Couple points of gentle critique:<p>It's kinda hard to compare the different spectral representations when they're zoomed and cropped differently.<p>Spectrograms can be misleading, in a few different ways. Magnitude FFTs discard phase, which we can hear. And our eyes tend to fixate on the peaks, but the noise floor between harmonics in speech had a big impact on perceived quality. Choice of color scheme and gradient changes how we look at the spectrogram: they can emphasize mathematical or coding artifacts we wouldn't hear, or hide things which we can hear. At the end of the day, we don't hear with our eyes... So a spectrogram is a tool for looking at audio, but not always an 'honest' one. So I'm a bit suspect of pouring over slightly different spectrograms, and worrying about which ones look better aesthetically.