## ISO 226:2003 based loudness correction

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Reply #9 –

A 30dB loudness correction seems to imply EQing of over 16dB for some frequencies. Can that be correct?

Not sure. After some tuning by ear, I found that about 10 dB of low-frequency EQing sounds best for 30-40 dB loudness correction.

[**Edit**: Just noticed that I misread the plots (log-linear thing). At 100 Hz, both of our filters boost by about 7-10 dB for 30 dB loudness correction. So the results seem quite close to each other.]

I just managed to design a simple 5th-order parametric IIR correction filter. See the corresponding upload thread. This should work fine as a static loudness correction filter, i.e. one coupled to the volume knob, as pdq described above.

PM me if you're interested in further details.

Chris

P.S.: Yes, Matlab is great