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Headphones
Finding a masterpiece is not the end.
Next, need to find it with good sound quality.
Sound quality can only be assessed by ear.
To prevent extraneous sounds from interfering with this,
I came up with the idea of wearing noise-canceling headphones
over in-ear headphones.
This makes it possible to identify sound defects much more effectively.
The protruding parts of the in-ear headphones had to be cut off
so that they would fit into the earcups of the noise-canceling headphones.