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Old Feb 13, 2003
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Sub box

hihi, i have a infinity kappa perfect 12", the manual said 1.00cu ft for best performance, but i built a 1.45 cu ft box, would this bring degrade my performace alot?thanx[IMG]i/expressions/face-icon-small-smile.gif[/IMG]
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Old Feb 13, 2003
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maybe..maybe not.. it will reduce power handling a little and may cause a little overhang. Otherwise you'll just have better low end response.

What you can do is stuff the box with polyfill up the wazooo. It'll take up a bit of space as will the woofers magnet and could improve it's low end extensin even more. [IMG]i/expressions/face-icon-small-smile.gif[/IMG] If it sounds "sloppy" or not how you like it. Just screw some leftover wood scraps inside the box to take up space.
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Old Feb 13, 2003
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doesnt polyfill make the subs think the box is bigger and not smaller?
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Old Feb 13, 2003
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Yes.. but only because of the resonance of the small fibers. It doesn't affect woofer overhang in any way. Just adds low low end acoustical reverberation (gain) stuffing with alot of it would fill volume and thus lessen overhang..if they is any
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Old Feb 13, 2003
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[hr]Originally posted by: macrossranma
would this bring degrade my performace alot?thanx[IMG]i/expressions/face-icon-small-smile.gif[/IMG][hr]
its built? try it and see if it does. still sounds awesome? nope, didnt degrade performance at all. cant tell if it degrades performance? then who cares?

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Old Feb 13, 2003
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whats overhang?
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Old Feb 13, 2003
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Overhang is cased by a lack of damping.

Damping figuratively is like elctronic/acoustical brakes. An amplifiers ability to cause a sub to stop and change directions. It's also a factoer with the size of the enclosure and the design of the woofer.

But a sub which suffers from overhang will sound very mushy and undetailed. The notes will all seem to blurb together. Basically sloppy bass.
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Old Feb 13, 2003
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the best i have ever heard a perfect 12 sound and loudest, was in a pressure loaded 6 cubic foot bandpass box, i think it was around 130 dB or so off of a fosgate power 250 bridged...
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Old Feb 15, 2003
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The larger the enclosure, the better the transient response...Once you go bigger than a QTC of .5, your box will basically act like a free air setup. Most manufacture box recomendations are for a QTC of around .9 so you should be fine. I don't know the specs of your sub, but I doubt being in an enclosure that size puts you at or under a QTC of .5...
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Old Feb 15, 2003
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[hr]Originally posted by: FaintReality
The larger the enclosure, the better the transient response...Once you go bigger than a QTC of .5, your box will basically act like a free air setup. Most manufacture box recomendations are for a QTC of around .9 so you should be fine. I don't know the specs of your sub, but I doubt being in an enclosure that size puts you at or under a QTC of .5...[hr]
maybe you should clear it up for the masses, i believe that only a small handful of us here know what QTC is...
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Old Feb 17, 2003
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the Kappa Perfect in 1.45 cubes depensing which model year will give ya a qtc of either .83 or .87.
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