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I have read that boosting is not that bad, or "less worse", if you do it on a higher frequency. Is this true?
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It's fine in varying amounts on any frequency that will enter the BFD at a maximum voltage that is less than the BFD's maximum input.
This would be those frequencies around and above the crossover.
With an 80Hz crossover, as an example, a 120Hz signal will always enter the BFD ~24dB lower than a 60Hz signal. Problem is, equalization is less effective as you move along along the target curve. Any eq at 120Hz would be ineffective.
Think of using gain in the BFD this way. A 20Hz signal that enters the BFD at its maximum input level will drive the yellow LED on. That's fine. At this point, how much gain can you add to a 20Hz filter to clip that 20hz signal and turn on the red LED? Zero........ gonna have to turn that input level down. Now the softest 20Hz signal just went into the noise...... So, the DSP may have a little less to work with, the difference between the maximum and minimum signal that can pass through the BFD is less, so you have less dynamic range.......................... can you hear the difference? Maybe, maybe not.
brucek