passive radiator on any sub??no right - Realm of Excursion



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Old 04-26-2008   #1 (permalink)
 
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Default passive radiator on any sub??no right

has anyone ever used a passive on any sub??i know that usually you only use same brand with sub but has anyone ever mixed em up??just wondering
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Old 04-26-2008   #2 (permalink)
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i do not think it is necessary to have one for a subwoofer. i have 2 good powerplant 12s and 2 junk powerplant 12s i was thinking about usin the 2 junk ones and turn them into passive radiators. but i did a little research on it and realized that the passive radiator just produces lower freq. then what the Speaker produces, but in the case of a subwoofer it already produces low freq. plus from what i understand most subwoofers produces frequencies lower then what you can hear anyways to theirs no point in producing ones any lower. also a passive radiator is not just a cone to a speaker its actully has a weight on it. why? im not quit for sure maybe to make it a little harder to move i dont know, im not a expert on this just telling you what i think.
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Old 04-26-2008   #3 (permalink)
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Sure you can mix it up.

Most subwoofer manufacturers don't also offer a passive radiator option, so you have to find them from parts express or elsewhere.

Think of a passive radiator setup as a ported box that falls off more sharply below tuning frequency and needs a smaller box.
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wow i actually didnt know that....thanks for the input on this subject...also how would i come up with a box using this??
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Old 04-26-2008   #5 (permalink)
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A passive radiator is used to tune a sealed box. It's more than just a basket and a cone.
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Old 04-26-2008   #6 (permalink)
 
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and normally you need around double the area in radiator than subwoofer to start with. I did a passive radiator setup with some TC Sounds radiators, and they work well, since they're tunable by changing out weights.
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Old 04-26-2008   #7 (permalink)
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Quote:
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A passive radiator is used to tune a sealed box.
I never thought about that analogy, but yes thats a great way to think of it also.
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yeah i know a little but say if i were to use my critical mass in this set up and wanted to tune lowwhat should i do about getting the right stuff and size box?thanks for yalls help this is what makes realm, realm...
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Old 04-27-2008   #9 (permalink)
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I'm not sure where all the misconceptions about pr's comes from. a pr is the same as a port it is another radiating mass used to compliment the front wave of the powered driver by tuning its mass. a port uses the compressed air in the box as a complimentary driver by exchanging a column of air at a given resistance in and out. where with a pr the port volume is traded for cone mass. there are allot of arguments over weather or not a pr can be as loud or efficient as a traditional port. i have used many pr's in home theater setups. I don't know why they have not been used more in Car audio. in car audio space is almost always at a premium. with a pr the "port" takes up almost no space and you have the added convenience of changing the tuning freq in minutes by adding or removing weights on the cone. I would love to experiment in a car with this but I have not as yet.


Stratus do you still have yours?? are you interested in selling them??
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Old 04-28-2008   #10 (permalink)
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Sure you can mix it up.

Most subwoofer manufacturers don't also offer a passive radiator option, so you have to find them from parts express or elsewhere.

Think of a passive radiator setup as a ported box that falls off more sharply below tuning frequency and needs a smaller box.
Agreed.

Keep in mind they should only be used with subs that work well ported. Don't use a passive with a sub that has a qts of .7 lol...it'll sound like ****.

I make my own passive out of dead subs(or living ones that need to be sacrificed)

Make sure you tune it right, just throwing a passive in a box won't work as well as it could.
WinISD can help you with tuning.



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