Test condition: from 2020-09-09 to 2020-09-22

  1. DIY silicone tube coupler for inner ear headphones
  2. SONY ECM-SP10 (Microphone)
  3. Meizu HiFi DAC Headphone Amplifier Pro (DAC+Amp: CS43131+OPA1622)
  4. Meizu HiFi DAC Headphone Amplifier (as ADC: CS42L73)
  5. 256k log sweep from 20 Hz to 20,000 Hz by Room EQ Wizard
  6. Noise level in my room