Notes

Port And Cartpet Underlay Notes

The port acts like an interface between the inside of the box and the outside world. It counteracts the moving of the voice coil which is moving in and out via. magnetism.Carpet Underlay absorbs frequency inside the box. Low frequency inside the boxes will bounce off the sides of the box, colliding with other frequiencies that need to be reproduced. This results in the bass being canceled out and the speakers sounding 'tinny'. Carpet underlay thus allows the bass to be reproduced.

Bracing Bracing Notes
Bracing the speakers will counteract wood flexing. This is an acoustic treatment that allows the box to stop flexing when waveforms [frequency] are reproduced inside it. Polarity uses alternating voltage to reproduce frequency. Opposing forces attract and like forces repel, so this produces a frequency out the speaker between 20 hz - 20khz.