DIY Audio means "do it yourself" audio. Rather than buying a piece of audio equipment, such as an amplifier, a person makes it themself.
DIY audio is a hobby for many technically savvy people and engineers. Many think that they can make equipment for less money than it would cost if it were bought new. Many do it for the enjoyment, spending much more time and money on a project than it would have cost to purchase something similar.
DIY audio involves "projects" directed to audio. Many DIY audio people fancy themselves to be an audiophile. These people use rare and expensive parts and components in their projects.
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