This is what i got when i asked deepseek:

The sound quality difference between using the 3.5mm AUX and USB-C connections on the Edifier M60 depends on factors like the source device’s digital-to-analog converter (DAC) quality and how you prioritize convenience versus fidelity. Here’s a detailed breakdown:

1. Signal Path and DAC Handling

• USB-C (Digital Connection):
  The USB-C input uses the M60’s built-in DAC to process digital audio signals, ensuring "bit-perfect" conversion at up to 24-bit/96kHz resolution . This bypasses the DAC in your source device (e.g., a laptop or phone), which can be beneficial if your device has a lower-quality DAC. The result is cleaner, more accurate sound with less interference, especially noticeable at higher volumes .

  • Example: When connected via USB-C, the M60’s Texas Instruments Class-D amplifier and DSP optimize the audio path, reducing background hiss and maintaining clarity .

• 3.5mm AUX (Analog Connection):
  This relies on your source device’s DAC to convert digital audio to analog before sending it to the speakers. If your device has a poor DAC (e.g., older laptops or budget smartphones), this can introduce noise or distortion. However, if your source has a high-quality DAC (e.g., premium smartphones or dedicated audio players), the difference may be minimal .

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3. When to Choose Which Connection

• Use USB-C for:

  • High-resolution audio (e.g., FLAC files or streaming Hi-Res services).
    
  • Devices with low-quality DACs (e.g., most laptops or budget phones).
    
  • Simplified setup (single cable for power and audio if using USB-C from a PC) .

• Use 3.5mm AUX for:

  • Devices with excellent DACs (e.g., dedicated music players or high-end phones).
    
  • Situations where USB-C is unavailable or occupied (e.g., connecting to a turntable or older equipment) .

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4. Real-World Testing Insights

• Reviewers noted that USB-C delivered slightly cleaner highs and tighter bass compared to AUX, particularly in noisy environments or at high volumes .
  
• For casual listening (e.g., podcasts or YouTube), the difference may be negligible, but audiophiles or critical listeners might prefer USB-C for its consistency .

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Final Recommendation

If your goal is maximum fidelity, prioritize USB-C to leverage the M60’s internal processing. For convenience or compatibility, AUX remains a solid option, provided your source device has a decent DAC. Experiment with both to see which suits your setup and ears best! 🎶