## From the mouth of Billy Corgan...

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Reply #57 –

Looking at the equal loudness filter in replay gain, lots of noise around 3-4kHz will give the greatest calculated perceived loudness. Maybe just a 3.5kHz square wave will do the job - I've just crashed CEP trying, so maybe it really is the limit

I tried a lot of different combinations on that range and the highest attenuation was: -24.06 dB on a square sweep from 3000Hz to 4000Hz.

When I compressed it with different encoders I got these results:

MP3 --APE:

RG: -23.87 dB

Peak: 49569

MPC with --xlevel --quality 5:

RG: -24.09 dB

Peak: 53320.08

Ogg Vorbis --Quality 10:

RG: -16.80 dB

Peak: 35575

So I dare to say the biggest perceived gain based on RG calculations would be ~113.09 dB.

On the other hand the absolute minimum for RG calculations on a 16bit wave would be a wave with -1,+1 bit peaks, (-90.3 dB) in that case the calculation is +64.82 dB, which means the wave percieved loudness is 24.18 dB

So, to sum up, RG goes from -24.09 to + 64.82 dB.