I have several WAV files that I pass through FFMPEG's loudness normalization:
ffmpeg -i input.wav -filter:a loudnorm=I=-24:TP=-9:LRA=7 output.wav
The output files are on average four times larger (4.8 MB versus 1.2 MB, 1.8 MB versus 453 KB, etc.) Since WAV is already uncompressed, I'm surprised at this larger size.
Why are the output files many times larger?