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Re: what is the cubic feet needed to build box for...
You can use this speaker in either a ported or sealed box. A sealed box would be smaller, (sealed box volume: 0.5 to 1.25 cubic feet) the larger the box the more base you will get. With a sealed box your amp has to work double hard as it would in a ported box ( 1.3 to 3.2 cubic feet) You will get close to double the volume in a ported box. Tuning a ported box with the size and length of the port will determine the hertz the speaker will play at.
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It depends on the size of the subs- 8z 10z 12z 15z? whether or not you port the box is up to you- a ported box is generally louder than a sealed box -as you are coupling and tuning the sound from the rear of the driver with the sound generated from the front of the sub- but the box is also generally larger as well.Then aside from your preference of ported/sealed you have to account for the recommendations of the manufacturer as to whether the sub/speakers are meant to be placed in a ported or sealed enclosure. Most 10 inch subs do well in a box that yields .75 cubic feet to1.0 cubic feet.most 12z do well in 1.0 cu feet to 1.5 subic feet and 15z do well in 1.5 to 2.5 cubic feet. I have a set of 15z that require 4.25 cubic feet per sub-so its important to look into the manufacturers recommendations. The easiest box to make would be a sealed enclosure-and the sound quality generally yields a tighter more accurate bass sound along with increased power handling capability- try going to rockford fosgate .com and look into the woofer box wizard its a program that calculates air space for whatever size box you have room for-hope that helps you-good luck