[1] MOONDROP VDSF Target Response is a target frequency response curve based on the HRTF (Head Related Transfer Function) of B&K HATS under diffusion and theideal room preference curve. The closer the frequency response curve measuredunder B&K HATS is to the target frequency response curve, the more theearphones can reproduce soundstage imaging in terms of frequency response.

[2] The frequency measurement is tested by "Free Field Laboratory" of MOONDROP R&D Center, for reference only. The test data might be a bit biased from yours due to the test environment, background noise, indertion depth and use of eartips, as well as the test devices.
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