Loudspeaker design tools
Well, at least something to experiment with loudspeaker design in mind.
Calculators and visualization
Sound wavelength calculator
Convert sound wavelength to frequency, or frequency to wavelength
Sound wavelength calculatorVertical reflections calculator
Play with simple vertical reflections, floor bounce and ceiling bounce.
Vertical reflections calculatorListen
Try crossover filters on headphones
Try ideal IIR filters as two way crossover on headphones.
Try crossover filters on headphonesTry group delay on headphones
Try audibility of group delay on headphones.
Hear group delay on headphonesTry stereo image sharpness
Try effect of frequency response balance to stereo image
Stereo image sharpness test