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Dayton Audio SD215-PR 8" Passive Radiator
how do you design a sub box to use a passive radiator?
how do you know what size passive radiator to use?
Generally, you need twice as much displacement from the PRs as you have from the woofer/subwoofer that is driving them. So, if you have an 8" woofer with 6mm of excursion, then (generally) you'll need at least two 8" PRs with at least 6mm of excursion. If the PRs are any significant amount smaller than that then they will probably bottom out, which will sound bad and possibly destroy the PRs. If they are a bit bigger, that should be ok.However, the above is just a generalization, and to actually build a PR box properly there are many more steps. Generally this is how I do it:1. Choose the woofer/subwoofer I want to use2. Pick a few possible PRs to use. For each PR:a) Enter the woofer/subwoofer's specs and the PR's specs into a speaker design program that supports simulating PR boxes. One such program that is easy to use, is free, and which I use all the time is WinISD Pro (it has to be the "Pro" version. The basic version does not support PR boxes).b) If the program you use is able to calculate an optimal design for the given driver and PRs then great, but WinISD can't do that. So instead I have to manually play around with the parameters. First I usually set the box size to something that is typical of a ported box for the given woofer/subwoofer (because ported boxes are very similar to PR boxes, so the internal volume will be similar). Then I adjust how many PRs I have and the amount of mass on each one, and adjust the box size some more if necessary.c) When configuring the box, there are several parameters to optimize. Obviously, the frequency response should be as flat as possible, like with all boxes. Also, you must make sure that the woofer/subwoofer AND the PRs are within their excursion limits at ALL frequencies (even below 20Hz). When doing this, make sure the power level you are simulating in the program is the maximum power level that you'll likely use the speaker at (most programs set the default simulated power level to 1W or something similar, so you'll have to change this).3. After simulating all the PRs, I figure out which PR works best with the particular woofer and go with it.That should get you off to a good start.
Date published: 2014-04-01
cut out diameter
What is the cut out diameter for the 295-492 passive radiator? Thanks
Most speakers at Parts Express have a "B" dimension listed within their specifications. The cutout required for this passive radiator is 7-1/8".
Date published: 2011-02-27
Does it come with weights or should I just go to home Depot?
This series of passive radiators features an M5 threaded insert. No hardware is provided to tune the radiator. Customers typically buy an M5 bolt from a hardware store and use washers to add weight.
Date published: 2013-12-28
i have a 12 inch sub for my home audio system its good but its not getting enough bass for my taste i was wondering if i could add this to the box
if not what can i do to make it better i dont know much about pr so plez explane if the simplest way possible
There is no simple answer to this question. When you say, "not enough bass" are you referring to volume or "feel" or to how low the bass notes go? If the overall quality of your bass is what you want and you want to add a little more "feel" or amplitude to the bass, this passive radiator may be just what you need. Don't look for major changes however. Passive radiators can only add a little to what you already have. Whether or not you add a passive radiator, I would also recommend experimenting with speaker placement (try a corner front-facing and then rear-facing) and your crossover frequency (try setting it higher), these can be important factors. Good luck!
Date published: 2013-03-24
this is in regards to my other quistion about mt 12 inch sub
OK what i ment by not enough bass i can fell the bass as much as i would like i would like to have and the box i have is a custom box and its about 2 and a half felt long and 13 inches wide with a mounting depth of about 10 inches these are not exact but give or take a couple inches the sub is 500max and 125 rms i was thinking about getting another 12 inch but i cant fine a cheap one that i get as close on the watts for it and the box is ported idk what it is tuned at i got it from a friend if u know a way to find out let me know
If you could post the brand and model of your speaker and the exact measurements of the enclosure (including wood thickness) and the exact size and length of the port, I can probably give you the tuning frequency of your current enclosure.Honestly it doesn't sound like this is the answer to your question though. If what you have isn't giving you enough bass in any way, and you are using a 12" sub the passive isn't likely to really give you any real improvement in that direction.A rule of thumb with passives is to use twice the radiator size as the driver size which means two 12" passives for one 12" subwoofer. Even at that, you are going to "tune" them similarly to a port and your output is more likely to go down in terms of DB as opposed to a properly tuned ported enclosure.Bass amount is relevant to two things. Driver area and power. If you want a lot more bass than you have, your best bet is likely to be to purchase a better sub with a custom enclosure built for the driver and the room and/ or add more power to your setup. Give us some more details and we can probably make some comparisons for you.
Date published: 2013-03-24
this is the box mesurements and sube detials
ok the box use 1.5 cm thick wood i dk what kind the mounting depth it 10.5 inch and the port is 2.5 inch diameter and 4.5 inch long the box is 35.5 inch tall and 14 inch wide and 11 inch in length the sub i am use in the dual ds12 500watt max and 125 watts rms also i add a picture as well as a link to the sub and i know its not for home audio but i am on a relly tight budget
Without knowing what kind of amp will be used, or how the system is used, I would suggest a passive radiator of larger excursion and diameter for use with this 12" Dual sub. At least a 12" PR.
Date published: 2012-02-17