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Are Subs With Passive Radiators More Like Vented or More Like Sealed?

post #1 of 27
6/2/12 at 2:03pm
Thread Starter 
I have seen subwoofers with passive radiators described as sealed and other subs with passive radiators described as vented.

In the Passive Radiator FAQ from Acoustic Elegance they make this statement:

"You typically only want to use a passive radiator along with a woofer that is designed for a vented enclosure. A passive radiator enclosure is NOT a sealed box enclosure. You will typically want to use a lower Q woofer with a PR system. This means a woofer with Qts of .4 or lower."

That brings me to my question: Is a subwoofer with a passive radiator more like vented, or more like sealed?
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post #2 of 27
6/2/12 at 2:37pm
passive radiator subs are "bass reflex" loaded just like a ported box. like a port, the pr's are tuned resonate at a certain frequency just like a port

they also have a steep roll-off below tune like a port

i would say pr's are nothing like sealed
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post #3 of 27
6/2/12 at 2:58pm
Quote:
Originally Posted by spyboy View Post

I have seen subwoofers with passive radiators described as sealed and other subs with passive radiators described as vented.

In the Passive Radiator FAQ from Acoustic Elegance they make this statement:

"You typically only want to use a passive radiator along with a woofer that is designed for a vented enclosure. A passive radiator enclosure is NOT a sealed box enclosure. You will typically want to use a lower Q woofer with a PR system. This means a woofer with Qts of .4 or lower."

That brings me to my question: Is a subwoofer with a passive radiator more like vented, or more like sealed?

spyboy, you already knew this answer

This post deserves a "common man"
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post #4 of 27
6/2/12 at 3:09pm
wut
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post #5 of 27
6/2/12 at 4:45pm
Hey, he's just trying to stimulate conversation with this thread.

vardo
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post #6 of 27
6/2/12 at 5:00pm
Quote:
Originally Posted by KyleLee View Post

spyboy, you already knew this answer

This post deserves a "common man"

A "common man" or a "C'mon Man!" ???

Craig
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post #7 of 27
6/2/12 at 5:22pm
Quote:
Originally Posted by craig john View Post

A "common man" or a "C'mon Man!" ???

Craig

Play "Fanfare For The C'mon Man"?
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post #8 of 27
6/2/12 at 5:24pm
decoder ring please
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post #9 of 27
6/2/12 at 5:35pm
Quote:
Originally Posted by otk View Post

decoder ring please

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post #10 of 27
6/2/12 at 5:57pm
Thank you.
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post #11 of 27
6/2/12 at 7:28pm
Quote:
Originally Posted by otk View Post

Thank you.

Sir! Here to help, sir!
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post #12 of 27
6/2/12 at 8:57pm
Quote:
Originally Posted by vraxoin View Post

Sir! Here to help, sir!

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post #13 of 27
6/2/12 at 11:17pm
You should ask Siri.
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post #14 of 27
6/3/12 at 1:27am
Drone cone?
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post #15 of 27
6/3/12 at 5:11am
words don't matter. it's all about the measurements
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post #16 of 27
6/3/12 at 5:30am
Quote:
Originally Posted by otk View Post

words don't matter. it's all about the measurements

Measurement is a word, so measurements don't matter either.
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post #17 of 27
6/3/12 at 5:35am
Quote:
Originally Posted by mojomike View Post

Measurement is a word, so measurements don't matter either.

and who was the first person to realize that measurements can tell us a sub sounds good. are we to trust his ears ? maybe he was listening to "the room"


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post #18 of 27
6/3/12 at 10:04am
So a hipass is manditory like a ported sub.....
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post #19 of 27
6/3/12 at 8:42pm
Quote:
Originally Posted by otk View Post

and who was the first person to realize that measurements can tell us a sub sounds good. are we to trust his ears ? maybe he was listening to "the room"



If he's measuring and listening indoors, who cares about his ears, or his measurements? If he's measuring and listening indoors, he's only measuring, and hearing, his room... interesting, but meaningless for the rest of us.

Craig
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post #20 of 27
6/4/12 at 5:03am
and if the sub was measured outdoors, how do we know if it sounds good indoors ?

people could save a lot of money by just papering their walls with measurements and looking at them during an explosion scene

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post #21 of 27
6/4/12 at 6:08am
Quote:
Originally Posted by otk View Post

and if the sub was measured outdoors, how do we know if it sounds good indoors ?

people could save a lot of money by just papering their walls with measurements and looking at them during an explosion scene


Hahahahah, i like it.... Wallpaper subwoofer graphs
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post #22 of 27
6/4/12 at 7:01am
Quote:
Originally Posted by kgveteran View Post

Hahahahah, i like it.... Wallpaper subwoofer graphs

just make sure you don't block the acoustical treatments with them
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post #23 of 27
6/4/12 at 12:50pm
Thread Starter 
So all kidding aside, what would you say to someone who describes a subwoofer with a passive radiator as being an "acoustic suspension" design?
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post #24 of 27
6/4/12 at 1:07pm
Quote:
Originally Posted by spyboy View Post

So all kidding aside, what would you say to someone who describes a subwoofer with a passive radiator as being an "acoustic suspension" design?

Well, isn't it?
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post #25 of 27
6/4/12 at 1:20pm
Quote:
Originally Posted by spyboy View Post

So all kidding aside, what would you say to someone who describes a subwoofer with a passive radiator as being an "acoustic suspension" design?

I would say they don't know what they are talking about?

To me, passive radiator designs do combine the two best things about each alignment.

1) you get the deep bass boost inherent in a vented design
2) you get the close box of a sealed design (so spiders and toys don't end up nesting in your sub.....both happened to me)
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post #26 of 27
6/7/12 at 11:23am
Quote:
Originally Posted by warpdrive View Post



To me, passive radiator designs do combine the two best things about each alignment.


1) you get the deep bass boost inherent in a vented design


Don't forget higher efficiency. wink.gif

Quote:
2) you get the close box of a sealed design (so spiders and toys don't end up nesting in your sub.....both happened to me


Spider proof. Works for me!


Ian biggrin.gif
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post #27 of 27
6/7/12 at 11:40am
Quote:
Originally Posted by spyboy View Post

So all kidding aside, what would you say to someone who describes a subwoofer with a passive radiator as being an "acoustic suspension" design?

show him or her the measurements
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