Download (or version 5.1.5640 for later 2012 A1278 models) directly from Apple's official support site. Extract the downloaded ZIP file.
Search for and download the specific Cirrus Logic CS4206B driver for Windows. A reputable source for these legacy drivers is the Reddit Boot Camp community or via a tool like Brigadier to download official Apple Boot Camp support software. apple macbook pro a1278 audio driver windows 10 high quality
How to Get High-Quality Audio on a MacBook Pro A1278 Running Windows 10 Download (or version 5
The A1278 MacBook Pro uses proprietary Apple hardware components (Cirrus Logic CS4206 or similar) that require specialized Boot Camp drivers, not generic Microsoft drivers. A reputable source for these legacy drivers is
: Once the Cirrus Logic drivers are installed, sound is crisp and supports high-fidelity output. Some newer driver variants even support 192 KHz microphone sampling for improved recording. Recommended Sources for High-Quality Drivers
Sound only works through headphones, or not at all.
AppleUSBAudioDriver (version 1.0.29.0) or Realtek High Definition Audio Driver (version 6.0.1.7323)