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AirPlay 2 DAC + amp suggestions
Based on your setup, here's a concise take:
Keep your Technics amp and Puris speakers—they're solid. The weak link is the unreliable AirPlay signal.
The WiiM Pro Plus is your best upgrade. It'll give you stable, high-quality audio via AirPlay 2 to your existing system, fixing the core problem. The WiiM Amp or HomePods would be a downgrade.
On a related note, since you use a projector, the screen is as crucial for visuals as the DAC is for audio. When you're ready for the next upgrade, a proper projection surface (like an ALR screen from VIVIDSTORM or similar brands) can transform picture clarity and contrast, much like how the WiiM will transform your sound.
Focus on the WiiM Pro Plus first. Good luck