Optimal REW settings for measuring amplifiers

[reallystate]

Hello everyone,

I'm starting to use REW to measure the performance of my headphone amplifiers and I have several questions about the optimal configuration. I've done some reading, but I would appreciate some expert advice to ensure my measurements are accurate. My main questions are:

• Should I measure at the maximum possible sample rate, or should I limit it to 48 kHz?
• Should I use low-pass and high-pass filters? If so, at what frequency should I set them?
• What FFT value and window type should I choose? Should these values be changed for different types of tests (THD vs level, IMD vs level, etc.)?
• What sweep length value should I choose when measuring the frequency response of a device, since this choice affects the phase measurement result?
• What buffer size should I set in the sound card settings section?
• Should I use the Overlap option?
  
  Thank you in advance for your guidance.