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I apologize for not being able to find a simple explanation for this question. So, here it does:

If a manufacturer recommends a 1ft3 sealed enclosure for a 6" mid/bass driver, what will be the effect of using a 0.8 ft3 sealed enclosure instead? What would one hear if using a 1.2 ft3 enclosure?

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If a manufacturer recommends a 1ft3 sealed enclosure for a 6" mid/bass driver, what will be the effect of using a 0.8 ft3 sealed enclosure instead? What would one hear if using a 1.2 ft3 enclosure?
Generally speaking a too small box results in a loss of low end with a response hump higher up in the pass band. A too large box gives more low end extension but with a sensitivity loss higher up in the pass band. In any event never take a manufacturer's word for what size enclosure to use, model it yourself and you'll know what you'll get.
 

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As you reduce volume the Q of a loudspeaker system increases, the F3 increases, the rolloff steepens and there is often a peak in response. Look at the graph below:



Q=0.707 (black dotted line) is often referred to as maximally flat, i.e. the lowest F3 you can get for that enclosure.
 
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