Re: Downsample before encoding or just use lowpass? Reply #25 – 2020-10-23 16:16:27 Quote from: rutra80 on 2020-10-22 20:10:58... might be worthwhile if we don't care about anything above 12kHz... I was thinking of the number of cases where that is done accidentally, such as whenever the speaker isn't pointed directly at you (aka off-beam), and listening to an ordinary radio (tends to filter lower than the 15khz spec). The typical place for both of these, is in the car. So, that seems like a good place to test drive some downsampled MP3's. With 24k sample rate, there's a cool trick of changing the average signal treble density (slightly) back up to what you'd expect; but, with 32k sample rate there's no extra steps, except for how nice the resampler can do. If goodly smaller files was the goal, then downsampling is effective. For smaller MP3 files, the resampling cost is more than paid-off. However, if large files is the goal, then resampling cost might not be appropriate.