I asked Microsoft Copilot again and this is what it said:
Hybrid SACDs contain two layers:
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CD layer: Read using a red laser at 780 nm (same as standard CD players).
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SACD layer: Read using an infrared laser at 650 nm (similar to DVD technology).
🔬 Laser Configurations
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Dual-laser systems: Some high-end SACD players (like Sony’s SCD-1 or SCD-777ES) have physically separate laser assemblies for CD and SACD layers. This allows for optimized reading of each format.
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Single-laser with dual wavelength: Many modern or budget SACD players use a single optical pickup that can switch between wavelengths to read both layers. This is more cost-effective but can be less precise or more prone to wear over time.
⚠️ Common Issues
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SACD layer failures are often due to laser degradation or misalignment. Players may still read CDs fine but struggle with SACDs, especially hybrid discs.
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Some users have had success recalibrating the laser or adjusting internal pots, but this is risky and not recommended unless you’re experienced with electronics3.
If you’re evaluating a player or troubleshooting one, knowing whether it uses separate lasers can help diagnose issues or justify a repair. Want help identifying the laser setup in a specific model?
Tom again: Finding laser assemblies for older (and sometimes newer) vintage CD and SACD players is a major flaw with these players. It shouldn't be too hard to find someone who works on Sonys and find out if your SACD laser can be replaced or recalibrated.

