The original concept of a tone chamber (cassotto) was to allow accordion builder to place larger 16' bassoon reeds in the treble section. Larger reeds without heavy weights move more freely and in general have a richer tone with less twang. Manufacturers achieved this by adding an extra section that was perpendicular to the normal reed placement. An added benefit was that the additional chamber created more resonance and the idea was expanded to a second set of reeds which is most commonly the 8' clarinet reeds. The downside is that a chamber adds some weight and makes the accordion more expensive to build and maintain because all key arms fork off into two pads that must be aligned with a great deal of precision. Most professionals play tone chambered accordions because they want the most powerful low reeds possible to obtain the greatest dynamic range. Tone chambers are often paired with handmade reeds to maximize the richness of tone.
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What's a tone chamber?
The original concept of a tone chamber (cassotto) was to allow accordion builder to place larger 16' bassoon reeds in the treble section. Larger reeds without heavy weights move more freely and in general have a richer tone with less twang. Manufacturers achieved this by adding an extra section that was perpendicular to the normal reed placement. An added benefit was that the additional chamber created more resonance and the idea was expanded to a second set of reeds which is most commonly the 8' clarinet reeds. The downside is that a chamber adds some weight and makes the accordion more expensive to build and maintain because all key arms fork off into two pads that must be aligned with a great deal of precision.
Most professionals play tone chambered accordions because they want the most powerful low reeds possible to obtain the greatest dynamic range. Tone chambers are often paired with handmade reeds to maximize the richness of tone.