A cracked soundboard is one of the most devastating issues a piano can face. In Toronto, the primary cause is the severe drop in indoor humidity during winter when central heating is turned on. As the spruce soundboard dries out, it shrinks. The glue joints give way, resulting in long, visible cracks. To prevent this, always maintain your piano room's relative humidity between 40% and 50% using a high-quality room humidifier.
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