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post #1 of 96 Old 10-18-2019, 08:50 AM - Thread Starter
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Most economical way to 7hz

My room is 21 x 23 x 8. Enclosure size is no issue however money is. I am trying to replicate the schumann resonance for some experiments. I was thinking about a 45 cubic foot sealed enclosure with 22 of those jbls when they go back on sale. Any suggestions would be appreciated.
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post #2 of 96 Old 10-18-2019, 09:00 AM
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Quote:
Originally Posted by fj6474 View Post
My room is 21 x 23 x 8. Enclosure size is no issue however money is. I am trying to replicate the schumann resonance for some experiments. I was thinking about a 45 cubic foot sealed enclosure with 22 of those jbls when they go back on sale. Any suggestions would be appreciated.
How loud does it have to play?
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post #3 of 96 Old 10-18-2019, 09:11 AM
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You require 7Hz and money is an issue...good luck.

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post #4 of 96 Old 10-18-2019, 09:12 AM
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This is a trap. I will not help you with your doomsday machine.
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post #5 of 96 Old 10-18-2019, 09:13 AM
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Why do you need specifically 7 hz?

Leave it at 8 ohms and call it a day :)
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post #6 of 96 Old 10-18-2019, 09:15 AM
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Quote:
Originally Posted by Russdawg1 View Post
Why do you need specifically 7 hz?
https://en.wikipedia.org/wiki/Schumann_resonances

Looks like 7.83 Hz, specifically.

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post #7 of 96 Old 10-18-2019, 09:17 AM
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Infinite baffle isn’t all that expensive. You just have to have the “right room” for it.
I was able to get down to single digits easily with 4x18”
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post #8 of 96 Old 10-18-2019, 09:18 AM
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Quote:
Originally Posted by Russdawg1 View Post
Why do you need specifically 7 hz?
Irene scene on repeat all day duh!!
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post #9 of 96 Old 10-18-2019, 09:19 AM
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Originally Posted by GatoGoat View Post
Irene scene on repeat all day duh!!
Is there anything I should know before Googling this? Am at work.

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post #10 of 96 Old 10-18-2019, 09:19 AM
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Do a ported "IB" and tune it at 7Hz. Any space 200cf+ for this would work really well.

16 JBLs in this sort of alignment will outperform 64 JBLs in a regular IB at 7Hz.
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post #11 of 96 Old 10-18-2019, 09:19 AM
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Quote:
Originally Posted by jevchance View Post
https://en.wikipedia.org/wiki/Schumann_resonances



Looks like 7.83 Hz, specifically.

Completely missed that.

I’m surprised that no one has maid the comment that most subs can play 7hz, just not that loudly :P

Leave it at 8 ohms and call it a day :)
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post #12 of 96 Old 10-18-2019, 09:21 AM
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Quote:
Originally Posted by jevchance View Post
Is there anything I should know before Googling this? Am at work.
Yeah , you need 7hz on your computer speakers lol...
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post #13 of 96 Old 10-18-2019, 09:22 AM
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Originally Posted by GatoGoat View Post
Yeah , you need 7hz on your computer speakers lol...
LOL is it the scene from Sherlock Holmes? Apparently my headphones have failed the test.

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post #14 of 96 Old 10-18-2019, 09:25 AM
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Originally Posted by jevchance View Post
LOL is it the scene from Sherlock Holmes? Apparently my headphones have failed the test.
Nah...Black Hawk Down , F-in Irene Scene....Make sure you spell Hawk correctly if you are at work
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post #15 of 96 Old 10-18-2019, 09:25 AM
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Quote:
Originally Posted by jevchance View Post
LOL is it the scene from Sherlock Holmes? Apparently my headphones have failed the test.

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post #16 of 96 Old 10-18-2019, 09:31 AM
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post #17 of 96 Old 10-18-2019, 09:46 AM
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Single digits are not cheap, if you have a lot of space to work with for woofers I would attack it with cone area. Think 20+ PA460s, that is about as cheap as you can get.

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post #18 of 96 Old 10-18-2019, 09:55 AM
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Quote:
Originally Posted by Russdawg1 View Post
Completely missed that.

I’m surprised that no one has maid the comment that most subs can play 7hz, just not that loudly :P
See the second post of the thread.

Quote:
Originally Posted by johnson636 View Post
You require 7Hz and money is an issue...good luck.
Depends on the experiment. He could potentially do it in a very small space at a reasonable volume. With reasonably powerful drivers in a sealed box he could apply boost. I mean even a storage closet with concrete walls, stack sealed subwoofers in there and apply boost.

