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RE: Sub Woofers - ported vs Sealed? Active or not?




Hi
I am not sure you understood, IF you CAN take advantage of the pressurization zone, that has been said to be the only free lunch in Audio.

I could not find my set of curves for a number of rooms, but did find one for cars.
What you see is the measured response inside a car with windows up, using a speaker that IS actually flat. Once one is below the lowest room mode, then the room containment causes the pressure to rise as much as +12dB/oct.

A sealed box has a -12dB/oct roll off (constant excursion with falling F) so what i was suggesting is that IF one can make a sealed alignment with the compliment of the room gain slope, then the room gain off sets the speaker's natural roll off. This can give an octave or more "for free" bass extension.

This is possible with the help of eq to get the right response shape but can't be done with a vented box because of it's "self cancellation" below port tuning f resulting in a sharper fall off and decreasing cone control below that point.
Tom Danley



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  • RE: Sub Woofers - ported vs Sealed? Active or not? - tomservo 08/3/2407:47:01 08/3/24 (0)

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