The surface area of a 1ft3 cabinet is about 20X the surface area of an 8" woofer. Consequently the cabinet only has to move 5% as much as the woofer before it contributes as much 'noise' to the signal as the speaker itself, all of it a distortion of the original, and .5% as much motion of the box relative to the woofer generates unwanted sound, a very audible 10dB below the reference output of the woofer. So, either you live with it, or mitigate it with some combination of bracing, mass, constrained layer damping (KEF), cabinet geometry (Estolon) or materials (Wilson). or use it as a tuning device (Harbeth). Properly done, all can be effective in achieving the designers goals. All are preferable to ignoring the issue. A couple simple braces. A simple diagonal panel to break up both acoustical and panel resonant modes can be a very cost effective solution, adding a viscoelastic layer adds mass and dampens panel resonances, at some cost penalty. From there the sky is the limit, aerospace grade machined aluminum, molded mineral filled resin, concrete, you name it, its been tried. There's no magic bullet, one Holy grail of speaker cabinet building, just solid engineering, testing, and listening.
