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Advantage: Easy to build. Smaller enclosure size, lean tight sounding bass, better power handling vs. ported design and linear low bass extension.
Disadvantage: Less efficient as compared to ported design.
Ported Enclosure (Bass Reflex):
Advantage: More output at the tuning frequency as comparered to the same woofer in a sealed enclosure. Higher efficiency.
Disadvantage: Larger enclosure size, calculating enclosure and port dimensions more difficult, easy to blow woofer if power handling limit is exceeded.
Bandpass Enclosure (4th Order):
Advantage: Bandpass can be designed to play loud or low depending on your needs, by design produce a limited band with, the woofer cone does not move as much as other designs reducing the chance of added distortion.
Disadvantage: Bandpass boxes have a tendency to sound boomy not tight, typically these enclosures don’t sound as good reproducing music requiring great detail such as jazz or classical music.
It is recommended to build your enclosure from 3/4″ thick MDF (medium density fiberboard). Make sure the enclosure is sealed air tight.
Calculating External Enclosure Volume
To calculate box volume, measure the outside width X height X depth of enclosure.
Next, you must convert cubic inches into cubic feet. To do this, you must divide the cubic inch total by 1728″.
Calculating Internal Enclosure Volume
To calculate the internal (net) volume of the above box, you must first multiply the thickness of the wood you are using by two (2).
Next, subtract 1.5 from each of the outside measurements of the box.
Multiply the new totals (W X H X D)
Finally, you must convert cubic inches into cubic feet. to do this, you must divide the cubic inch total by 1728^