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Dayton Audio SD315-PR 12" Passive Radiator
I am considering using this (instead of porting) with a RSS210HO. Will it work well for this application? And if so what weight ballast would be recommended in the recommended ported box volume (1.68) to achieve the 27hz fs?
The ported volume on the site is actually not accurate and I will have this fixed. The recommended volume for this woofer using a passive is 1 cubic foot. With 200 grams added you will have a tuning frequency of 30 Hz and in room response into the mid 20's.
Date published: 2015-05-20
I have a JBL GTS-15 SUB in a box with 3.0 cu. in. (OEM 3.5) 10.5X25.5X19.5 air space. will two 12in passive radiators quiet the sub down and increase the low end (vibrates/unstable) Any reccommendatios or ideas appreciated. Should I go with a 18in PR?
I would not recommend adding a passive radiator or port of any kind to this enclosure. The recommended sealed volume is 5 cubic feet, the recommended passive or ported volume is almost 11 cubic feet. Adding a passive will not really benefit you at all here, probably only hurting more than helping. That woofer works very well in a sealed alignment so as long as it is getting clean power you shouldn't have any issues.
Date published: 2015-05-19
What is the limit for the added mass on this passive radiator?
We recommend no more than doubling the Mms on these passives.
Date published: 2015-05-05
I'd like to add one of these to reinforce the low frequencies from my Eminence Beta 12a-IIs (290-408) in a sort of Econowave setup (4.75cu. ft.). Any concerns about matching these up with a pro driver? Any issues with rear-firing it, relative to the Beta?
The problem with using a passive radiator in this volume (relative to woofer size) is you cannot tune one high enough. Passives are designed for enclosures that are too small to properly fit a port. With a 4.75 cubic foot enclosure you can help the bottom end by simply adding a small port. A 4" diameter, 1" long port will provide a tuning frequency of 38 Hz.
Date published: 2015-04-23
Have a Dayton Audio ST385-8 15" Series II Woofer in sealed cabinet (13.3 cu. ft.). Building a cabinet for low organ sounds - down to 16 hz. The speaker seems to be trying to do it. Would adding two of these radiators help?
Unfortunately no, you would need two 15" passives in order to handle the displacement of the woofer. In that volume however you really only need to port the cabinet, passive radiators are not required in a volume that large. Two 4" diameter ports that are 15" long will tune the enclosure to 17 Hz. You will also lose some power handling capability so keep an eye on the cone excursion in order not to damage the driver at higher volume levels.
Date published: 2015-04-14
What is the displacement of these PR's? Do I need to take their displacement into consideration when I build the box they're going in or just build my box the spec and slap them in there?
These will displace so little it will not matter in the total volume of the enclosure.
Date published: 2015-02-11