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Date: August 22, 2001 at 17:23:41
From: Rory, [tc3-009.dip.iei.net]
Subject: Re: a wOOx type deal... |
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Again, this is all caused by people refusing to think outside the box. A PR is like a port, in that it has Mms. But it can also behave like a volume of air in that it has Vas. It is this Vas that I am looking at. I have a hypothesis that the wOOx-Slave is a plastic center piece, suspended by a spider inside that fancy double suspenion. The spider gives the lightweight membrane a certain Vas. The wOOx-Slave is lightweight so that it does not affect the box tuning. Rather, hypothetically, it represents a volume of air equivalent to that of the Vas parameter. As you know the Vas parameter is the stiffness of a driver's (or PR's) suspension.
The thing that tipped me off to this hypothesis of the PR representing a mass of air, rather than an air mass in a tuned port was a comment posted to the Circuit City website regarding a wOOx system. It was said that "the little woofers on top have far too much travel for the amount of bass they put out." And the reason it isn't just like another tuned port is that it takes less air pressure to move the mass of air that is in the tuned port than it does to move the passive radiator. The wOOx radiator would simply behave like another box wall.
Another possibility is that the wOOx-slave may have a resonance frequency within the passband of the speaker. This, theoretically, would result in a large amount of PR excursion. Then the wOOx Dynamic Amplification Control amplifies the frequencies that excite the wOOx radiator.
But I'm fairly certain that it isn't just like another tuned port.
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Posted with TalkShop version
2.71-8 BETA |
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