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refit44_report.md

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44.1 kHz refit

Four VDCs had a 44.1 kHz bank that drifted from the 48 kHz one; the refit brings each back to 0.2 dB or less, offline.

Result

Profile Max error before (dB) After (dB) Max pole radius Written
iem-hd 0.14 0.01 0.9602 no (already within 0.3 dB)
iem-v4 0.92 0.03 0.9689 yes
iem-v10 1.36 0.01 0.9705 yes
spk-v6 0.02 0.00 0.9924 no (already within 0.3 dB)
spk-v8 1.59 0.02 0.9890 yes
spk-v10 1.57 0.20 0.9899 yes

Max error is the 44.1 kHz bank against the 48 kHz bank.

How it was checked

src/dsp/refit44.py compares each 44.1 kHz bank's computed response with the same file's 48 kHz bank on a 600-point grid from 20 Hz to 20 kHz.

What changed

  • Only the 44.1 kHz line of four VDCs changes.
  • The 48 kHz bank, the section counts and the file format are untouched.
  • The refit files were promoted into src/profiles/ in 6.1.0 after a listening check reported by the author.