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Dayton Audio SD315-PR 12" Passive Radiator
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
Will this work with the RSS315HO 12"? I am a little concerned as the xmax is of the passive radiator is less than the subs.
I would not recommend using this for the Reference subs, they will not support the displacement required.
Date published: 2015-02-02
T/S parameters of my old 12" Sub driver: Qts 0.282 Qes 0.305 Qms 3.780 Fs 19hz Res 3.70Ω Ls 2.38mH Lp 3.51mH Rp 2.99Ω Dia 240mm Vas 132l mms 153g cms 460um/N bl 15.4T*m Spl 86.9dB. Will 2 or 3 PR in 3cf cabinet with 500W plate amp works?
I would recommend two passive, with 150 grams added to each. This will tune the enclosure to 27 Hz. A 500 watt plate amp should be plenty, but without knowing the power handling or Xmax of the woofer it is impossible to say.
Date published: 2015-01-19
I have a dayton ultimax 18 in my trunk in a sealed box, the volume is 3.8 cubes total and around 3.3 minus sub and bracing displacement. Would adding 3 of these make the sub sound deeper and bring out the full potential of the ultimax?
Unfortunately no, these passive radiators will not have enough displacement capability to work with a woofer that large. The only passive we have that would be compatible would be the TC Sounds VMP 18", part number 293-684. Although, modeling this setup shows that it is still not a great match, the volume is just too small to add a port or passive radiator with that woofer. You will actually have more extension keeping it sealed, and you will have less excursion issues.
Date published: 2015-02-26