what exactly are these used for?

[HincklNutt 10+ year member]

http://www.acoustic-visions.com/~acoustic/products/subwoofer_drivers/adire_pr15/

passive radiator's? what do they do?

thanks for the help

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[BASS OUTLAW 10+ year member]

A passive radiator box functions much like a vented box because its passive drone cone behaves similarly to a vent.

 

[Scarenius 10+ year member]

Think ported box, only easier. Say you have a box for 2 subs with shared volume, and you unplug one sub, the other one will, for some reason, pound a lot harder than it used to.

Don't buy a passive radiator like that, unless you plan on doing the math to go with. Instead, get a Legacy / Pyramid / Boss sub the right size, the cheaper the better, and just take out the driver.

 

[JimJ 5,000+ posts]

PR's are used for enclosures when the calculated port length would get impossibly huge, say for very low tunings...not very commonly used for in-car setups, you'd tune too low for practical use.

 

[HincklNutt 10+ year member]

thanks for the help. im not going to be using one, i just thoght it was interesting so i figured id find out what they where