Standing waves, RT60 and the −6 dB law — your room's sound problems predicted (and fixed) with free calculators.
Your room's bass problem, predicted: axial mode frequencies for all three dimensions, the pile-ups, and the ratios that spread them out.
Room volume + surface absorption → reverberation time, with material presets and the targets for studios, home theaters, classrooms and halls.
Two machines at 90 dB each ≠ 180 dB: add up to five incoherent sound sources the logarithmic way, with the +3/+10 rules explained.
Sound level at any distance from a source — the −6 dB-per-doubling law, hearing-safety bands, and why outdoor PA needs so much power.
Frequency to wavelength at the real speed of sound in your air — why bass is furniture-sized, treble is fingertip-sized, and rooms care.
Box volume + tuning frequency + port size → the port length that hits the note, with port-velocity chuffing checks and flare advice.
Crossover frequency + driver impedances → the capacitor and inductor values for 1st and 2nd-order passive networks, with slope trade-offs explained.
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