I spent quite a bit of time in research and sometimes just by scaling things down your economics get a lot better. Also making sure the room is quiet, turn off the A/C, do it very late at night, seal the door for the experiment... then you get some free headroom by lowering the noise floor.
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post #19 of 96 Old 10-18-2019, 09:59 AM
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Quote:
Originally Posted by anjunadeep View Post
See the second post of the thread.



Hidden in plain sight!

Leave it at 8 ohms and call it a day :)
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post #20 of 96 Old 10-18-2019, 10:49 AM
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I'm using 12 of the JBL's for IB and can confirm they work just fine.
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post #21 of 96 Old 10-19-2019, 03:42 PM
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SPL at a given frequency for sealed (or IB) alignment is a function of displacement. Therefore, for budget minded builds, displacement per dollar rules. Still hard to do better than Fi IB3-18 there. One, two, three, sixteen, however many you need to get to your desired output in a given room is about the cheapest way to do it... sealed. Unless you don't need as much output as a single IB3-18 can provide, then look at cheaper subs. Keep in mind though that for any sealed design, larger enclosure (up to it becomes an IB) means less power and thus less cost required for amplification.

Ported can get you there with less expense in drivers and a larger enclosure. Here it isn't just all about displacement per dollar (still important) as you need resonances to be compatible, and the amount of power required to get you there adds to cost as well.

I guess if space was truly unlimited an insanely large horn(s) tuned to 7Hz might be the least expensive way to get to a certain SPL, at least for driver and amplification. Wood isn't exactly peanuts and the cost becomes significant when looking at massive enclosures. May ultimately be cheaper to have a much smaller enclosure with more drivers, or use an IB design that has an effectively huge enclosure without much cost.
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post #22 of 96 Old 10-19-2019, 05:04 PM
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"I guess if space was truly unlimited an insanely large horn(s) tuned to 7Hz"

A Submaximus horn can be fitted with a 24" . . .
The cab would be 120 ft^3,
this idea explored by @hd0823 with @LTD02 ,
the tuning was never expounded upon
but inquiring minds might like to know
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post #23 of 96 Old 10-19-2019, 05:11 PM
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Quote:
Originally Posted by asarose247 View Post
"I guess if space was truly unlimited an insanely large horn(s) tuned to 7Hz"



A Submaximus horn can be fitted with a 24" . . .

The cab would be 120 ft^3,

this idea explored by @hd0823 with @LTD02 ,

the tuning was never expounded upon

but inquiring minds might like to know
I dont think we even got that far lok. I seen 120 cubic ft and chickened out lol

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post #24 of 96 Old 10-19-2019, 08:21 PM
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Quote:
Originally Posted by Mr. Electric Wiz View Post
Infinite baffle isn’t all that expensive. You just have to have the “right room” for it.
I was able to get down to single digits easily with 4x18”
Same here!

Running an IB setup with 4-18” subs.

Room is 22 by 20 with 9’ ceilings and completely open on one side.
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post #25 of 96 Old 10-19-2019, 08:33 PM
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Best way is to build false walls and make the room smaller. Within those false walls can be your subs. Big enclosure, less amp power, smaller room, and bingo! You could port at 10hz even but I would keep it sealed depending on drivers.
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post #26 of 96 Old 10-19-2019, 09:24 PM
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Quote:
Originally Posted by Bigus View Post
...for budget minded builds, displacement per dollar rules. Still hard to do better than Fi IB3-18 there.

Better than x number of 12" $29 JBL's?

Noah
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post #27 of 96 Old 10-19-2019, 09:38 PM
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Originally Posted by noah katz View Post
Better than x number of 12" $29 JBL's?
Nah, the JBLs win even at $40 per.

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post #28 of 96 Old 10-19-2019, 09:47 PM
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Are they even available anymore?

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post #29 of 96 Old 10-19-2019, 09:51 PM
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Quote:
Originally Posted by noah katz View Post
Better than x number of 12" $29 JBL's?
Seems like I did that math. At $29 maybe better but would run into practical mounting area constraints for ambitious builds. Tha pa460 is about even but takes 3 to 1 so again mounting issues may become important.
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post #30 of 96 Old 10-19-2019, 10:04 PM
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And yeah, even at $40 still just edges out. Definitely a difference in accommodating 8 x 18" subs vs 50 x 12" subs. All depends on what one thinks is reasonable. A 4 x 18" IB build isn't that uncommon. 24 x 12" manifolds might be just within reason, 12 per manifold with a "sub that shook the world" 3 deep all 4 sides construction. Then again, a few around here have more than 8 x 18" IB's. Hmm... 16 x 18" is crazy. 100 x 12" is beyond crazy.
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