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I have identified the book you are referring to: "The Audiophile's Project Sourcebook" by G. Randy Slone.
You can access the full text or purchase a physical copy through these platforms: the audiophile 39s project sourcebook pdf
Filters: Comprehensive guides on passive/active filters, including bi-amping and tri-amping setups. I have identified the book you are referring
For vinyl lovers, Slone doesn't skimp. He offers two designs: a standard RIAA equalization stage and a "zero-feedback" discrete design for moving coil cartridges. The PDF schematics detail the exact RC networks required for proper phono equalization. Concentrated, practical designs tested by hobbyists
Speaker Protection: Essential circuits to ensure a malfunction doesn't destroy your expensive drivers. Practical Tips for the "Project Sourcebook" Reader
The book provides detailed instructions for constructing a wide array of gear:
As an audiophile, you're likely always on the lookout for ways to improve your music listening experience. One way to do this is by taking a DIY approach to building and customizing your own audio equipment. The Audiophile's Project Sourcebook PDF is a comprehensive guide that provides you with the necessary plans, schematics, and expertise to create your own high-quality audio projects.