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When running the bass signal through the OD pedal, the signal gets compressed and this adds harmonic overtones and increases the level of highs and mids to the signal.

Q: When people say the distortion will make the low end drop, what do they mean by that? Is it in terms of Amplitude decreasing to the low end signal or decreasing in volume of the low end sound to human ears as mid and high overtones are now louder?

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    The signal ends up containing more highs than lows, so it sounds like the bottom end has been lost. – Tim Mar 19 at 7:11
  • @Tim Can you pls clarify more on that? Do you mean in terms of low end signal level’s lost or human ear perception? Thank you. – user506602 Mar 19 at 7:18
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    I guess it's not so much a loss of bottom end, but a gain of top, which then makes the sound less bottom heavy. This is a comment rather than an answer, but makes sense to me. – Tim Mar 19 at 7:54
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    @Tim sometimes when bass is overdriven, the signal is split to low and high bands and only the high band is run through the overdrive. This keeps the low-end clear, but gives the sound overdriven harmonics and compression. If what you're saying was true and overdrive only caused additional highs, then the parallel two-band processing should result in the same thing and would make no sense. The problem must be either that overdrive removes some low frequencies, or that it adds some unwanted low frequencies that make the sound muddy and that the two-band parallel processing does not add. – piiperi Reinstate Monica Mar 19 at 9:02
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    @piiperiReinstateMonica - thanks for all that. I've never used overdrive or distortion on bass, in all the years! It stands to reason that when harmonics are amplified due to overdrive, the higher end of the spectrum will be more pronounced, as harmonics are higher pitch anyhow, and it also makes sense not to amplify the lower end any more - too muddy. The start of any note played will generally be a quick attack, whatever overdrive is doing, and the end will be whenever the player decides it will be, usually. Notes aren't often longer than a bar (not when I play...). – Tim Mar 19 at 9:19

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