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Message: <blockquote data-quote="454Casull" data-source="post: 453091" data-attributes="member: 553977">A passive radiator setup has a higher group delay than a vented system.  Passive radiators are usually used when ports would be impossible or inconvenient to use  - i.e. when the port length would be too long, or when the port air velocity would be too high (chuffing would result).You get about as much cancellation from a passive radiator as you do from a vent; as you approach the tuning frequency from the higher frequencies, excursion of the driver(s) goes lower and lower since the passive radiator/vent does more of the work, and then it goes higher and higher since you get cancellation from the PR/vent.</blockquote>

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