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I was planning on installing a 12" sub in the ceiling/attic and came across the "infinite baffle" concept.
The definition mentions that "The space behind the baffle is generally very large"

Question: Why is the "box" needed ? wont it be more efficient for the diaphragm to direct sound waves down into the room directly instead of reflecting it inside the box ?

Sample image credit: http://ibsubwoofers.x10host.com


Thanks for reading.
 

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One 12” sub will not be enough for IB usually you have 4 15” subs at a minimum for a decent IB.


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If you're serious about an IB; you should Google Cult of the Infinite Baffled.



Typed on a tiny keyboard, excuse any typos
 

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The "box" serves a couple of functions. Probably the most important is as stated it allows you to mount a pair of drivers facing one another (or two opposed pairs on the four sides of the cube) such that their mechanical vibrations cancel. This is quite important as the ceiling rafters in these installs are generally not sized for loads above and thus flex relatively easy when driven "up and down". You don't want your whole ceiling resonating, or rattling, or both.

Another reason is that some ceilings are framed with rafters every 16", and many people use 18" subs for IB. Not ideal trying to figure our how to mount an 18" speaker in a
 

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The "box" serves a couple of functions. Probably the most important is as stated it allows you to mount a pair of drivers facing one another (or two opposed pairs on the four sides of the cube) such that their mechanical vibrations cancel. This is quite important as the ceiling rafters in these installs are generally not sized for loads above and thus flex relatively easy when driven "up and down". You don't want your whole ceiling resonating, or rattling, or both.

Another reason is that some ceilings are framed with rafters every 16", and many people use 18" subs for IB. Not ideal trying to figure our how to mount an 18" speaker in a
 
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