Answers: they may heat up a bit more, due to smaller amount air to cool, but the bigger concern is the atmosphere presure behind the sub, a smaller hutch will produce more presure if the sub cant take it you could blow out the surrounds, from the inside out..
seperating them from a the cone. the "burn" you refer to is a thermal disappointment usually caused by overpowering or overdirving amp. what you would experience near to small a cabenit is a mechanical ruin, essentially the sub tears itself apart.
depending on how "to small" is you may be o.k. but i would certainly not be in motion more than say 10% too big or to small.
You can use poly-fill to 'fool' the sub into behave as if it were surrounded by a bigger box.
Pollyfil is a sound incorporation, dampening fiber that will deepen bass, provide cleaner midrange, tone down any unwanted reverberation and improve the dynamic extension of any speaker system.
It also help eliminate standing breakers, which is something like an ring inside the box. This will give you tighter and more accurate bass. It also help to give a flatter frequency response to the overall nouns, which is good. Besides this, it also help reduce the convulsion of the box, which results in smaller quantity distortion. There is a big difference to the bass when you have an insulated box.
Damping also increases subwoofer use by dissipating some energy that affects the sub, principally the voice coil.
Pillow polyfill and fiberglass insulation are common, though polyfill is seriously easier on your skin. Polyfill also "tricks" a sub into thinking it is in a bigger box. Most hermetically sealed and vented enclosure require 1/2 lb. of dampening material per cubic foot of internal compound space. For best results it is recommended to loosely fill the bits and pieces throughout the enclosure.
It can be found at Wal-Mart surrounded by the craft section. It's matching stuff used for pillows or quilts. Sometimes called bat.
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