Passive radiator question

[mcsoul 10+ year member]

Does the passive radiator need to "unload" into the cabin?

In other words, lets say I had 2 or three Boston g5's running sealed

and walled off in a trunk car. The g5's obviously unload directly into

the cabin, but are sealed off from the rear of the enclosure. For the

sake of argument, each sub has it's own 1 cubic foot of air space.

Now lets say I add the required compliment (2 or 3) passive radiators to

the back of the sealed enclosure, remember, the back is walled off from the

cabin.

Now will this setup get the full benefit of the passive radiators, partial benefit

or no benefit?

This is more of a conceptual question to help me understand the mechanics of

the passive radiator. I'm not really thinking of doing this.

Also, for bonus points (jk), if you know; can the passive radiator unload into

almost no airspace, say firing into a sealed off spare tire well with no escape

of air and very little air space to load against outside of the box?

-thanks

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[dcole18 5,000+ posts]

it can unload anywhere... doensnt need to be in the cabin

 

[mrogowski 5,000+ posts]

Does the passive radiator need to "unload" into the cabin?
In other words, lets say I had 2 or three Boston g5's running sealed

and walled off in a trunk car. The g5's obviously unload directly into

the cabin, but are sealed off from the rear of the enclosure. For the

sake of argument, each sub has it's own 1 cubic foot of air space.

Now lets say I add the required compliment (2 or 3) passive radiators to

the back of the sealed enclosure, remember, the back is walled off from the

cabin.

Now will this setup get the full benefit of the passive radiators, partial benefit

or no benefit?

This is more of a conceptual question to help me understand the mechanics of

the passive radiator. I'm not really thinking of doing this.

Also, for bonus points (jk), if you know; can the passive radiator unload into

almost no airspace, say firing into a sealed off spare tire well with no escape

of air and very little air space to load against outside of the box?

-thanks

It's simply actually. A passive takes the place of a port, so your install options are just like a bass reflex design. Now, ask yourself if placing a port in those locations will benefit you?

Best,

Mark

 

[grimreper912003 5,000+ posts]

it can unload anywhere... doensnt need to be in the cabin

How would that help? Persay its unloading into a sparetire well, wouldnt that just change the pressure inside of the box? does the passive radiator work by helping the sub travel further in a sealed box?

 

[mcsoul 10+ year member]

It's simply actually. A passive takes the place of a port, so your install options are just like a bass reflex design. Now, ask yourself if placing a port in those locations will benefit you?
Best,

Mark

So your saying that the passive basically acts like a port. The conditions I gave

would be very adverse (bad) in a ported configuration. So the Passive radiator

creates it's own sound wave similar to a port and therefor needs a nice wide

path to the listening area. Correct?

This is basically the opposite of what Dcole18 said though.

 

[Forrest Gump 10+ year member]

P.R. is just like a port from what I've read

 

[NeedDirections 10+ year member]

i would trust virtually any answer google provides over one garnered from this forum.

 

[newusername 10+ year member]

Yes, a PR behaves in a very similar manner to that of a port. The PR's output is summed with the driver's output, so the positioning of the PR must be done so as to maximize the summed output. There is no real reason to have the PR oriented so that none of its output enters the listening area.

 

[Tinted 10+ year member]

passive rad = port.

 

[wu501 10+ year member]

I don't think you would hear any difference in your particular situation.