note by how much weight is added to them. Whether you add more weight yourself or you get new reeds that have more weight added already makes no difference.
However, an accordion that comes straight from the factory with a lower lowest note may have the whole lowest octave made out of longer reeds (on longer reed plates) and they will have a different sound.

Thanks!
However, don't Italian reeds use brass instead of tin on the weights?
Won't the timbre be different?

 

[debra]

Thanks!
However, don't Italian reeds use brass instead of tin on the weights?
Won't the timbre be different?

The Italians use different materials, depending on manufacturer and also the amount of weight needed.
Any possible effect on the timbre comes from how the edges are shaped. They added weights are typically a bit narrower than the reed and trapezoid so that they don't completely block the airflow once the "main" reed tip is through the hole.