Compensating for small cabinent volumes using Aperiodic Vents. (1 Viewer)

[Brett DiMichele]

Hey Folks,
Before I get into this let me state that NO I am not even
considering this I am just curious "if this would work" then
why doesn't anyone use them?
Scan Speak makes Aperiodic Vents (Sp?) that I see listed in
Parts Express and from what I gather these can be used to
make a smaller sealed enclosure seem larger to the driver.
If this is the case why couldn't you build cabinents that
are say 1/2 the size of the displacement requirements and
then use the Vents to compensate for the lack of physical
displacement?
From what I also saw it looks like these vents have similar
install and useage issues as do Passive Radiators.
Just curious that's it...

 

[Greg Monfort]

An acoustically small cab for a given Fb raises F3 and lowers peak output at/around Fb, with the attendant high Q 'hump' in the response. It's this 'hump' that the Aperiodic loading flattens, further raising F3, leaving you with considerably less LF output as the tradeoff for the smaller Vb.
Not many 'free lunches' in sound reproduction. :frowning:
GM

 

[Brian Fellmeth]

Also, at best it will by no means double the apparent volume- more like about 30% increase which translates into about a 10% reduction in each linear dimension of the cabinet.